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https://issues.apache.org/jira/browse/KUDU-3019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16995364#comment-16995364
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Todd Lipcon commented on KUDU-3019:
-----------------------------------
What version are you seeing this on and what did you set the timeouts to, if
not default? Timeouts are handled by the async code so no timeout should be
needed on the join that converts the async call to sync.
Are you able to repro?
> Kudu client hangs in Deffered.join()
> ------------------------------------
>
> Key: KUDU-3019
> URL: https://issues.apache.org/jira/browse/KUDU-3019
> Project: Kudu
> Issue Type: Bug
> Reporter: Zoltán Borók-Nagy
> Priority: Major
>
> In Impala we've seen the Kudu client hanging with the following stack trace:
> {noformat}
> Thread 53015: (state = BLOCKED)
> - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
> imprecise)
> - java.lang.Object.wait() @bci=2, line=502 (Compiled frame)
> - com.stumbleupon.async.Deferred.doJoin(boolean, long) @bci=77, line=1122
> (Compiled frame)
> - com.stumbleupon.async.Deferred.join() @bci=3, line=1006 (Compiled frame)
> -
> org.apache.kudu.client.KuduClient.joinAndHandleException(com.stumbleupon.async.Deferred)
> @bci=1, line=340 (Compiled frame)
> - org.apache.kudu.client.KuduClient.openTable(java.lang.String) @bci=10,
> line=212 (Compiled frame)
> -
> org.apache.impala.planner.KuduScanNode.init(org.apache.impala.analysis.Analyzer)
> @bci=32, line=115 (Compiled frame)
> -
> org.apache.impala.planner.SingleNodePlanner.createScanNode(org.apache.impala.analysis.TableRef,
> org.apache.impala.analysis.AggregateInfo,
> org.apache.impala.analysis.Analyzer) @bci=252, line=1312 (Compiled frame)
> ...{noformat}
> The client hangs in Deferred.join():
> [https://github.com/apache/kudu/blob/a8c6ea258c06407c1a4fef260da3a1cb70529bd9/java/kudu-client/src/main/java/org/apache/kudu/client/KuduClient.java#L423]
> To at least mitigate the problem, maybe Deferred.join(long timeout) could be
> used instead.
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