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Posted to issues@flink.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/05/22 09:07:00 UTC
[jira] [Updated] (FLINK-17861) Channel state handles, when inlined,
duplicate underlying data
[ https://issues.apache.org/jira/browse/FLINK-17861?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ASF GitHub Bot updated FLINK-17861:
-----------------------------------
Labels: pull-request-available (was: )
> Channel state handles, when inlined, duplicate underlying data
> --------------------------------------------------------------
>
> Key: FLINK-17861
> URL: https://issues.apache.org/jira/browse/FLINK-17861
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Checkpointing, Runtime / Task
> Affects Versions: 1.11.0
> Reporter: Roman Khachatryan
> Assignee: Roman Khachatryan
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.11.0
>
>
> When a subtask snapshots its state it creates one channelStateHandle per inputChannel/resultSubpartition. All handles of a single subtask share the underlying streamStateHandle. This is an optimisation to prevent having too many files.
> But if streamStateHandle is inlined (size < state.backend.fs.memory-threshold) then most of the bytes in the underlying streamStateHandle are duplicated.
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