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https://issues.apache.org/jira/browse/FLINK-15253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16995960#comment-16995960
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Seth Wiesman commented on FLINK-15253:
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I kind of like accumulators. I think of them as the println debugging of
metrics in Flink. I use them when I need to troubleshoot a job and I'm not sure
where I'm looking but agreed that they are not appropriate for production
streaming applications.
> Accumulators are not checkpointed
> ---------------------------------
>
> Key: FLINK-15253
> URL: https://issues.apache.org/jira/browse/FLINK-15253
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Checkpointing
> Reporter: Maximilian Michels
> Priority: Major
>
> Accumulators are not checkpointed which make them relatively useless for
> streaming applications. They are also tight to the heartbeat (FLINK-15252),
> which makes them fragile.
> We could consider deactivating accumulators in streaming mode since they seem
> to originally be a batch feature.
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