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.. Author notes: this file is formatted with restructured text
(http://docutils.sourceforge.net/docs/user/rst/quickstart.html)
as it is included in Finagle's user's guide.
Note that ``RB_ID=#`` correspond to associated messages in commits.
6.x
-----
6.31.0
~~~~~~~
New Features
~~~~~~~~~~~~
* finagle-core: `c.t.f.Server` now has a `serveAndAnnounce` method that accepts a `SocketAddress`
as an address. ``RB_ID=758862``
* finagle-core: `c.t.f.service.Retries` now supports adding delay between each automatic retry.
This is configured via the `Retries.Budget`. ``RB_ID=768883``
* finagle-core: FailureAccrualFactory now uses a FailureAccrualPolicy to determine when to
mark an endpoint dead. The default policy, FailureAccrualPolicy.consecutiveFailures(),
mimicks existing functionality, and FailureAccrualPolicy.successRate() operates on the
exponentially weighted average success rate over a window of requests.``RB_ID=756921``
* finagle-core: Introduce `c.t.f.transport.Transport.Options` to configure transport-level options
(i.e., socket options `TCP_NODELAY` and `SO_REUSEADDR`). ``RB_ID=773824``
* finagle-netty4: Hello World. Introduce a `Listener` for Netty 4.1. This is still considered beta.
``RB_ID=718688``
* finagle-netty4: Introduce `ChannelTransport` for Netty 4.1. ``RB_ID=763435``
* finagle-thrift: `c.t.f.ThriftRichClient` implementations of `newServiceIface`
method that accept a `label` argument to pass to the `ScopedStats` instance. ``RB_ID=760157``
* finagle-http: `c.t.f.http.exp.Multipart` now supports both in-memory and on-disk file uploads.
``RB_ID=RB_ID=769889``
* finagle-stats: Added `c.t.f.stats` now has a `statsFilterFile` flag which will read a blacklist
of regex, newline-separated values. It will be used along with the `statsFilter` flag for stats
filtering. ``RB_ID=764914``
Deprecations
~~~~~~~~~~~~
* finagle-core: the #channelFactory method of `c.t.f.builder.ServerBuilder` has been deprecated
in favor of the `c.t.f.netty3.numWorkers` flag. ``RB_ID=718688``
Runtime Behavior Changes
~~~~~~~~~~~~~~~~~~~~~~~~
* finagle-core: The behavior for `c.t.f.util.DefaultMonitor` has changed such that
unhandled exceptions are propagated to `c.t.u.RootMonitor` except for
`c.t.f.Failures` with a log `Level` below INFO. ``RB_ID=758056``
* finagle-core: The metrics for requeues `requeue/requeues`, `requeue/budget` and
`requeue/budget_exhausted` have moved under retries. They are now `retries/requeues`,
`retries/budget` and `retries/budget_exhausted`. ``RB_ID=760213``
* finagle-core: `c.t.f.service.RetryFilter` and `c.t.f.service.RetryExceptionsFilter`
now default to using a `RetryBudget` to mitigate retry amplification on downstream
services. The previous behavior can be achieved by explicitly passing in
`RetryBudget.Infinite`. ``RB_ID=766302``
* finagle-core: `c.t.f.factory.TrafficDistributor` now suppresses changes when a bound
address is updated from a valid set to an error. Instead, it continues using stale
data until it gets a successful update.
* finagle-http: Unhandled exceptions from user defined HTTP services are now converted
into very basic 500 responses so clients talking to those services see standard HTTP
responses instead of a dropped connection. ``RB_ID=755846``
* finagle-mux: `com.twitter.finagle.mux.ThresholdFailureDetector` is turned on by
default. ``RB_ID=756213``
* finagle-serversets: The `c.t.f.serverset2.Zk2Resolver` now surfaces `Addr.Pending`
when it detects that its underlying ZooKeeper client is unhealthy. Unhealthy is defined
as non-connected for greater than its 'unhealthyWindow' (which defaults to 5 minutes).
``RB_ID=760771``
* finagle-serversets: The `c.t.f.serverset2.ZkSession` now uses an unbounded semaphore to
limit to 100 outstanding zookeeper requests at any one moment. ``RB_ID=771399``
Breaking API Changes
~~~~~~~~~~~~~~~~~~~~
* finagle-core: `BackupRequestLost` is no longer itself an `Exception`. Use
`BackupRequestLost.Exception` in its place. ``RB_ID=758056``
* finagle-core: Replaced `c.t.f.builder.ClientConfig.Retries` with
`c.t.f.service.Retries.Policy`. ``RB_ID=760213``
* finagle-core: A deprecated `c.t.f.CancelledReadException` has been removed.
``RB=763435``
* finagle-http: `c.t.f.http.exp.Multipart.decodeNonChunked` has been removed from
the public API. Use `c.t.f.http.Request.multipart` instead. Also
`c.t.f.http.exp.Multipart.FileUpload` is no longer a case class, but base trait
for `Multipart.InMemoryFileUpload` and `Multipart.OnDiskFileUpload`. ``RB_ID=769889``
* finagle-mux: `c.t.f.FailureDetector.apply` method is changed to private scope,
to reduce API surface area. Using `FailureDetector.Config` is enough to config
session based failure detection behavior. ``RB_ID=756833``
* finagle-mux: `closeThreshold` in `c.t.f.mux.FailureDetector.ThresholdConfig` is
changed to `closeTimeout`, from an integer that was used as a multiplier to time
duration. This makes it easier to config. ``RB_ID=759406``
Bug Fixes
~~~~~~~~~
* finagle-thrift: `c.t.f.ThriftRichClient` scoped stats label is now threaded
properly through `newServiceIface` ``RB_ID=760157``
6.30.0
------
New Features
~~~~~~~~~~~~
* finagle-core: `com.twitter.finagle.client.LatencyCompensator` allows its
default Compensator value to be set via an API call. This allows
libraries to set defaults for clients that have not configured this module.
``RB_ID=750228``
* finagle-core: New Resolver `com.twitter.finagle.FixedInetResolver` extends
InetResolver by caching successful DNS lookups indefinitely. It's scheme is 'fixedinet'.
This is used by clients or resolvers that do not want or expect
host->ip map changes (such as the zk2 resolver and twemcache client).
``RB_ID=753712``
Runtime Behavior Changes
~~~~~~~~~~~~~~~~~~~~~~~~
* finagle-core: `RetryPolicy.tries` now uses jittered backoffs instead of
having no delay. ``RB_ID=752629``
* finagle-core: `FailureAccrualFactory` uses jittered backoffs as the duration
to mark dead for, if `markDeadFor` is not configured. ``RB_ID=746930``
* finagle-core: The transit latency (transit_latency_ms) and deadline budget
(deadline_budget_ms) stats are now only recorded for servers, not for
clients anymore, since they're only meaningful for servers. ``RB_ID=75268``
* finagle-http: Clients sending requests with payloads larger than the server
accepts (default 5MB) now receive a HTTP 413 response instead of a channel
closed exception. ``RB_ID=753664``
Breaking API Changes
~~~~~~~~~~~~~~~~~~~~
* finagle-core: `TimerFromNettyTimer` is renamed to `HashedWheelTimer` and
the constructor accepting `org.jboss.netty.util.Timer` made private. For
compatibility, `HashedWheelTimer` has additional constructors to match
those provided by `org.jboss.netty.util.HashedWheelTimer`. ``RB_ID=748514``
* finagle-httpx / finagle-httpx-compat: Renamed to finagle-http and
finagle-http-compat respectively. This changes the package names, e.g.:
com.twitter.finagle.httpx to com.twitter.finagle.http. ``RB_ID=751876``
* finagle-core: Marked `HandletimeFilter` private[finagle], and renamed it to
`ServerStatsFilter`. ``RB_ID=75268``
* finagle-zipkin: Drop `c.t.zipkin.thrift.Annotation.duration` and associated thrift field
`c.t.f.thrift.thrift.Annotation.duration`. ``RB_ID=751986``
* finagle-stress: Project has been removed from Finagle. ``RB_ID=752201``
* finagle-swift: Project has been moved off of Finagle to
https://github.com/finagle/finagle-swift . ``RB_ID=752826``
6.29.0
------
Deprecations
~~~~~~~~~~~~
* finagle-http: Deprecated in favour of finagle-httpx and now removed.
New Features
~~~~~~~~~~~~
* finagle-core: Provides a `RetryFilter` which takes a
`RetryPolicy[(Req, Try[Rep])]` and allows you to retry on both "successful"
requests, such as HTTP 500s, as well as failed requests. The `Req`
parameterization facilitates using the request to determine if retrying is
safe (i.e. the request is idempotent).
* finagle-httpx: Experimental support `multipart/form-data` (file uploads)
decoding via `c.t.f.httpx.exp.Multipart`. ``RB_ID=730102``
Runtime Behavior Changes
~~~~~~~~~~~~~~~~~~~~~~~~
* finagle-core: `InetResolver.bind` will now succeed if any hostname resolution
succeeds. Previous behavior required that all hosts are successfully resolved.
``RB_ID=737748``
* finagle-core: DNS lookups in InetResolver are no longer cached
within Finagle according to `networkaddress.cache.ttl`; we rely
instead on however caching is configured in the JVM and OS. ``RB_ID=735006``
* finagle-core: After being revived, a `FailureAccrualFactory` enters a
'probing' state wherein it must successfully satisfy a request before
accepting more. If the request fails, it waits for the next `markDeadFor`
period. ``RB_ID=747541``
* finagle-serversets: DNS lookups in Zk2Resolver are no longer
cached within Finagle according to `networkaddress.cache.ttl`;
instead they are cached indefinitely. ``RB_ID=735006``
* finagle-redis: c.t.f.Redis now uses a pipelined dispatcher along with
a concurrent load balancer to help eliminate head-of-line blocking.
Breaking API Changes
~~~~~~~~~~~~~~~~~~~~
* finagle-core: `RetryingFilter`, which takes a RetryPolicy[Try[Nothing]]` and
is invoked only on exceptions, has been renamed to `RetryExceptionsFilter`.
`RetryExceptionsFilter` is a subclass of `RetryFilter`, which takes a
`RetryPolicy[(Req, Try[Rep])]` and allows you to retry on both "successful"
requests, such as HTTP 500s, as well as failed requests. The `Req`
parameterization facilitates using the request to determine if retrying is
safe (i.e. the request is idempotent).
* finagle-core: Name.all is now private to `com.twitter.finagle`.
* finagle-memcached: Unified stack-based construction APIs and cleanup internal
constructors. In particular, `KetamaClient` was removed and `KetamaPartitionClient`
and `KetamaFailureAccrualFactory` are now sealed inside Finagle. See
[[com.twitter.finagle.Memcached]] for how to construct a finagle-memcached client.
* finagle-redis: Port the c.t.f.Redis protocol object to the StackClient API.
A redis client can now be constructed and configured like the rest of the
finagle subprojects.
6.28.0
------
New Features
~~~~~~~~~~~~
Runtime Behavior Changes
~~~~~~~~~~~~~~~~~~~~~~~~
* finagle-core: Weights are no longer supported by the load balancers. They are moved
one level above and interpreted by a new module, the `TrafficDistributor`. This
frees the balancers to have non-linear load metrics. It also changes the semantics
of weights. They are now normalized by size of endpoints that share the same weight
and interpreted proportional to offered load (however, they can still be though of,
roughly, as multipliers for traffic). ``RB_ID=677416``
* finagle-core: The RequestSemaphoreFilter now sheds load by dropping the tail of the queue
and failing it with a `Failure.Restartable`. Previously, the filter had an unbounded
queue but now the default size is 0 (i.e. no queueing). The dropped requests are in
turn requeued by Finagle clients with protocol support (e.g. Http, ThriftMux).
