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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-8360) Implement task-local state recovery
Date Thu, 01 Feb 2018 12:31:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16348510#comment-16348510
] 

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

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

    https://github.com/apache/flink/pull/5239#discussion_r165342341
  
    --- Diff: flink-runtime/src/test/java/org/apache/flink/runtime/state/TaskStateManagerImplTest.java
---
    @@ -97,6 +104,39 @@ public void testStateReportingAndRetrieving() {
     		Assert.assertNull(taskStateManager.operatorStates(operatorID_3));
     	}
     
    +	/**
    +	 * This tests if the {@link TaskStateManager} properly returns the the subtask local
state dir from the
    +	 * corresponding {@link TaskLocalStateStore}.
    +	 */
    +	@Test
    +	public void testForwardingSubtaskLocalStateBaseDirFromLocalStateStore() throws IOException
{
    +		JobID jobID = new JobID(42L, 43L);
    +		JobVertexID jobVertexID = new JobVertexID(12L, 34L);
    +		ExecutionAttemptID executionAttemptID = new ExecutionAttemptID(23L, 24L);
    +		TestCheckpointResponder checkpointResponderMock = new TestCheckpointResponder();
    +
    +		TemporaryFolder tmpFolder = new TemporaryFolder();
    --- End diff --
    
    Maybe `ClassRule`?


> 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
>            Priority: Major
>             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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