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ASF GitHub Bot commented on FLINK-8360: --------------------------------------- Github user StefanRRichter commented on a diff in the pull request: https://github.com/apache/flink/pull/5239#discussion_r168176306 --- 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 -- All this is changed a bit later, bit in essence the backend simply does not ask for the directory if nothing file-based is used. > 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. -- This message was sent by Atlassian JIRA (v7.6.3#76005)