smarthan created MAPREDUCE-7074:
-----------------------------------
Summary: Shuffle get stuck in fetch failures loop, when a few
mapoutput were lost or corrupted and task timeout was set to 0
Key: MAPREDUCE-7074
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7074
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: mrv2, task
Affects Versions: 3.0.0, 2.8.0
Environment: cdh 5.10.0 , apache hadoop 2.8.0
Reporter: smarthan
Fix For: 2.8.0
Attachments: fetch_failures_report.patch
When a MR job like this:
- MR job with many map tasks, such as 10000 or more
- a few map output were lost or corrupted after map task complete successfully
and before shuffle start
- mapreduce.task.timeout was set to 0 and
mapreduce.task.progress-report.interval was not set
the shuffle of reduce task will get stuck in fetch failures loop for a long
time, several or even dozens of hours.
It was caused by MAPREDUCE-6740, it releate mapreduce.task.timeout with
mapreduce.task.progress-report.interval by
MRJobConfUtil.getTaskProgressReportInterval()
{code:java}
public static long getTaskProgressReportInterval(final Configuration conf) {
long taskHeartbeatTimeOut = conf.getLong(
MRJobConfig.TASK_TIMEOUT, MRJobConfig.DEFAULT_TASK_TIMEOUT_MILLIS);
return conf.getLong(MRJobConfig.TASK_PROGRESS_REPORT_INTERVAL,
(long) (TASK_REPORT_INTERVAL_TO_TIMEOUT_RATIO * taskHeartbeatTimeOut));
}
{code}
When mapreduce.task.timeout was set to 0 and
mapreduce.task.progress-report.interval was not set,
getTaskProgressReportInterval will retrun 0L.
In the class TaskReporter which is used to report task progress and status to
AM, it set taskProgressInterval= MRJobConfUtil.getTaskProgressReportInterval(),
and lock.wait(taskProgressInterval) before every progress report.
{code:java}
public void run() {
...skip...
long taskProgressInterval = MRJobConfUtil.
getTaskProgressReportInterval(conf);
while (!taskDone.get()) {
...skip...
try {
// sleep for a bit
synchronized(lock) {
if (taskDone.get()) {
break;
}
lock.wait(taskProgressInterval);
}
if (taskDone.get()) {
break;
}
if (sendProgress) {
// we need to send progress update
updateCounters();
taskStatus.statusUpdate(taskProgress.get(),
taskProgress.toString(),
counters);
taskFound = umbilical.statusUpdate(taskId, taskStatus);
taskStatus.clearStatus();
}
...skip...
}
...skip...
}
}
{code}
When mapreduce.task.timeout was set to 0, lock.wait(taskProgressInterval) will
be lock.wait(0), and because there is no operation to notify it ,the reporter
will wait all the time and don't report anything to AM.
So, when fetch failures happend in shuffle, TaskReporter will not report fetch
failures to AM , although the log of reducer show message"Reporting fetch
failure...", and the fetch failures loop will not stop util reduce task failed
for exceeded MAX_FAILED_UNIQUE_FETCHES.
So, it's necessary to set a TASK_PROGRESS_REPORT_INTERVAL_MAX value (such as
30s) when the taskProgressInterval return by
MRJobConfUtil.getTaskProgressReportInterval() equals 0 or beyond the max value,
set the taskProgressInterval = TASK_PROGRESS_REPORT_INTERVAL_MAX.
Exception Message:
{code:java}
2018-04-09 14:57:08,610 INFO [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.Fetcher: for
url=6562/mapOutput?job=job_1523233330039_13196&reduce=0&map=attempt_1523233330039_13196_m_003652_0,attempt_1523233330039_13196_m_001331_0,attempt_1523233330039_13196_m_000342_0,attempt_1523233330039_13196_m_000105_0,attempt_1523233330039_13196_m_001211_0,attempt_1523233330039_13196_m_002219_0,attempt_1523233330039_13196_m_004747_0,attempt_1523233330039_13196_m_000062_0
sent hash and received reply
2018-04-09 14:57:08,612 WARN [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.Fetcher: Invalid map id
java.lang.IllegalArgumentException: TaskAttemptId string : TTP/1.1 500 Internal
Server Error
Content-Type: text/plain; charset=UTF is not properly formed
at
org.apache.hadoop.mapreduce.TaskAttemptID.forName(TaskAttemptID.java:201)
at
org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyMapOutput(Fetcher.java:510)
at
org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyFromHost(Fetcher.java:348)
at org.apache.hadoop.mapreduce.task.reduce.Fetcher.run(Fetcher.java:198)
2018-04-09 14:57:08,612 WARN [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.Fetcher: copyMapOutput failed for tasks
[attempt_1523233330039_13196_m_003652_0,
attempt_1523233330039_13196_m_001331_0, attempt_1523233330039_13196_m_000342_0,
attempt_1523233330039_13196_m_000105_0, attempt_1523233330039_13196_m_001211_0,
attempt_1523233330039_13196_m_002219_0, attempt_1523233330039_13196_m_004747_0,
attempt_1523233330039_13196_m_000062_0]
2018-04-09 14:57:08,612 INFO [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl: Reporting fetch
failure for attempt_1523233330039_13196_m_003652_0 to jobtracker.
