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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-8360) Implement task-local state recovery
Date Thu, 11 Jan 2018 14:26:04 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16322296#comment-16322296
] 

ASF GitHub Bot commented on FLINK-8360:
---------------------------------------

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

    https://github.com/apache/flink/pull/5239#discussion_r160941763
  
    --- Diff: flink-runtime/src/test/java/org/apache/flink/runtime/taskexecutor/TaskExecutorTest.java
---
    @@ -210,10 +211,11 @@ public void testHeartbeatTimeoutWithJobManager() throws Exception
{
     			tmConfig,
     			taskManagerLocation,
     			mock(MemoryManager.class),
    -			mock(IOManager.class),
    +			mock(IOManager.class),mock(TaskExecutorLocalStateStoresManager.class),
    --- End diff --
    
    Can all of the `mock(TaskExecutorLocalStateStoresManager.class)` be replaced with: `new
TaskExecutorLocalStateStoresManager();` (with an empty array of for `localStateRootDirectories`)
or maybe `new TaskExecutorLocalStateStoresManager(sameThreadExecutor());`?


> 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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