Timothy Farkas created DRILL-6325:
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Summary: Memory usage stats may not be updated correctly for an
operator.
Key: DRILL-6325
URL: https://issues.apache.org/jira/browse/DRILL-6325
Project: Apache Drill
Issue Type: Bug
Reporter: Timothy Farkas
Assignee: Timothy Farkas
The memory usage stats for an operator in a query profile may not be up to
date, even after the query is completed. This is caused by two possible issues:
1 Memory usage is polled by a thread once every 5 seconds. However the final
memory usage of the operator may not be reported if the operator completes
before the next polling cycle.
2 There is a race condition in the Foreman where one thread sets the metrics on
an object and another thread reads the metrics object to include in a query
profile. The thread that reads the metrics object may read old metrics since
access to the variable is not synchronized.
There are two fixes for this
1 Poll the stats one more time after the fragment root completes but before the
operator is closed.
2 Synchronize the methods on the FragmentData class.
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