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HOTIFX: fix Kafka Streams upgrade path from 3.4 to 3.5 #14103

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mjsax merged 6 commits into from
Aug 18, 2023
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HOTIFX: fix Kafka Streams upgrade path from 3.4 to 3.5 #14103

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HOTIFX: fix Kafka Streams upgrade path from 3.4 to 3.5
mjsax Jul 26, 2023
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10 changes: 8 additions & 2 deletions clients/src/main/java/org/apache/kafka/common/config/ConfigDef.java
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Original file line number Diff line number Diff line change
Expand Up @@ -947,9 +947,15 @@ public String toString() {
}

public static class ValidString implements Validator {
final List<String> validStrings;
// visible for testing

@cadonna cadonna Jul 27, 2023

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I am not a fan of "visible for testing". What about the following:

  1. We add an enum to StreamsConfig:
    public enum UpgradeFromValues {
        UPGRADE_FROM_0100("0.10.0"),
        ...
        UPGRADE_FROM_34("3.4");


        private final String value;

        UpgradeFromValues(final String value) {
            this.value = value;
        }

        public String toString() {
            return value;
        }
    }
  1. We change the constants to:
public static final String UPGRADE_FROM_34 = UpgradeFromValues.UPGRADE_FROM_34.toString();
  1. We can use the enum in the tests and in the code.

@cadonna cadonna Jul 27, 2023 •
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Since we just add a constant enum to StreamsConfig and given the hotfix character, I would argue we do not need a KIP for this.

@mjsax mjsax Aug 10, 2023 •
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This part does not work: public static final String UPGRADE_FROM_34 = UpgradeFromValues.UPGRADE_FROM_34.toString();

We use

switch ((String) upgradeFrom) {
                case StreamsConfig.UPGRADE_FROM_0100:
                ...
}

and the compiler complain that StreamsConfig.UPGRADE_FROM_0100 must be a const

error: constant string expression required
    case StreamsConfig.UPGRADE_FROM_0100:

So not sure if we gain much adding the enum? -- We would still need to remember update the enum, and thus have a "split brain" problem -- getting the List out of the CONFIG object seems to be safer.

Thoughts?

@mjsax mjsax Aug 10, 2023

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I pushed a corresponding update, but I am not super happy with it... I believe the original idea to get the list of values from CONFIG is safer. Curious to hear what others think. In the end I am fine both ways.

@cadonna cadonna Aug 14, 2023

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You can use:

switch (StreamsConfig.UpgradeFromValues.valueOf((String) upgradeFrom)) {
    case UPGRADE_FROM_0100:
    ...

Additionally, we can implement a validator that uses the enum to verify the values here:

.define(UPGRADE_FROM_CONFIG,
                    ConfigDef.Type.STRING,
                    null,
                    in(null,
                       UPGRADE_FROM_0100,
                       UPGRADE_FROM_0101,
                       UPGRADE_FROM_0102,
                       UPGRADE_FROM_0110,
                       UPGRADE_FROM_10,
                       UPGRADE_FROM_11,
                       UPGRADE_FROM_20,
                       UPGRADE_FROM_21,
                       UPGRADE_FROM_22,
                       UPGRADE_FROM_23,
                       UPGRADE_FROM_24,
                       UPGRADE_FROM_25,
                       UPGRADE_FROM_26,
                       UPGRADE_FROM_27,
                       UPGRADE_FROM_28,
                       UPGRADE_FROM_30,
                       UPGRADE_FROM_31,
                       UPGRADE_FROM_32,
                       UPGRADE_FROM_33,
                       UPGRADE_FROM_34),
                    Importance.LOW,
                    UPGRADE_FROM_DOC)

So we do not need to maintain this list separately from the strings and enums.

protected final List<String> validStrings;

private ValidString(List<String> validStrings) {
// visible for testing
protected ValidString(ValidString validString) {
this(validString.validStrings);
}

ValidString(List<String> validStrings) {
this.validStrings = validStrings;
}

Expand Down
3 changes: 2 additions & 1 deletion streams/src/main/java/org/apache/kafka/streams/StreamsConfig.java
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Original file line number Diff line number Diff line change
Expand Up @@ -147,7 +147,8 @@ public class StreamsConfig extends AbstractConfig {

private static final Logger log = LoggerFactory.getLogger(StreamsConfig.class);

private static final ConfigDef CONFIG;
// visible for testing
protected static final ConfigDef CONFIG;

private final boolean eosEnabled;
private static final long DEFAULT_COMMIT_INTERVAL_MS = 30000L;
Expand Down
1 change: 1 addition & 0 deletions streams/src/main/java/org/apache/kafka/streams/kstream/internals/ChangedSerializer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -77,6 +77,7 @@ private static boolean isUpgrade(final Map<String, ?> configs) {
case StreamsConfig.UPGRADE_FROM_32:
case StreamsConfig.UPGRADE_FROM_33:
case StreamsConfig.UPGRADE_FROM_34:
// there is no need to add new version here
return true;
default:
return false;
Expand Down
1 change: 1 addition & 0 deletions streams/src/main/java/org/apache/kafka/streams/kstream/internals/KTableRepartitionMap.java
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Original file line number Diff line number Diff line change
Expand Up @@ -119,6 +119,7 @@ private boolean isNotUpgrade(final Map<String, ?> configs) {
case StreamsConfig.UPGRADE_FROM_32:
case StreamsConfig.UPGRADE_FROM_33:
case StreamsConfig.UPGRADE_FROM_34:
// there is no need to add new versions here
return false;
default:
return true;
Expand Down
1 change: 1 addition & 0 deletions ...a/org/apache/kafka/streams/kstream/internals/foreignkeyjoin/SubscriptionWrapperSerde.java
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Original file line number Diff line number Diff line change
Expand Up @@ -94,6 +94,7 @@ private static boolean upgradeFromV0(final Map<String, ?> configs) {
case StreamsConfig.UPGRADE_FROM_31:
case StreamsConfig.UPGRADE_FROM_32:
case StreamsConfig.UPGRADE_FROM_33:
// there is no need to add new versions hers