``RB_ID=696934``
* finagle-core: `ServerBuilder.ServerConfig.BindTo`, `ServerBuilder.ServerConfig.MonitorFactory`,
and `ServerBuilder.ServerConfig.Daemonize`, are now private to `com.twitter.finagle.builder`. ``RB_ID=730865``
* finagle-memcachedx: Renamed to finagle-memcached.
* finagle-stats: Standard deviation ("$statName.stddev") is no longer exported.
``RB_ID=726309`` (follow up to ``RB_ID=717647``)
* finagle-serversets: `namer/bind_latency_us` stat now counts only
time in name resolution, not service acquisition.
`namer/{dtabcache,namecache,nametreecache}/misstime_ms` stats are
no longer exported. ``RB_ID=730309``
Breaking API Changes
~~~~~~~~~~~~~~~~~~~~
* finagle-core: `c.t.f.jsr166y` has been replaced with Java 7 API. finagle: Replace JSR166y
with Java 7 API. ``RB_ID=720903``
* finagle-core: `LoadBalancerFactory` no longer takes endpoints with weights as
per the decoupling mentioned in runtime changes. ``RB_ID=677416``
* finagle-core: `RequestSemaphoreFilter.Param` now accepts a `com.twitter.concurrent.AsyncSemaphore`
instead of an integer representing the max concurrency. ``RB_ID=696934``
* finagle-core: removed `c.t.f.asyncDns` flag and `c.t.f.SyncInetResolver`; DNS resolution is
now always asynchronous. ``RB_ID=734427``
* finagle-core: `ClientBuilder.ClientConfig.DefaultParams`, `ClientBuilder.ClientConfig.DestName`,
`ClientBuilder.ClientConfig.GlobalTimeout`, `ClientBuilder.ClientConfig.Daemonize`, and
`ClientBuilder.ClientConfig.MonitorFactory` are now private to `com.twitter.finagle.builder`.
`ClientBuilder.ClientConfig.Retries` is now private to `com.twitter`. ``RB_ID=727245``
* finagle-httpx: `Method` no longer has an extractor. To access the name of
custom methods, use `toString`. ``RB_ID=722913``
* finagle-mux: `c.t.f.mux.exp.FailureDetector` and `c.t.f.mux.exp.sessionFailureDetector` are
moved out of exp package into mux package. ``RB_ID=725350``
6.27.0
------
New Features
~~~~~~~~~~~~
* finagle-http: Support nacks between Finagle Http clients and servers. When a server fails
with retryable exceptions (exceptions wrapped by `Failure.rejected`), it sends back a "Nack"
response, i.e. 503 Response code with a new "finagle-http-nack" header. This allows clients
to safely retry failed requests, and keep connections open. ``RB_ID=705948``
Runtime Behavior Changes
~~~~~~~~~~~~~~~~~~~~~~~~
* finagle-core: FailFast parameter renamed from `onOrOff` to `enabled`. ``RB_ID=720781``
* finagle-core: When evaluating NameTree unions, return components of the union in Ok state rather
than waiting for all components to be Ok. This enables resilience of unions when part of the
tree cannot be resolved. ``RB_ID=697114``
* finagle-stats: Standard of deviation is no longer calculated. It is exported as a constant 0.0
for "$statName.stddev". ``RB_ID=717647``
Breaking API Changes
~~~~~~~~~~~~~~~~~~~~
* finagle-stream: Introduce StreamRequest as a replacement for Netty's
HttpRequest, and converted the rest of the public API to not leak
other Netty types (notably ChannelBuffer is replaced by Buf). ``RB_ID=695896``
* finagle-core: Dtab does not implement the Namer interface anymore. Use
`c.t.f.naming.DefaultInterpreter` to bind a name via a Dtab. Support for Dtab entries starting
with /#/ has been removed. `c.t.f.Namer.bindAndEval` has been removed. Use
`c.t.f.Namer.resolve` instead. ``RB_ID=711681``
* finagle: `LoadService` and `ThriftRichClient` migrated off of deprecated `ClassManifest`
to `ClassTag`. ``RB_ID=720455``
6.26.0
-------
Deprecations
~~~~~~~~~~~~
* finagle-memcached: Deprecated in favor of finagle-memcachedx and now removed.
New Features
~~~~~~~~~~~~
* finagle-httpx: Support nacks between Finagle Http clients and servers. When a server fails
with retryable exceptions (exceptions wrapped by `Failure.rejected`), it sends back a "Nack"
response, i.e. 503 Response code with a new "finagle-http-nack" header. This allows clients
to safely retry failed requests, and keep connections open. ``RB_ID=670046``
Breaking API Changes
~~~~~~~~~~~~~~~~~~~~
* finagle-core: Moved netty3 specific things into a netty3 namespace. For
these symbols, the namespace translation follows this pattern:
`c.t.f.$MODULE._ => c.t.f.netty3.$MODULE._.` ``RB_ID=691746``
* finagle-core: Define `WeightedSocketAddress` as a case class. Add
`WeightedSocketAddress.extract` method to extract weight. ``RB_ID=614228``
* finagle-core: Constructing a new Balancer that can be injected into a Finagle client
was unnecessarily complex and non-uniform. We removed the legacy constructors around
defining the collection of endpoints and simplified the interface to `LoadBalancerFactory`.
Now, `com.twitter.finagle.loadbalancer.Balancers` defines the collection of balancer
constructors. ``RB_ID=660730``
* finagle-core: Aperture can no longer be enabled via command line flags. Configuring
per-client settings globally is generally not a good idea and we're working to remove
these flags from Finagle. Use the constructors in `com.twitter.finagle.loadbalancer.Balancers`
to create an instance that can be injected into a client. ``RB_ID=663194``
* finagle-core: The default load balancer has changed to p2c from heap. ``RB_ID=693450``
* finagle-core: `Service.isAvailable` and `ServiceFactory.isAvailable` is finalized.