2018-04-09 14:57:08,612 INFO [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl: Reporting fetch
failure for attempt_1523233330039_13196_m_001331_0 to jobtracker.
2018-04-09 14:57:08,612 INFO [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl: Reporting fetch
failure for attempt_1523233330039_13196_m_000342_0 to jobtracker.
2018-04-09 14:57:08,612 INFO [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl: Reporting fetch
failure for attempt_1523233330039_13196_m_000105_0 to jobtracker.
2018-04-09 14:57:08,612 INFO [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl: Reporting fetch
failure for attempt_1523233330039_13196_m_001211_0 to jobtracker.
2018-04-09 14:57:08,612 INFO [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl: Reporting fetch
failure for attempt_1523233330039_13196_m_002219_0 to jobtracker.
2018-04-09 14:57:08,612 INFO [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl: Reporting fetch
failure for attempt_1523233330039_13196_m_004747_0 to jobtracker.
2018-04-09 14:57:08,612 INFO [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl: Reporting fetch
failure for attempt_1523233330039_13196_m_000062_0 to jobtracker.
...
2018-04-09 22:51:02,142 INFO [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.Fetcher: for
url=6562/mapOutput?job=job_1523233330039_13196&reduce=0&map=attempt_1523233330039_13196_m_003652_0,attempt_1523233330039_13196_m_001331_0,attempt_1523233330039_13196_m_000342_0,attempt_1523233330039_13196_m_000105_0,attempt_1523233330039_13196_m_001211_0,attempt_1523233330039_13196_m_002219_0,attempt_1523233330039_13196_m_004747_0,attempt_1523233330039_13196_m_000062_0
sent hash and received reply
2018-04-09 22:51:02,154 WARN [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.Fetcher: Invalid map id
java.lang.IllegalArgumentException: TaskAttemptId string : TTP/1.1 500 Internal
Server Error
Content-Type: text/plain; charset=UTF is not properly formed
at org.apache.hadoop.mapreduce.TaskAttemptID.forName(TaskAttemptID.java:201)
at
org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyMapOutput(Fetcher.java:510)
at
org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyFromHost(Fetcher.java:348)
at org.apache.hadoop.mapreduce.task.reduce.Fetcher.run(Fetcher.java:198)
2018-04-09 22:51:02,156 WARN [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.Fetcher: copyMapOutput failed for tasks
[attempt_1523233330039_13196_m_003652_0,
attempt_1523233330039_13196_m_001331_0, attempt_1523233330039_13196_m_000342_0,
attempt_1523233330039_13196_m_000105_0, attempt_1523233330039_13196_m_001211_0,
attempt_1523233330039_13196_m_002219_0, attempt_1523233330039_13196_m_004747_0,
attempt_1523233330039_13196_m_000062_0]
2018-04-09 22:51:02,157 INFO [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl: Reporting fetch
failure for attempt_1523233330039_13196_m_003652_0 to jobtracker.
2018-04-09 22:51:02,157 INFO [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl: Reporting fetch
failure for attempt_1523233330039_13196_m_001331_0 to jobtracker.
2018-04-09 22:51:02,157 INFO [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl: Reporting fetch
failure for attempt_1523233330039_13196_m_000342_0 to jobtracker.
2018-04-09 22:51:02,157 INFO [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl: Reporting fetch
failure for attempt_1523233330039_13196_m_000105_0 to jobtracker.
2018-04-09 22:51:02,157 INFO [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl: Reporting fetch
failure for attempt_1523233330039_13196_m_001211_0 to jobtracker.
2018-04-09 22:51:02,157 INFO [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl: Reporting fetch
failure for attempt_1523233330039_13196_m_002219_0 to jobtracker.
2018-04-09 22:51:02,157 INFO [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl: Reporting fetch
failure for attempt_1523233330039_13196_m_004747_0 to jobtracker.
2018-04-09 22:51:02,157 INFO [fetcher#3]
org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl: Reporting fetch
failure for attempt_1523233330039_13196_m_000062_0 to jobtracker.
{code}
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