@fqaiser94 fqaiser94 Jul 26, 2023

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Suggested change
// there is no need to add new versions hers
// there is no need to add new versions here

return true;
default:
return false;
Expand Down
6 changes: 6 additions & 0 deletions ...n/java/org/apache/kafka/streams/processor/internals/assignment/AssignorConfiguration.java
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Original file line number Diff line number Diff line change
Expand Up @@ -123,6 +123,9 @@ public RebalanceProtocol rebalanceProtocol() {
case StreamsConfig.UPGRADE_FROM_31:
case StreamsConfig.UPGRADE_FROM_32:
case StreamsConfig.UPGRADE_FROM_33:
case StreamsConfig.UPGRADE_FROM_34:

@mjsax mjsax Aug 10, 2023

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This is the actual fix.

// we need to add new version when new "upgrade.from" values become available

// This config is for explicitly sending FK response to a requested partition
// and should not affect the rebalance protocol
break;
Expand Down Expand Up @@ -178,6 +181,9 @@ public int configuredMetadataVersion(final int priorVersion) {
case StreamsConfig.UPGRADE_FROM_31:
case StreamsConfig.UPGRADE_FROM_32:
case StreamsConfig.UPGRADE_FROM_33:
case StreamsConfig.UPGRADE_FROM_34:

@mjsax mjsax Aug 10, 2023

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This is the actual fix.

// we need to add new version when new "upgrade.from" values become available

// This config is for explicitly sending FK response to a requested partition
// and should not affect the metadata version
break;
Expand Down
67 changes: 67 additions & 0 deletions ...va/org/apache/kafka/streams/processor/internals/assignment/AssignorConfigurationTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -16,15 +16,34 @@
*/
package org.apache.kafka.streams.processor.internals.assignment;

import org.apache.kafka.clients.consumer.ConsumerPartitionAssignor;
import org.apache.kafka.common.config.ConfigDef;
import org.apache.kafka.common.config.ConfigException;
import org.apache.kafka.streams.StreamsConfig;
import org.junit.Before;
import org.junit.Test;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import static org.apache.kafka.common.utils.Utils.mkEntry;
import static org.apache.kafka.common.utils.Utils.mkMap;
import static org.apache.kafka.streams.processor.internals.assignment.AssignmentTestUtils.EMPTY_RACK_AWARE_ASSIGNMENT_TAGS;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.containsString;
import static org.junit.Assert.assertThrows;
import static org.mockito.Mockito.mock;

public class AssignorConfigurationTest {
private final Map<String, Object> config = new HashMap<>();

@Before
public void setup() {
config.put(StreamsConfig.APPLICATION_ID_CONFIG, "app.id");
config.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, "dummy");
config.put(StreamsConfig.InternalConfig.REFERENCE_CONTAINER_PARTITION_ASSIGNOR, mock(ReferenceContainer.class));
}

@Test
public void configsShouldRejectZeroWarmups() {
Expand All @@ -35,4 +54,52 @@ public void configsShouldRejectZeroWarmups() {

assertThat(exception.getMessage(), containsString("Invalid value 0 for configuration max.warmup.replicas"));
}

@Test
public void rebalanceProtocolShouldSupportAllUpgradeFromVersions() {
for (final String upgradeFrom : TestConfig.upgradeFromVersions()) {
config.put(StreamsConfig.UPGRADE_FROM_CONFIG, upgradeFrom);
final AssignorConfiguration assignorConfiguration = new AssignorConfiguration(config);

// next call should not throw
assignorConfiguration.rebalanceProtocol();

@cadonna cadonna Jul 27, 2023

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A more readable option without the need for a comment is:

Suggested change
// next call should not throw
assignorConfiguration.rebalanceProtocol();
try {
assignorConfiguration.rebalanceProtocol();
} catch (final Throwable throwable) {
throw new AssertionFailedError("Upgrade from " + upgradeFrom + " failed with " + throwable.getMessage() + "!");
}

}
}

@Test
public void configuredMetadataVersionShouldSupportAllUpgradeFromVersions() {
for (final String upgradeFrom : TestConfig.upgradeFromVersions()) {
config.put(StreamsConfig.UPGRADE_FROM_CONFIG, upgradeFrom);
final AssignorConfiguration assignorConfiguration = new AssignorConfiguration(config);

// next call should not throw
assignorConfiguration.configuredMetadataVersion(0);

@cadonna cadonna Jul 27, 2023

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See my previous comment.

}
}

private static class TestValidString extends ConfigDef.ValidString {
protected TestValidString(final ConfigDef.ValidString validString) {
super(validString);
}

List<String> validStrings() {
return validStrings;
}
}

private static class TestConfig extends StreamsConfig {
public TestConfig() {
super(mkMap(
mkEntry(StreamsConfig.APPLICATION_ID_CONFIG, "app.id"),
mkEntry(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, "dummy")
));
}

private static List<String> upgradeFromVersions() {
return new TestValidString(
(ConfigDef.ValidString) CONFIG.configKeys().get(StreamsConfig.UPGRADE_FROM_CONFIG).validator
).validStrings();
}

}
}