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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7213) Introduce state management by OperatorID in TaskManager
Date Sun, 30 Jul 2017 22:03:01 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16106672#comment-16106672

ASF GitHub Bot commented on FLINK-7213:

Github user StefanRRichter commented on the issue:

    BTW, one alternative I was once considering for the scale down case is merging state handles
that are backed by different physical files in one logical state handle, using something based
on `MultiStreamStateHandle`. That would require minor changes in how the backends currently
iterate the handles and some calculation of virtual offsets near the `StateAssignmentOperation`,
mapping the old physical file offsets to the new logical offsets in the stream that gives
a consecutive logical view over the files. Then, the whole code would never again deal with
this detail. Wonder if this is worth the effort?

> Introduce state management by OperatorID in TaskManager
> -------------------------------------------------------
>                 Key: FLINK-7213
>                 URL: https://issues.apache.org/jira/browse/FLINK-7213
>             Project: Flink
>          Issue Type: Improvement
>          Components: State Backends, Checkpointing
>    Affects Versions: 1.4.0
>            Reporter: Stefan Richter
>            Assignee: Stefan Richter
> Flink-5892 introduced the job manager / checkpoint coordinator part of managing state
on the operator level instead of the task level by introducing explicit operator_id ->
state mappings. However, this explicit mapping was not introduced in the task manager side,
so the explicit mapping is still converted into a mapping that suits the implicit operator
chain order.
> We should also introduce explicit operator ids to state management on the task manager.

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