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https://issues.apache.org/jira/browse/MAPREDUCE-7253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17013996#comment-17013996
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shilongfei commented on MAPREDUCE-7253:
---------------------------------------
The log of this failed map is as follows. The first attempt is scheduled at
9:46, the resource is allocated at 9:50, the second attempt is scheduled at
9:52, and no subsequent resources are allocated.
{code:java}
2020-01-02 09:46:14,181 INFO [AsyncDispatcher event handler]
org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl:
attempt_1577272892024_639901_m_007585_0 TaskAttempt Transitioned from NEW to
UNASSIGNED
2020-01-02 09:50:11,102 INFO [AsyncDispatcher event handler]
org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl:
attempt_1577272892024_639901_m_007585_0 TaskAttempt Transitioned from
UNASSIGNED to ASSIGNED
2020-01-02 09:50:11,146 INFO [AsyncDispatcher event handler]
org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl:
attempt_1577272892024_639901_m_007585_0 TaskAttempt Transitioned from ASSIGNED
to RUNNING
2020-01-02 09:52:11,944 INFO [AsyncDispatcher event handler]
org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl:
attempt_1577272892024_639901_m_007585_1 TaskAttempt Transitioned from NEW to
UNASSIGNED
{code}
>From the AM allocation container log, it can be seen that the first attempt to
>the current map is assigned to the container at 9:50, and the second attempt
>has not been
{code:java}
2020-01-02 09:46:16,377 INFO [RMCommunicator Allocator]
org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Assigned container
container_e922_1577272892024_639901_01_000002 to
attempt_1577272892024_639901_m_000250_0
2020-01-02 09:46:16,379 INFO [RMCommunicator Allocator]
org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Assigned container
container_e922_1577272892024_639901_01_000003 to
attempt_1577272892024_639901_m_000839_0
......
2020-01-02 09:50:11,095 INFO [RMCommunicator Allocator]
org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Assigned container
container_e922_1577272892024_639901_01_016146 to
attempt_1577272892024_639901_m_007585_0
......
{code}
Looking at the container application log, it can be found that after 9:52 AM
has applied for resources, but there is no second attempt allocated to the map.
{code:java}
2020-01-02 09:52:30,084 INFO [RMCommunicator Allocator]
org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Got allocated
containers 1
2020-01-02 09:52:31,093 INFO [RMCommunicator Allocator]
org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Got allocated
containers 3
2020-01-02 09:52:33,110 INFO [RMCommunicator Allocator]
org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Got allocated
containers 1
2020-01-02 09:52:34,119 INFO [RMCommunicator Allocator]
org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Got allocated
containers 1
2020-01-02 09:55:11,234 INFO [RMCommunicator Allocator]
org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Got allocated
containers 1
{code}
The requested resources are allocated to reduce
{code:java}
2020-01-02 09:52:31,093 INFO [RMCommunicator Allocator]
org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Assigned to reduce
2020-01-02 09:52:33,110 INFO [RMCommunicator Allocator]
org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Assigned to reduce
2020-01-02 09:52:34,119 INFO [RMCommunicator Allocator]
org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Assigned to reduce
2020-01-02 09:55:11,234 INFO [RMCommunicator Allocator]
org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Assigned to
reduce{code}
Because the timeout event does not carry the rescheduler flag
{code:java}
if(taskTimedOut) {
// task is lost, remove from the list and raise lost event
iterator.remove();
eventHandler.handle(new TaskAttemptDiagnosticsUpdateEvent(entry
.getKey(), "AttemptID:" + entry.getKey().toString()
+ " Timed out after " + taskTimeOut / 1000 + " secs"));
eventHandler.handle(new TaskAttemptEvent(entry.getKey(),
TaskAttemptEventType.TA_TIMED_OUT));
}{code}
> MR job got hanged forever when map task timeout
> -----------------------------------------------
>
> Key: MAPREDUCE-7253
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7253
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: shilongfei
> Priority: Major
> Attachments: 2020-01-02 11-15-42屏幕截图.png, 2020-01-02
> 11-15-58屏幕截图.png, 2020-01-02 11-16-14屏幕截图.png
>
>
> When the MR map job fails and the reduce job has started to be scheduled, the
> failed map will not be scheduled, it will always be in the NEW state, and the
> reduce job will also be blocked.
> So why was the map job not scheduled in time? !2020-01-02 11-15-58屏幕截图.png!
> !2020-01-02 11-15-42屏幕截图.png!
> !2020-01-02 11-16-14屏幕截图.png!
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