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https://issues.apache.org/jira/browse/HBASE-18804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16164417#comment-16164417
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Guangxu Cheng commented on HBASE-18804:
---------------------------------------
Upload the first patch for review.
> Sanity check the number of regions when creating a table
> --------------------------------------------------------
>
> Key: HBASE-18804
> URL: https://issues.apache.org/jira/browse/HBASE-18804
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 2.0.0, 1.5.0
> Reporter: Guangxu Cheng
> Assignee: Guangxu Cheng
> Attachments: HBASE-18804.master.v1.patch
>
>
> A few days ago, a table was erroneously created with NUMREGIONS set to 200k
> which resulted in the master down.
> I got exceptions like:
> {code:java}
> 2017-08-17 11:10:17,970 WARN [main-SendThread(localhost:2181)]
> zookeeper.ClientCnxn: Session 0x45c9d4132c547f1 for server
> localhost/localhost:2181, unexpected error, closing socket connection and
> attempting reconnect
> java.io.IOException: Packet len6842180 is out of range!
> at
> org.apache.zookeeper.ClientCnxnSocket.readLength(ClientCnxnSocket.java:112)
> at
> org.apache.zookeeper.ClientCnxnSocketNIO.doIO(ClientCnxnSocketNIO.java:79)
> at
> org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:366)
> at
> org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
> {code}
> That's because a lot of regions need to assign in a short interval, and the
> size of the node /hbase/region-in-transition exceeds the default value.
> We solved this problem by setting "jute.maxbuffer".
> But we can sanity check the number of regions when creating a table and
> reject the requests.
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