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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17323) TestAsyncGetMultiThread fails in master
Date Sat, 17 Dec 2016 00:47:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15755944#comment-15755944
] 

Duo Zhang commented on HBASE-17323:
-----------------------------------

I think the queue full is in the setUp method where I put 1000 rows concurrently. This is
what [~carp84] said, with async client we need to pay more attention on the pressure of RS.
One simple solution is to use a separated sleep mechanism when call queue is full, and a more
beautiful solution is to track the pressure of RS and give a reasonable sleep time when retrying.
We have done some works before, see the classes under o.a.h.h.client.backoff package, but
I haven't found a proper way to use them. But I do not think this is the reason why this test
fails. It just wastes some time...

And the error posted by Ted is intenional. In this test I keep moving regions(include meta
region) across RSes to test if there are data races which will lead to incorrect result. Let
me dig more.

Thanks.

> TestAsyncGetMultiThread fails in master
> ---------------------------------------
>
>                 Key: HBASE-17323
>                 URL: https://issues.apache.org/jira/browse/HBASE-17323
>             Project: HBase
>          Issue Type: Test
>            Reporter: Ted Yu
>         Attachments: 17323.hack.txt, testAsyncGetMultiThread-output.gz
>
>
> From https://builds.apache.org/job/HBase-Trunk_matrix/2137/jdk=JDK%201.8%20(latest),label=Hadoop/testReport/junit/org.apache.hadoop.hbase.client/TestAsyncGetMultiThread/test/
:
> {code}
> java.util.concurrent.ExecutionException: java.lang.NullPointerException
> 	at org.apache.hadoop.hbase.util.Bytes.toInt(Bytes.java:1003)
> 	at org.apache.hadoop.hbase.util.Bytes.toInt(Bytes.java:980)
> 	at org.apache.hadoop.hbase.client.TestAsyncGetMultiThread.run(TestAsyncGetMultiThread.java:108)
> 	at org.apache.hadoop.hbase.client.TestAsyncGetMultiThread.lambda$null$1(TestAsyncGetMultiThread.java:122)
> {code}
> This can be reproduced locally.



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