`Service.status` and `ServiceFactory.status` supersedes `isAvailable` usage since 6.24.0 release.
``RB_ID=678588``
* finagle-core: `ClientBuilder.failureAccrual` method is removed. Use `ClientBuilder.failureAccrualFactory`
instead. ``RB_ID=689076``
* finagle-core: Stack param `ClientBuilder.ClientConfig.FailureAccrualFac` is removed.
Use `ClientBuilder.failureAccrualFactory` instead. ``RB_ID=689076``
* finagle-exception: `com.twitter.finagle.exception.ExceptionReporter` is no longer used
as the default `com.twitter.finagle.util.ReporterFactory`. ``RB_ID=674646``
* finagle-kestrel: Replace deprecated finagle-kestrel package with finagle-kestrelx.
``RB_ID=667920``
* finagle-core: Add new method `noFailureAccrual` on `ClientBuilder` that completely disables
`FailureAccrualFactory` in the underlying stack. ``RB_ID=689076``
New Features
~~~~~~~~~~~~
- finagle-thrift: Support for finagle Services per thrift method.
6.25.0
------
Breaking API Changes
~~~~~~~~~~~~~~~~~~~~
* finagle-core: `c.t.f.builder.Server` now implements `c.t.f.ListeningServer`.
* finagle-core: `c.t.f.Server.serveAndAnnounce` with a `ServiceFactory` had
its first argument renamed to `name` from `forum`.
* finagle-core: Add an attribute map to `c.t.f.Addr.Bound`.
* finagle-core: `c.t.f.builder.ClientConfig.FailFast` has moved to
`c.t.f.FailFastFactory.FailFast`.
* finagle-core: NoBrokersAvailableException now has two Dtab constructor
arguments, both the base and local Dtabs.
* finagle-core: `c.t.f.Failure` convenience constructors (e.g., `Failure.Cause`,
`Failure.Rejected`) were removed in favor of uniform flag treatment, and clean
separation of attributes from interpretation of those attributes.
* finagle-core: `ExitGuard` usage is now private to finagle.
* finagle-core: `c.t.f.service.TimeoutFilter.module` is now split into
`TimeoutFilter.clientModule` and `TimeoutFilter.serverModule`.
* finagle-core: remove deprecated `c.t.f.builder.ClientBuilder.stack` taking a
`Stack.Params => Client[Req1, Rep1]`.
* finagle-core: StackRegistry.Entry takes different constructor arguments, and the
name has been bundled in with the Stack.Params. StackRegistry.Entry is only used
internally, so this should be relatively inexpensive. Similarly, StackRegister#register
has also had a small change to its method signature along the same lines.
* finagle-http: deprecated methods in `c.t.f.http.HttpMessageProxy` have been removed.
* finagle-memcached / finagle-memcachedx: move TwitterCacheResolver
and related objects to new finagle-cacheresolver package.
* finagle-memcached / finagle-memcachedx: failureAccrual param in ReplicationClient
is changed from type (Int, Duration) to (Int, () => Duration), to allow flexibility
to config duration. Also see `markDeadFor` change in finagle-core in the "New Features"
section below.
* finagle-memcached / finagle-memcachedx: MigrationClientTest now uses
ServerCnxnFactory from com.twitter.zk rather than NIOServerCnxn.Factory from
org.apache.zookeeper.server.
* finagle-mux: `c.t.f.mux.RequestNackedException` is removed in favor of a standard
Failure (`c.t.f.Failure.Rejected`).
* finagle-ostrich4: Switched dependency to finagle-httpx from finagle-http.
* finagle-serversets: ZkInstance in tests now uses ServerCnxnFactory from
com.twitter.zk rather than NIOServerCnxn.Factory from
org.apache.zookeeper.server.
* finagle-stats: Switched dependency to finagle-httpx from finagle-http.
* finagle-mysql: PreparedStatements are now more type-safe! The type signature of
PreparedStatements has changed from Seq[Any] => Future[Result] to Seq[Parameter] =>
Future[Result]. Parameter represents objects that are serializable by finagle-mysql.
In most cases, scalac should transparently wrap your arguments in Parameter when
applying a PreparedStatement. However, in cases where this doesn't happen you
can explicitly wrap them using `Parameter.wrap`.
Runtime Behavior Changes
~~~~~~~~~~~~~~~~~~~~~~~~
* finagle-core: `com.twitter.finagle.service.StatsFilter` no longer requires a
`com.twitter.finagle.stats.RollupStatsReceiver` for correct behaviour, and
providing one will double count failures.
* finagle-core: `com.twitter.finagle.factory.TimeoutFactory` will fail with
a retryable `com.twitter.finagle.Failure` when it times out.
* finagle-core: `com.twitter.finagle.pool.WatermarkPool` will fail with
an interrupted `com.twitter.finagle.Failure` when it is interrupted while
waiting or trying to establish a connection. It has previously failed with
a `com.twitter.finagle.WriteException` when trying to establish a
connection, but it's incorrect to retry on an interruption.
* finagle-core: `com.twitter.fiangle.RetryPolicy`'s `RetryableWriteException`
and `WriteExceptionsOnly` will not retry on `com.twitter.finagle.Failure`s
that are marked `InterruptedBy`, even if they are `Retryable`.
* finagle-core: The error message provided by `c.t.f.NoBrokersAvailableException`
prints both the base and local Dtabs.
* finagle-core: Stats produced by `com.twitter.finagle.factory.BindingFactory`
are now scoped with the "namer" prefix rather than "interpreter". The total
latency associated with Name binding is now recorded in the "bind_latency_ms"
stat.
* finagle-core: The "service_creation/service_acquisition_latency_ms" stat
produced by `com.twitter.finagle.factory.StatsFactoryWrapper` no longer
includes time spent in name resolution, which is now covered by
"namer/bind_latency_us" as discussed above.
