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https://issues.apache.org/jira/browse/FLINK-8360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16365820#comment-16365820
]
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_r168526712
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/state/TaskExecutorLocalStateStoresManager.java
---
@@ -20,35 +20,47 @@
import org.apache.flink.annotation.VisibleForTesting;
import org.apache.flink.api.common.JobID;
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
import org.apache.flink.runtime.jobgraph.JobVertexID;
-import org.apache.flink.util.ExceptionUtils;
-import org.apache.flink.util.Preconditions;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.annotation.Nonnegative;
import javax.annotation.Nonnull;
import java.io.File;
-import java.util.HashMap;
import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.Executor;
/**
* This class holds the all {@link TaskLocalStateStore} objects for a task
executor (manager).
- *
- * TODO: this still still work in progress and partially still acts as a
placeholder.
*/
public class TaskExecutorLocalStateStoresManager {
+ /** Logger for this class. */
+ private static final Logger LOG =
LoggerFactory.getLogger(TaskExecutorLocalStateStoresManager.class);
+
/**
* This map holds all local state stores for tasks running on the task
manager / executor that own the instance of
- * this.
+ * this. Maps from allocation id to all the subtask's local state
stores.
*/
- private final Map<JobID, Map<JobVertexSubtaskKey, TaskLocalStateStore>>
taskStateStoresByJobID;
+ private final Map<AllocationID, Map<JobVertexSubtaskKey,
TaskLocalStateStore>> taskStateStoresByAllocationID;
--- End diff --
In a later commit, this user a normal `HashMap` and synchronization.
> 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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