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Gopal V commented on TEZ-2217: ------------------------------ [~bikassaha]: The patch keeps containers alive, which works better with this patch. There's a lot of log-spew with {{LOG.info("Holding onto idle container with no work. CId: "}} in the _post log files. I might take a couple of days to reviewing this, so If [~rajesh.balamohan] can spare some time to review this, we can get this in quickly. > The min-held-containers constraint is not enforced during query runtime > ------------------------------------------------------------------------ > > Key: TEZ-2217 > URL: https://issues.apache.org/jira/browse/TEZ-2217 > Project: Apache Tez > Issue Type: Bug > Affects Versions: 0.6.0, 0.7.0 > Reporter: Gopal V > Assignee: Bikas Saha > Attachments: TEZ-2217-debug.txt.bz2, TEZ-2217.1.patch, > TEZ-2217.2.patch, TEZ-2217.3.patch, TEZ-2217.txt.bz2 > > > The min-held containers constraint is respected during query idle times, but > is not respected when a query is actually in motion. > The AM releases unused containers during dag execution without checking for > min-held containers. > {code} > 2015-03-20 15:41:53,475 INFO [DelayedContainerManager] > rm.YarnTaskSchedulerService: Container's idle timeout expired. Releasing > container, containerId=container_1424502260528_1348_01_000013, > containerExpiryTime=1426891313264, idleTimeoutMin=5000 > 2015-03-20 15:41:53,475 INFO [DelayedContainerManager] > rm.YarnTaskSchedulerService: Releasing unused container: > container_1424502260528_1348_01_000013 > {code} > This is actually useful only after the AM has received a soft pre-emption > message, doing it on an idle cluster slows down one of the most common query > patterns in BI systems. > {code} > create temporary table smalltable as ...; > select ... bigtable JOIN smalltable ON ...; > {code} > The smaller query in the beginning throws away the pre-warmed capacity. -- This message was sent by Atlassian JIRA (v6.3.4#6332)