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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-8360) Implement task-local state recovery
Date Fri, 05 Jan 2018 14:03:01 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16313144#comment-16313144

ASF GitHub Bot commented on FLINK-8360:

Github user pnowojski commented on a diff in the pull request:

    --- Diff: flink-contrib/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBKeyedStateBackend.java
    @@ -1041,7 +1045,13 @@ public void restore(Collection<KeyedStateHandle> restoreState)
throws Exception
     	public void notifyCheckpointComplete(long completedCheckpointId) {
    +		if (!enableIncrementalCheckpointing) {
    --- End diff --
    1. Is this change relevant to the commit? If not please extract it to separate one.
    2. Why we do not need to handle notify for disabled incremental checkpointing? Doesn't
it deserve some explanation in form of a comment?

> Implement task-local state recovery
> -----------------------------------
>                 Key: FLINK-8360
>                 URL: https://issues.apache.org/jira/browse/FLINK-8360
>             Project: Flink
>          Issue Type: New Feature
>          Components: State Backends, Checkpointing
>            Reporter: Stefan Richter
>            Assignee: Stefan Richter
>             Fix For: 1.5.0
> This issue tracks the development of recovery from task-local state. The main idea is
to have a secondary, local copy of the checkpointed state, while there is still a primary
copy in DFS that we report to the checkpoint coordinator.
> Recovery can attempt to restore from the secondary local copy, if available, to save
network bandwidth. This requires that the assignment from tasks to slots is as sticky is possible.
> For starters, we will implement this feature for all managed keyed states and can easily
enhance it to all other state types (e.g. operator state) later.

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