Tamas Domok created YARN-11578:
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Summary: Fix performance issue of permission check in
verifyAndCreateRemoteLogDir
Key: YARN-11578
URL: https://issues.apache.org/jira/browse/YARN-11578
Project: Hadoop YARN
Issue Type: Bug
Reporter: Tamas Domok
Assignee: Tamas Domok
YARN-10901 introduced a check to avoid a warn message in NN logs in certain
situations (when /tmp/logs is not owned by the yarn user), but it adds 3
NameNode calls (create, setpermission, delete) during log aggregation
collection, for *every* NM. Meaning, when a YARN job completes, at the YARN log
aggregation phase this check is done for every job, from every NodeManager.
In 30 minutes 4.2 % of all the NameNode calls were due to this in a cluster.
"write" calls need a Namesystem writeLock as well, so the impact is bigger.
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