* finagle-core: added transit_latency_ms and deadline_budget_ms stats.
* finagle-core: Automatic retries (requeues) are now credited as a ratio of
requests over a window of time, instead of a fixed limit. The stats scope
has also changed from "automatic" to "requeues".
Deprecations
~~~~~~~~~~~~
* finagle-core: `c.t.f.builder.Server.localAddress` is deprecated in favor of
`c.t.f.ListeningServer.boundAddress`.
New Features
~~~~~~~~~~~~
* finagle-core: `Fail fast <https://twitter.github.io/finagle/guide/FAQ.html#why-do-clients-see-com-twitter-finagle-failedfastexception-s>`_
is now `configurable <https://twitter.github.io/finagle/guide/FAQ.html#configuring-finagle6>`_
on Stack-based clients via the `com.twitter.finagle.FailFastFactory.FailFast` param.
* finagle-core: `com.twitter.finagle.service.StatsFilter` is now configurable with an
`com.twitter.finagle.stats.ExceptionStatsHandler` to customize how failures are recorded.
* finagle-core: It should be safe to match on `com.twitter.finagle.Failure.InterruptedBy`
to tell if a `com.twitter.util.Future` failed due to being interrupted.
* finagle-core: `markDeadFor` in c.t.f.service.FailureAccrualFactory.Param is changed from
Duration type to () => Duration. So it's flexible for clients to pass in a function that
specifies Duration. For example, c.t.f.service.FailureAccrualFactory provides a function
that adds perturbation in durations. Stack-based API and c.t.f.builder.ClientBuilder
support both types for client configuration. For example,
::
Thrift.client.configured(FailureAccrualFactory(5, () => 1.seconds))
// or
Thrift.client.configured(new FailureAccrualFactory(5, 1.seconds)).
c.t.f.client.DefaultClient does not support Duration type in failureAccrual anymore.
* finagle-core: improved Java compatiblity for `c.t.f.Stack.Params` / `c.t.f.Stack.Parameterized`.
* finagle-core: Introduce the ability to add metadata to bound `com.twitter.finagle.Addr`s.
* finagle-core: Introduce per-address latency compensation. Clients may be configured with
a 'Compensator' function that uses the client's address metadata to adjust connection and
request timeouts. This can be used, for instance, to account for speed-of-light latency
between physical regions.
* finagle-core: Introduce per-address stats scoping. Clients may be configured with
a `com.twitter.finagle.client.StatsScoping.Scoper` function that uses the client's
address metadata to adjust the scope of client stats. This can be used, for instance,
to properly scope client stats for a Name that resolves to a Union of distinct clusters.
* finagle-core: A convenient method `Client.newService(dest: String, label: String)` was added.
* finagle-core: ExitGuard now has an 'explainGuards' method to provide a human-readable
description of exit guards that are still active.
* finagle-http(x): Two missing params were added: `Decompression` and `CompressionLevel`. Both
client and server may be configured with either `configured` method or `withDecompression`/
`withCompressionLevel`.
* finagle-mysql: Add support for MySQL transactions.
* finagle-stats: A new HostStatsReceiver type is added and used for per host stats.
It is loaded through LoadService and used by the Stack-based API as a default
param. Per host stats can be turned on through `com.twitter.finagle.loadbalancer.perHostStats`
flag, and is exported to the "/admin/per_host_metrics.json" route in twitter-server.
* finagle-stats: Improved compatibility when migrating from
`Ostrich <https://github.com/twitter/ostrich/>`_ stats via two flags:
``com.twitter.finagle.stats.useCounterDeltas=true`` and
``com.twitter.finagle.stats.format=ostrich``. If these flags are both set,
HTTP requests to ``/admin/stats.json`` with the ``period=60`` query string
parameter will replicate Ostrich's behavior by computing deltas on counters
every minute and formatting histograms with the same labels Ostrich uses.
* finagle-memcached(x): Add `c.t.f.memcached.Memcached` which provides a Stack
based Memcache client that uses pipelining.
Bug Fixes
~~~~~~~~~
* finagle-core: `c.t.f.Server.serveAndAnnounce` for a `Service` had its usage
of `name` and `addr` transposed.
Miscellaneous Cleanup
~~~~~~~~~~~~~~~~~~~~~
* finagle-protobuf: Move entire unused subproject to the `Finagle
organization on GitHub <https://github.com/finagle/finagle-protobuf>`_.
6.24.0
------
Breaking API Changes
~~~~~~~~~~~~~~~~~~~~
* finagle-core: Remove `c.t.f.client.StackClient.Role.loadBalancer`, which
was unused and duplicated by `c.t.f.loadbalancer.LoadBalancerFactory.role`.
* finagle-core: `c.t.f.Namer.orElse` was removed; composing Namers
may be accomplished by constructing an appropriate Dtab.
* finagle-core: removed experimental `enum` / `expand` from
`c.t.f.Namer` and `alt` / `union` from `c.t.f.Dtab`.
* finagle-http: Remove `c.t.f.http.CheckRequestFilter` along with
`c.t.f.http.CheckHttpRequestFilter`. The functionality has been
added to `c.t.f.http.codec.HttpServerDispatcher`. In addition,
the codecError in `c.t.f.http.BadHttpRequest` has been replaced
with the exception thrown by the HttpServerCodec.
* finagle-httpx: Remove deprecated code, limited scope of access on internal
classes.
* finagle-mux: `c.t.f.mux.lease.exp.WindowedByteCounter` no longer
calls `Thread.start()` in its constructor. This should be now be
done by the caller.
* finagle-mux: The experimental session API is discontinued.
* finagle-mux: Introduce new Request and Response types for mux services.
The new mux request includes a `destination` path so that, which corresponds
to the `destination` field in Tdispatch requests. Furthermore, these new
types expose `c.t.io.Buf` instead of Netty's ChannelBuffers.
