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https://issues.apache.org/jira/browse/KYLIN-4657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17163311#comment-17163311
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QiangZhang commented on KYLIN-4657:
-----------------------------------
h2. Cause Analysis
# job run at org.apache.kylin.engine.mr.common.MapReduceExecutable#doWork
# HadoopJobStatusChecker.checkStatus at MapReduceExecutable.java:153，for some
reason ，checkStatus error and error was catched in checkStatus method
# HadoopCmdOutput.getInfo at MapReduceExecutable.java:163 ,for some reason
,getInfo error so a execption was thrown . And doWork method return.
# If user has enable Job Retry (_+kylin.job.retry+_), so job will retry again.
# job = new
Cluster(conf).getJob(JobID.forName(extra.get(ExecutableConstants.MR_JOB_ID)))
at MapReduceExecutable.java:120，if last run job status is SUCCEEDED，will
redirecting to job history server to getJob，for some reason，getJob failed and
job is null.
# when job is null，the while loop will became dead-loop
> dead-loop in org.apache.kylin.engine.mr.common.MapReduceExecutable.doWork
> -------------------------------------------------------------------------
>
> Key: KYLIN-4657
> URL: https://issues.apache.org/jira/browse/KYLIN-4657
> Project: Kylin
> Issue Type: Bug
> Components: Job Engine
> Affects Versions: all
> Reporter: QiangZhang
> Priority: Major
> Attachments: image-2020-07-23-14-54-02-079.png,
> image-2020-07-23-14-58-49-140.png, image-2020-07-23-15-08-45-493.png,
> image-2020-07-23-15-18-48-058.png, image-2020-07-23-15-20-05-764.png
>
>
> ||issue||
> |Kylin job in step3("Extract Fact Table Distinct Columns") is always running|
>
> ----
> 1.when this job is run for the first time：
> !image-2020-07-23-14-54-02-079.png!
> 2.If user has enable Job Retry (_+kylin.job.retry+_), so job will retry again
> !image-2020-07-23-14-58-49-140.png!
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