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From "Ramana Inukonda Nagaraj (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-1929) After canceling query in sqlline subsequent query in same session hangs
Date Wed, 01 Apr 2015 22:12:54 GMT

    [ https://issues.apache.org/jira/browse/DRILL-1929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14391585#comment-14391585
] 

Ramana Inukonda Nagaraj commented on DRILL-1929:
------------------------------------------------

Still hitting this as of 
git.commit.id.abbrev=96d51bd
(0.9)

Looks to be on the client side though. A new sqlline connection executes queries just fine.


> After canceling query in sqlline subsequent query in same session hangs
> -----------------------------------------------------------------------
>
>                 Key: DRILL-1929
>                 URL: https://issues.apache.org/jira/browse/DRILL-1929
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - RPC
>    Affects Versions: 0.7.0
>            Reporter: Aman Sinha
>            Assignee: Jacques Nadeau
>             Fix For: 0.9.0
>
>
> This might be related to existing query cancel issues but I did not find an exact match.
 Run the following query (against Tpc-ds schema) in sqlline and cntr-c to cancel it after
couple of seconds: 
> {code}
> select ss_sold_date_sk, ss_item_sk, ss_cdemo_sk, ss_hdemo_sk, ss_store_sk, ss_list_price
from store_sales;
> {code}
> The query gets cancelled successfully.  However,  when I submit the same query again
in the same session the query hangs.  Here's a relevant portion of the jstack trace: 
> {code}
> "2b55158d-6837-71ad-d523-bee5055ccc78:frag:0:0" daemon prio=5 tid=0x00007f8d2c4d0000
nid=0x572b waiting on condition [0x0000000122997000]
>    java.lang.Thread.State: WAITING (parking)
>         at sun.misc.Unsafe.park(Native Method)
>         - parking to wait for  <0x0000000703481ba8> (a org.apache.drill.exec.rpc.ResettableBarrier$InternalSynchronizer)
>         at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
>         at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
>         at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:994)
>         at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1303)
>         at org.apache.drill.exec.rpc.ResettableBarrier.await(ResettableBarrier.java:70)
>         at org.apache.drill.exec.rpc.RemoteConnection$WriteManager.waitForWritable(RemoteConnection.java:80)
>         at org.apache.drill.exec.rpc.RemoteConnection.blockOnNotWritable(RemoteConnection.java:53)
>         at org.apache.drill.exec.rpc.RpcBus.send(RpcBus.java:91)
>         at org.apache.drill.exec.rpc.user.UserServer$UserClientConnection.sendResult(UserServer.java:123)
>         at org.apache.drill.exec.physical.impl.ScreenCreator$ScreenRoot.innerNext(ScreenCreator.java:157)
>         at org.apache.drill.exec.physical.impl.BaseRootExec.next(BaseRootExec.java:57)
>         at org.apache.drill.exec.work.fragment.FragmentExecutor.run(FragmentExecutor.java:114)
>         at org.apache.drill.exec.work.WorkManager$RunnableWrapper.run(WorkManager.java:254)
> {code}
> So, it looks like the WriteManager is blocked on a non-writable Rpc channel, which indicates
the query cancellation before did not release all resources. 



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