[jira] [Resolved] (FLINK-37870) Unaligned checkpoint is disabled for all connections unexpectedly

["Rui Fan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-37870?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rui Fan resolved FLINK-37870.
-----------------------------
    Resolution: Fixed

> Unaligned checkpoint is disabled for all connections unexpectedly
> -----------------------------------------------------------------
>
>                 Key: FLINK-37870
>                 URL: https://issues.apache.org/jira/browse/FLINK-37870
>             Project: Flink
>          Issue Type: Bug
>          Components: Runtime / Checkpointing
>    Affects Versions: 2.0.0, 1.19.2, 1.20.1
>            Reporter: Rui Fan
>            Assignee: Rui Fan
>            Priority: Critical
>              Labels: pull-request-available
>             Fix For: 1.19.3, 2.1.0, 2.0.1, 1.20.3
>
>
> FLINK-36287 would disable unaligned checkpoint between {color:#172b4d}the sink writer and committer, but it disabled unaligned checkpoint for all connections of the entire DAG.{color}
> h2. {color:#172b4d}Reason:{color}
> [https://github.com/apache/flink/blob/a4e3084ab9220b02bc3eefc70ea372251aec7f07/flink-runtime/src/main/java/org/apache/flink/streaming/runtime/translators/SinkTransformationTranslator.java#L226]
> *_Set<Integer> seen = new HashSet<>(writer.getId());_* creates a HashSet to record all seen transformations. It expects to create a HashSet and put the first writer transformation into the set to end the recursive loop (to prevent traversing the previous transformation of the writer).
> But the constructor parameter of new HashSet is initialCapacity, so it only created a HashSet, and didn't put the first writer transformation into the set.



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