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https://issues.apache.org/jira/browse/FLINK-8360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16348463#comment-16348463
]
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_r165331645
--- Diff:
flink-contrib/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBStateBackend.java
---
@@ -686,4 +714,53 @@ static void resetRocksDBLoadedFlag() throws Exception {
initField.setAccessible(true);
initField.setBoolean(null, false);
}
+
+ /**
+ * This enum represents the different modes for local recovery.
+ */
+ public enum LocalRecoveryMode {
+ DISABLED, ENABLE_FILE_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() {
--- End diff --
@Nullable
> 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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