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https://issues.apache.org/jira/browse/DRILL-4146?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aman Sinha resolved DRILL-4146.
-------------------------------
Resolution: Fixed
Fixed in 53e7a696f
> 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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