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https://issues.apache.org/jira/browse/TEZ-2217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14377118#comment-14377118
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Bikas Saha commented on TEZ-2217:
---------------------------------
This may help in setting debug logs for only 1 class
{noformat} /**
* Root Logging level passed to the Tez app master.
*
* Simple configuration: Set the log level for all loggers.
* e.g. INFO
* This sets the log level to INFO for all loggers.
*
* Advanced configuration: Set the log level for all classes, along with a
different level for some.
* e.g. DEBUG;org.apache.hadoop.ipc=INFO;org.apache.hadoop.security=INFO
* This sets the log level for all loggers to DEBUG, expect for the
* org.apache.hadoop.ipc and org.apache.hadoop.security, which are set to
INFO
*
* Note: The global log level must always be the first parameter.
* DEBUG;org.apache.hadoop.ipc=INFO;org.apache.hadoop.security=INFO is valid
* org.apache.hadoop.ipc=INFO;org.apache.hadoop.security=INFO is not valid
* */
@ConfigurationScope(Scope.AM)
public static final String TEZ_AM_LOG_LEVEL = TEZ_AM_PREFIX + "log.level";
public static final String TEZ_AM_LOG_LEVEL_DEFAULT = "INFO";
{noformat}
> 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-2217.1.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.
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