Anthony Hsu created MAPREDUCE-7131:
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Summary: Job History Server has race condition where it moves
files from intermediate to finished but thinks file is in intermediate
Key: MAPREDUCE-7131
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7131
Project: Hadoop Map/Reduce
Issue Type: Bug
Affects Versions: 2.7.4
Reporter: Anthony Hsu
This is the race condition that can occur:
# during the first *scanIntermediateDirectory()*,
*HistoryFileInfo.moveToDone()* is scheduled for job j1
# during the second *scanIntermediateDirectory()*, j1 is found again and put in
the *fileStatusList* to process
# *HistoryFileInfo.moveToDone()* is processed in another thread and history
files are moved to the finished directory
# the *HistoryFileInfo* for j1 is removed from *jobListCache*
# the j1 in *fileStatusList* is processed and a new *HistoryFileInfo* for j1 is
created (history, conf, and summary files will point to the intermediate user
directory, and state will be IN_INTERMEDIATE)
# *moveToDone()* is scheduled for this new j1
# *moveToDone()* fails during *moveToDoneNow()* for the history file because
the source path in the intermediate directory does not exist
>From this point on, while the new j1 *HistoryFileInfo* is in the
>*jobListCache*, the JobHistoryServer will think the history file is in the
>intermediate directory. If a user queries this job in the JobHistoryServer UI,
>they will get
{code}
org.apache.hadoop.yarn.exceptions.YarnRuntimeException: Could not load history
file
<scheme>://<host>:<port>/mr-history/intermediate/<user>/job_1529348381246_27275711-1535123223269-<user>-<jobname>-1535127026668-1-0-SUCCEEDED-<queue>-1535126980787.jhist
{code}
Noticed this issue while running 2.7.4, but the race condition seems to still
exist in trunk.
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