release/v20.03 - perf(raft): Use raft storage in managedmode (#6457) #6545
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This PR changes how we use badger in the wal store. Currently we run badger in normal mode for `w` and `zw` store. We've seen up to 900K entries for the same hard state (hs) key in `zw` store. These duplicate keys cause spikes in read latencies in `zw`. The `w` store has more compactions compared to `zw` store and so it has lesser stale data and thus lesser spikes in read latencies. The fix here is to open the `w` and `zw` directories in managed mode and perform all writes on the same timestamp (max version in the db). This leads to close to 0 duplicates in the store. This PR also fixes the raft leader election issue which is a result of high read latencies. (cherry picked from commit 6882e37)
martinmr
approved these changes
Sep 21, 2020
There was a problem hiding this comment.
Reviewed 8 of 8 files at r1.
Reviewable status:complete! all files reviewed, all discussions resolved (waiting on @manishrjain)
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This PR changes how we use badger in the wal store. Currently we run
badger in normal mode for
wandzwstore. We've seen up to 900Kentries for the same hard state (hs) key in
zwstore. These duplicatekeys cause spikes in read latencies in
zw. Thewstore has morecompactions compared to
zwstore and so it has lesser stale data andthus lesser spikes in read latencies.
The fix here is to open the
wandzwdirectories in managed mode andperform all writes on the same timestamp (max version in the db). This
leads to close to 0 duplicates in the store.
This PR also fixes the raft leader election issue which is a result of high
read latencies.
(cherry picked from commit 6882e37)
This change is
Docs Preview: