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https://issues.apache.org/jira/browse/DRILL-4146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15032876#comment-15032876
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ASF GitHub Bot commented on DRILL-4146:
---------------------------------------
GitHub user amansinha100 opened a pull request:
https://github.com/apache/drill/pull/285
DRILL-4146: Concurrent queries hang in planner. Fix is in Calcite (C…
…ALCITE-874).
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/amansinha100/incubator-drill hashfunc2
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/285.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #285
----
commit 39a11b8ae1e103b9a1e9c141918023ead5361e46
Author: Aman Sinha <[email protected]>
Date: 2015-12-01T01:48:46Z
DRILL-4146: Concurrent queries hang in planner. Fix is in Calcite
(CALCITE-874).
----
> Concurrent queries hang in planner in ReflectiveRelMetadataProvider
> -------------------------------------------------------------------
>
> Key: DRILL-4146
> URL: https://issues.apache.org/jira/browse/DRILL-4146
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Affects Versions: 1.3.0
> Reporter: Aman Sinha
> Assignee: Aman Sinha
> Fix For: 1.4.0
>
>
> At concurrency levels of 30 or more for certain workloads we have seen
> queries hang in the planning phase in Calcite. The top of the jstack is
> shown below:
> {noformat}
> "29b47a17-6ef3-4b7f-98e7-a7c1a702c32f:foreman" daemon prio=10
> tid=0x00007f55484a1800 nid=0x289a runnable [0x00007f54b4369000]
> java.lang.Thread.State: RUNNABLE
> at java.util.HashMap.getEntry(HashMap.java:465)
> at java.util.HashMap.get(HashMap.java:417)
> at
> org.apache.calcite.rel.metadata.ReflectiveRelMetadataProvider.apply(ReflectiveRelMetadataProvider.java:251)
> at
> org.apache.calcite.rel.metadata.ChainedRelMetadataProvider.apply(ChainedRelMetadataProvider.java:60)
> at
> org.apache.calcite.rel.metadata.ChainedRelMetadataProvider.apply(ChainedRelMetadataProvider.java:60)
> {noformat}
>
> After some investigations, we found that this issue was actually addressed by
> CALCITE-874 (ReflectiveRelMetadataProvider is not thread-safe). This JIRA
> is a placeholder to merge that Calcite fix since Drill is currently not
> up-to-date with Calcite and there is an immediate need for running queries in
> a high concurrency environment.
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