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Posted to mapreduce-dev@hadoop.apache.org by "smarthan (JIRA)" <ji...@apache.org> on 2018/04/09 15:40:00 UTC
[jira] [Created] (MAPREDUCE-7074) Shuffle get stuck in fetch
failures loop, when a few mapoutput were lost or corrupted and task timeout
was set to 0
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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