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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9938) State TTL cleanup during full state scan upon checkpointing
Date Fri, 03 Aug 2018 14:37:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16568263#comment-16568263

ASF GitHub Bot commented on FLINK-9938:

azagrebin commented on a change in pull request #6460: [FLINK-9938] Clean up full snapshot
from expired state with TTL
URL: https://github.com/apache/flink/pull/6460#discussion_r207565319

 File path: flink-runtime/src/main/java/org/apache/flink/runtime/state/ttl/TtlStateFactory.java
 @@ -176,10 +179,23 @@ private TtlStateFactory(KeyedStateFactory originalStateFactory, StateTtlConfigur
 			new TtlFoldFunction<>(foldingStateDescriptor.getFoldFunction(), ttlConfig, timeProvider,
 			new TtlSerializer<>(stateDesc.getSerializer()));
 		return (IS) new TtlFoldingState<>(
-			originalStateFactory.createInternalState(namespaceSerializer, ttlDescriptor),
+			originalStateFactory.createInternalState(namespaceSerializer, ttlDescriptor, getSnapshotFilter()),
 			ttlConfig, timeProvider, stateDesc.getSerializer());
+	@SuppressWarnings("unchecked")
+	private <TTLV> StateSnapshotFilter<TTLV> getSnapshotFilter() {
+		if (!ttlConfig.getCleanupStrategies().inFullSnapshot()) {
+			return StateSnapshotFilter.snapshotAll();
+		} else if (stateDesc instanceof ListStateDescriptor) {
 Review comment:
   I think, it is better to keep state descriptors only for user config.

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> State TTL cleanup during full state scan upon checkpointing
> -----------------------------------------------------------
>                 Key: FLINK-9938
>                 URL: https://issues.apache.org/jira/browse/FLINK-9938
>             Project: Flink
>          Issue Type: Improvement
>          Components: State Backends, Checkpointing
>    Affects Versions: 1.6.0
>            Reporter: Andrey Zagrebin
>            Assignee: Andrey Zagrebin
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.6.0
> We can try to piggyback full state scan during certain checkpoint processes in backends,
check TTL expiration for every entry and evict expired to speed up cleanup.

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