Gergo Repas created YARN-8273:
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Summary: Log aggregation does not warn if HDFS quota in target
directory is exceeded
Key: YARN-8273
URL: https://issues.apache.org/jira/browse/YARN-8273
Project: Hadoop YARN
Issue Type: Bug
Components: log-aggregation
Affects Versions: 3.1.0
Reporter: Gergo Repas
Assignee: Gergo Repas
It appears that if an HDFS space quota is set on a target directory for log
aggregation and the quota is already exceeded when log aggregation is
attempted, zero-byte log files will be written to the HDFS directory, however
NodeManager logs do not reflect a failure to write the files successfully (i.e.
there are no ERROR or WARN messages to this effect).
An improvement may be worth investigating to alert users to this scenario, as
otherwise logs for a YARN application may be missing both on HDFS and locally
(after local log cleanup is done) and the user may not otherwise be informed.
Steps to reproduce:
* Set a small HDFS space quota on /tmp/logs/username/logs (e.g. 2MB)
* Write files to HDFS such that /tmp/logs/username/logs is almost 2MB full
* Run a Spark or MR job in the cluster
* Observe that zero byte files are written to HDFS after job completion
* Observe that YARN container logs are also not present on the NM hosts (or are
deleted after yarn.nodemanager.delete.debug-delay-sec)
* Observe that no ERROR or WARN messages appear to be logged in the NM role log
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