* finagle-thrift,finagle-thriftmux: `c.t.f.Thrift.Client`, `c.t.f.Thrift.Server`,
`c.t.f.ThriftMux.Client` and `c.t.f.ThriftMux.Server` have their
`TProtocolFactory` configured via a `c.t.f.thrift.param.ProtocolFactory`
`Stack.Param`.
* finagle-thriftmux: `c.t.f.ThriftMux.Client` now has its `ClientId`
configured via a `c.t.f.thrift.param.ClientId` `Stack.Param`.
* Traces (``com.twitter.finagle.tracing.Trace``) lose their local-state mutating methods:
``Trace.clear``, ``Trace.pushId``, ``Trace.setId``, ``Trace.setTerminalId``, ``Trace.pushTracer``,
``Trace.pushTracerAndSetNextId``,
``Trace.state_=``, and ``Trace.unwind``.
Let-bound versions of these are introduced in their stead.
This makes it simple to ensure that state changes are properly delimited;
further, these are always guaranteed to be delimited properly by Finagle.
::
Trace.setTracer(tracer)
codeThatUsesTracer()
// Let-bound version:
Tracer.letTracer(tracer) {
codeThatUsesTracer()
}
* Context handlers (``com.twitter.finagle.Context``) are removed.
They are replaced by the use of marshalled request contexts
(``com.twitter.finagle.context.Contexts.broadcast``).
Marshalled request contexts do not require the use of service loading,
so their use no longer requires build system coordination.
We show Finagle's trace context:
the first version uses the old context handler mechanism;
the second uses ``Contexts.broadcast``.
::
// The old context handler for Finagle's tracing context. Note that this
// also required the file
// finagle-core/src/main/resources/META-INF/services/com.twitter.finagle.ContextHandler
// to contain the fully qualifed class path of the below object.
class TraceContext extends ContextHandler {
val key = Buf.Utf8("com.twitter.finagle.tracing.TraceContext")
def handle(body: Buf) {
// Parse 'body' and mutate the trace state accordingly.
}
def emit(): Option[Buf] = {
// Read the trace state and marshal to a Buf.
}
}
// New definition. No service loading required.
private[finagle] val idCtx = new Contexts.broadcast.Key[TraceId] {
val marshalId = Buf.Utf8("com.twitter.finagle.tracing.TraceContext")
def marshal(id: TraceId): Buf = {
// Marshal the given trace Id
}
def tryUnmarshal(body: Buf): Try[TraceId] = {
// Try to marshal 'body' into a trace id.
}
}
Runtime Behavior Changes
~~~~~~~~~~~~~~~~~~~~~~~~
* finagle-mux: Mark the ServiceFactory available again if the underlying
Service is no longer available. This permits it to be closed and reused.
* finagle-mux: Rename the "lease_counter" counter to "leased" on mux clients.
Deprecations
~~~~~~~~~~~~
* finagle-core: Deprecated the mechanisms of FailureAccrual that use
factory Transformers. It's better to just use the Params to
configure the existing FailureAccrualFactory. However, if you've
actually written your own failure accrual transformer that's
significantly different, then you can do stack.replace() to swap it
in.
* finagle-memcached: Have cas() operation return false on NotFound()
state instead of throw IllegalStateException
New Features
~~~~~~~~~~~~
* finagle-core: All `Stack.Param`s used in `ClientBuilder` and
`ServerBuilder` are now publicly exposed for configuration
parity.
* finagle-mux: Drain mux servers properly, so that shutdowns can be
graceful.
* finagle-core: Introduce `Service.status` which supersedes
`Service.isAvailable`. `Service.status` is a fine-grained
health indicator. The default definition of
`Service.isAvailable` is now defined in terms of
`Service.status`; this definition will soon be made
final.
* finagle-mux: Inject bound residual paths into mux requests.
* *Request contexts.* Request contexts replace the direct use of
com.twitter.util.Local and of com.twitter.finagle.Context.
Request contexts are environments of request-local bindings;
they are guaranteed to be delimited by Finagle,
and their API admits only properly delimited binding.
They come in two flavors:
Contexts.local are always local to handling a single request;
bindings in Contexts.broadcast may be marshalled and transmitted across process
boundaries where there is protocol support.
Currently, both Thrift and Mux (and thus also ThriftMux)
support marshalled contexts.
See `com.twitter.finagle.contexts.Context` for more details.
6.23.0
------
Breaking API Changes
~~~~~~~~~~~~~~~~~~~~
* finagle-core: `c.t.f.Stackable`s maintained state about which parameters were
accessed via `get`. This was error prone and violated the assumption that `Stack`s
are immutable data structures. We removed this in favor of annotating modules with
parameters. The abstract classes for Stackables were also simplified. Now we only have
`Module` and `ModuleN` variants which are more convenient for most definitions.
Since this is an advanced API, it should not impact standard usage of finagle.
* finagle-core: Update ConcurrentRingBuffer to use ClassTag instead of ClassManifest;
rename size argument to capacity.
Deprecations
~~~~~~~~~~~~
* `ServerBuilder.stack[Req1, Rep1](mk: Stack.Params => Server[Req1, Rep1])` is
deprecated in favor of
`ServerBuilder.stack[Req1, Rep1](server: Stack.Parameterized[Server[Req1, Rep1]])`
Runtime Behavior Changes
~~~~~~~~~~~~~~~~~~~~~~~~
* `finagle`: Improve allocation semantics for uses of Buf.
6.22.0
-------
Breaking API Changes
~~~~~~~~~~~~~~~~~~~~
* finagle-core: Removed unused `com.twitter.finagle.service.ProxyService`. It wasn't
sufficiently general to be used outside of finagle, and was no longer used
in finagle.
* Removed TLSEngine, and replaced it with two, TLSClientEngine, and
TLSServerEngine, where TLSServerEngine is the same as TLSEngine, and
TLSClientEngine takes a SocketAddress instead of (). Additionally,
the Netty3TransporterTLSConfig now takes a function SocketAddress => Engine,
instead of () => Engine.
