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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 12:21:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16348495#comment-16348495
] 

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_r165340438
  
    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/state/filesystem/FsStateBackend.java
---
    @@ -501,4 +529,53 @@ public String toString() {
     				"', asynchronous: " + asynchronousSnapshots +
     				", fileStateThreshold: " + fileStateThreshold + ")";
     	}
    +
    +	/**
    +	 * This enum represents the different modes for local recovery.
    +	 */
    +	public enum LocalRecoveryMode {
    +		DISABLED, ENABLE_FILE_BASED, ENABLE_HEAP_BASED
    +	}
    +
    +	/**
    +	 * This class encapsulates the configuration for local recovery of this backend.
    +	 */
    +	public static final class LocalRecoveryConfig implements Serializable {
    +
    +		private static final long serialVersionUID = 1L;
    +		private static final LocalRecoveryConfig DISABLED_SINGLETON =
    +			new LocalRecoveryConfig(LocalRecoveryMode.DISABLED, null);
    +
    +		private final LocalRecoveryMode localRecoveryMode;
    +		private final File localStateDirectory;
    +
    +		LocalRecoveryConfig(LocalRecoveryMode localRecoveryMode, File localStateDirectory)
{
    +			this.localRecoveryMode = Preconditions.checkNotNull(localRecoveryMode);
    +			this.localStateDirectory = localStateDirectory;
    +			if (LocalRecoveryMode.ENABLE_FILE_BASED.equals(localRecoveryMode) && localStateDirectory
== null) {
    +				throw new IllegalStateException("Local state directory must be specified if local
recovery mode is " +
    +					LocalRecoveryMode.ENABLE_FILE_BASED);
    +			}
    +		}
    +
    +		public LocalRecoveryMode getLocalRecoveryMode() {
    +			return localRecoveryMode;
    +		}
    +
    +		public File getLocalStateDirectory() {
    +			return localStateDirectory;
    --- End diff --
    
    How does this play together with `ENABLE_HEAP_BASED` `LocalRecoveryMode`?


> 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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