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https://issues.apache.org/jira/browse/MAPREDUCE-6514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15273533#comment-15273533
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Hudson commented on MAPREDUCE-6514:
-----------------------------------
FAILURE: Integrated in Hadoop-trunk-Commit #9728 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/9728/])
MAPREDUCE-6514. Fixed MapReduce ApplicationMaster to properly updated (vinodkv:
rev 8d48266720dcf0e71cfd87fef18b60a53aa1bef9)
*
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/rm/RMContainerRequestor.java
*
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/rm/TestRMContainerAllocator.java
*
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/rm/RMContainerAllocator.java
> Job hangs as ask is not updated after ramping down of all reducers
> ------------------------------------------------------------------
>
> Key: MAPREDUCE-6514
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6514
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: applicationmaster
> Reporter: Varun Saxena
> Assignee: Varun Saxena
> Priority: Blocker
> Attachments: MAPREDUCE-6514.01.patch, MAPREDUCE-6514.02.patch
>
>
> In RMContainerAllocator#preemptReducesIfNeeded, we simply clear the scheduled
> reduces map and put these reducers to pending. This is not updated in ask. So
> RM keeps on assigning and AM is not able to assign as no reducer is
> scheduled(check logs below the code).
> If this is updated immediately, RM will be able to schedule mappers
> immediately which anyways is the intention when we ramp down reducers.
> Scheduler need not allocate for ramped down reducers
> This if not handled can lead to map starvation as pointed out in
> MAPREDUCE-6513
> {code}
> LOG.info("Ramping down all scheduled reduces:"
> + scheduledRequests.reduces.size());
> for (ContainerRequest req : scheduledRequests.reduces.values()) {
> pendingReduces.add(req);
> }
> scheduledRequests.reduces.clear();
> {code}
> {noformat}
> 2015-10-13 04:55:04,912 INFO [RMCommunicator Allocator]
> org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Container not
> assigned : container_1437451211867_1485_01_000215
> 2015-10-13 04:55:04,912 INFO [RMCommunicator Allocator]
> org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Cannot assign
> container Container: [ContainerId: container_1437451211867_1485_01_000216,
> NodeId: hdszzdcxdat6g06u04p:26009, NodeHttpAddress:
> hdszzdcxdat6g06u04p:26010, Resource: <memory:4096, vCores:1>, Priority: 10,
> Token: Token { kind: ContainerToken, service: 10.2.33.236:26009 }, ] for a
> reduce as either container memory less than required 4096 or no pending
> reduce tasks - reduces.isEmpty=true
> 2015-10-13 04:55:04,912 INFO [RMCommunicator Allocator]
> org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Container not
> assigned : container_1437451211867_1485_01_000216
> 2015-10-13 04:55:04,912 INFO [RMCommunicator Allocator]
> org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Cannot assign
> container Container: [ContainerId: container_1437451211867_1485_01_000217,
> NodeId: hdszzdcxdat6g06u06p:26009, NodeHttpAddress:
> hdszzdcxdat6g06u06p:26010, Resource: <memory:4096, vCores:1>, Priority: 10,
> Token: Token { kind: ContainerToken, service: 10.2.33.239:26009 }, ] for a
> reduce as either container memory less than required 4096 or no pending
> reduce tasks - reduces.isEmpty=true
> {noformat}
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