New Features
~~~~~~~~~~~~
* finagle-core: BroadcastStatsReceiver, introduce specialized implementation
* finagle-core: Introduce gauges in SummarizingStatsReceiver
* finagle-core: Introduce Transport#copyToWriter
* finagle-core: Make base Dtab used in BindingFactory a Stack.Param
* finagle-core: Proper decay in experimental ewma load metric
* finagle-core: Simplify Stack{Client, Server} and unify around them
Runtime Behavior Changes
~~~~~~~~~~~~~~~~~~~~~~~~
* finagle-core: Add support for non-URLClassloaders to LoadService
* finagle-core: clear locals before entering server dispatch loop
* finagle-core: Defer DNS Resolution in InetResolver to FuturePool
* finagle-core: for paths starting with /#/, skip rewrites where prefix is /
* finagle-core: include name resolution in tracing request span
* finagle-core: Properly wrap some IOException into ConnectionFailedException
* finagle-core: Scope InetResolver's stats properly
* finagle-http: Send "Connection: close" header while dispatcher is closing
* finagle-http: Set content length header when appropriate
* finagle-memcached: Use interruptible future for the client request readiness
* finagle-stats: Add content-type response header to JsonExporter
* finagle-thrift: Add back connection_preparation_latency stat in Thrift
* finagle-thriftmux: Record protocol as a gauge rather than a counter
Documentation
~~~~~~~~~~~~~
* finagle-core: Add Scaladocs for ChannelBufferBuf and BufChannelBuffer
* finagle-core: link to the FAQ in FailedFastException
* finagle-serversets: Defer DNS resolution for endpoints to InetResolver
* finagle-thrift{,mux}: Clarified with* deprecation warning
* Fix minor issues and missing code blocks in Finagle documentation
Optimization
~~~~~~~~~~~~
* finagle-core: GlobalFlag isn't caching the property value
* finagle-core: recursive-descent Path / NameTree / Dentry / Dtab parsers to reduce heap allocation
Bug Fixes
~~~~~~~~~
* finagle-core: Fix a deadlock in Contexts
* finagle-core: Fix breaking ABI change in SummarizingStatsReceiver
* finagle-core: Fix bug in computing array index in SummarizingStatsReceiver
* finagle-core: Fix build.properties location for maven builds
* finagle-core: Fix synchronization in LeasedFactory
* finagle-core: Fix tracing with Stack{Client, Server}
* finagle-core: Make FailedFastException an instance variable.
* finagle-core: Synchronized access to the Stackable mutable.params map
* finagle-http: Fix CookieMap.rewriteCookieHeaders()
* finagle-http: Fix the memory leak in HttpClientDispatcher
* finagle-mysql: Fix timestamp fractional seconds encoding
* finagle-mysql: Properly heed timezone when extracting TimestampValue
* mux: clear contexts after receive, not in 'finally' clause
6.21.0
------
- `finagle`: Upgrade to scala_2.10
- `finagle-core`: Add weighted address support to InetResolver.
- `finagle-core`: Adds ClientRegistry.expAllRegisteredClientsResolved
- `finagle-core`: Attach Dtab.local to NoBrokersAvailableException in filter
- `finagle-core`: Attempt to add dtab stats to all clients and servers
- `finagle-core`: Avoid SOCKS proxy for both loopback and link-local addresses
- `finagle-core`: Bind names lazily under Alt so we don't do needless lookups
- `finagle-core`: DelayedFactory to detachable implementation
- `finagle-core`: Fix a race in load balancer initialization
- `finagle-core`: Improve loadbalancer logging
- `finagle-core`: Introduce ewma load metric
- `finagle-core`: Log state for ewma load metric
- `finagle-core`: Redesign of twitter-server admin page
- `finagle-core`: Register StackClient with Path dest in ClientRegistry as evaluated against Dtab.base Problem
- `finagle-core`: Rewrote ServiceLoader to avoid creating
- `finagle-core`: SingletonPool: a single-service pool with good semantics
- `finagle-core`: Zipkin tracing for name resolution
- `finagle-core`: fix synchronization in SummarizingStatsReceiver
- `finagle-core`: reusing pool: isAvailable === underlying.isAvailable
- `finagle-docs`: A better picture for filters. (Replaces hand-drawn monstrosity.)
- `finagle-docs`: Add Scaladocs for all public exception classes in Finagle.
- `finagle-docs`: Add a section to the FAQ regarding FailedFastExceptions
- `finagle-exp`: Generify the DarkTrafficFilter problem
- `finagle-guide`: Document stabilizing serverset metrics.
- `finagle-http`: Add support for a Dtab-Local header
- `finagle-http`: Fail requests with invalid X-Dtab headers
- `finagle-http`: Fail requests with invalid X-Dtab headers
- `finagle-http`: TextualContentCompressor should compress textual Content-Type's even when containing a charset
- `finagle-mux`,thriftmux: explain why the files are named Netty3
- `finagle-mux`: Better gc avoidance flags for experimentation
- `finagle-mux`: Enable gc avoidance for parallel gc
- `finagle-mux`: Improve mux's handling of client disconnects
- `finagle-mux`: Improved Garbage Collection Avoidance Docs
- `finagle-mux`: docs and minor cleansing in Message subclasses
- `finagle-mysql`: Switches PreparedCache over to util-cache FutureCache
- `finagle-serversets`: Add support for getEphemerals ZooKeeper call
- `finagle-serversets`: Memoize getChildrenWatchOp instead of globPrefixWatchOp
- `finagle-serversets`: Reuse ObjectMapper in JSON parser.
- `finagle-serversets`: add latency metrics for ServerSet2.
- `finagle-zipkin`: Reduce allocations when tracing
6.20.0
-------
- `finagle`: Smattering of minor cleanups in util and finagle
- `finagle`: Upgrade sbt to 0.13
- `finagle`: Upgrade to Netty 3.9.1.1.Final
- `finagle-core`: Add NameTree.Fail to permit failing a name without fallback
- `finagle-core`: Add a generic DtabStatsFilter
- `finagle-core`: Add a singleton exception and a counter in WatermarkPool
- `finagle-core`: DefaultClient in terms of StackClient
- `finagle-core`: Disable Netty's thread renaming
- `finagle-core`: Fix CumulativeGauge memory leak
- `finagle-core`: Fix negative resolution in Namer.global
- `finagle-core`: Fixed ChannelStatsHandler to properly filter exceptions
- `finagle-core`: Forces finagle-core to use ipv4 network stack
- `finagle-core`: Improve `Failure.toString`
- `finagle-core`: Include path and Dtab.local in NoBrokersAvailableException
- `finagle-core`: Log exceptions caught by ChannelStatsHandler
- `finagle-core`: Make timer-based DNS resolution as default of InetResolver
- `finagle-core`: Reader and getContent symmetry
- `finagle-core`: Reduces log level for common exceptions
- `finagle-core`: Register clients centrally
- `finagle-doc`: Add fintop to companion projects list on Finagle website
- `finagle-http`: Don't emit (illegal) newlines in lengthy dtab header values
- `finagle-http`: Fix code style from an open-source contribution
- `finagle-http`: Migrate from specs to scalatest
- `finagle-kestrel`: Make transaction abort timeout configurable in MultiReader
- `finagle-mux`: Added extra client logging
- `finagle-mux`: Fix broken draining behavior
- `finagle-mux`: Improve granularity of rate to bytes/millisecond
- `finagle-serversets`: Handle errors that occur when fetching endpoints
- `finagle-serversets`: Increase ZK session timeout to 10 seconds
- `finagle-serversets`: Merge WeightedSocketAddresses with same host:port but different weight in Stabilizer
- `finagle-serversets`: Synchronize bug fixes & test coverage across ZK facades
- `finagle-swift`: Fixes pants build warning
- `finagle-thrift`: Add explicit dependency on libthrift
- `finagle-thrift`: Remove usage of java_sources, should be able to depend on it normally
6.19.0
-------
- `finagle-core`: Allow trailing semicolons in dtabs
- `finagle-core`: Rescue exceptions thrown by filter in `Filter.andthen(Filter)`
- `finagle-core`: StackClient, StackClientLike don't leak underlying In, Out types
- `finagle-doc`: Clarify cancellation
- `finagle-doc`: Fix broken link in document
- `finagle-doc`: Fix name footnote in finagle Names docs
- `finagle-http`: Buf, Reader remove Buf.Eof; end-of-stream is None
- `finagle-http`: Prepend comment to JSONP callbacks
- `finagle-http`: Removing specs from the CookieMapSpec test.
- `finagle-kestrel`: Make failFast configurable in Kestrel codec
- `finagle-mysql`: Ensure mysql specific tracing is composed.
- `finagle-mysql`: Finagle MySQL PreparedStatement accepts Value types as params.
- `finagle-serversets`: Identity Providers for Serverset2
- `finagle-thriftmux`: Add withProtocolFactory API endpoint
- `finagle-thriftmux`: Don't reuse InMemoryStatsReceiver in the same test
6.18.0
-------
- `finagle-*`: release scrooge v3.16.0
- `finagle-*`: release util v6.18.0
- `finagle-core`: Add `description` field to com.twitter.finagle.Stackable trait
- `finagle-core`: Add a Flag to turn on per-host stats
- `finagle-core`: Add a service acquisition latency stat to StatsFactoryWrapper
- `finagle-core`: Don't support empty path elements in com.twitter.finagle.Path
- `finagle-core`: Improves FailFastFactory documentation
- `finagle-core`: Make c.t.f.Failure a direct subclass of Exception
- `finagle-core`: Skip SOCKS proxy when connecting to loopback address
- `finagle-core`: Use Monitor from caller's context in DefaultTimer
- `finagle-http`: Add "Enhance Your Calm" and "Too Many Requests" HTTP status codes
- `finagle-http`: Add exp.HttpServer, which allows request limits to be configured
- `finagle-http`: Change Request#params to a memoized def
- `finagle-http`: Stream request body
- `finagle-kestrel`: Add Name-based methods for MultiReader construction
- `finagle-memcached`: Expose the client type `KetamaClient` in the `build()` API
- `finagle-mux`: GC Avoidance Algorithm
- `finagle-mux`: Hook up GC avoidance to servers
- `finagle-mux`: Move UseMux.java to the correct directory
- `finagle-serversets`: Randomizes backoff interval in ZK2
- `finagle-serversets`: Start resolution eagerly in ZK2
- `finagle-stats`: Add a stat-filtration GlobalFlag
- `ostrich`: release ostrich v9.5.2
- `user guide`: Add Google Analytics tracking code
- `user guide`: Add sections about review process and starter issues
- `user guide`: Update Finagle adopter list on user guide website
- `wily`: Add Dtab expansion
6.17.0
-------
- `finagle`: Add list of Finagle adopters
- `finagle`: Upgrade third-party dependencies
- `finagle-core`: Add `Addr.Neg` to the user guide's list of Addr types
- `finagle-core`: Added Failure support for sourcing to finagle
- `finagle-core`: ClientBuilder should turn per-host stats off by default (matching new Client building API).
- `finagle-core`: Implement DefaultServer in terms of StackServer
- `finagle-core`: Improve the Dtab API
- `finagle-core`: Prevent scoping stats with the empty-string
- `finagle-core`: Rolls up the /tries scope properly
- `finagle-core`: ServerStatsReceiver and ClientStatsReceiver can now update their root scope
- `finagle-core`: fix race case in DelayedFactory
- `finagle-core`: introduce AbstractResolver
- `finagle-core`: remove need for hostConnectionLimit when using ClientBuilder#stack
- `finagle-core`: widen to type for ServerBuilder#stack