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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17287) Master becomes a zombie if filesystem object closes
Date Mon, 27 Mar 2017 19:33:41 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15943910#comment-15943910
] 

Ted Yu commented on HBASE-17287:
--------------------------------

How do we assert that master comes down due to the added check ?

Difference in handling meta server shutdown between master branch and branch-1 may also pose
some challenge in writing test.

How about adding test in another issue ?

> Master becomes a zombie if filesystem object closes
> ---------------------------------------------------
>
>                 Key: HBASE-17287
>                 URL: https://issues.apache.org/jira/browse/HBASE-17287
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>            Reporter: Clay B.
>            Assignee: Ted Yu
>             Fix For: 1.4.0, 2.0
>
>         Attachments: 17287.branch-1.v3.txt, 17287.master.v2.txt, 17287.master.v3.txt,
17287.v2.txt
>
>
> We have seen an issue whereby if the HDFS is unstable and the HBase master's HDFS client
is unable to stabilize before {{dfs.client.failover.max.attempts}} then the master's filesystem
object closes. This seems to result in an HBase master which will continue to run (process
and znode exists) but no meaningful work can be done (e.g. assigning meta).What we saw in
our HBase master logs was:{code}2016-12-01 19:19:08,192 ERROR org.apache.hadoop.hbase.master.handler.MetaServerShutdownHandler:
Caught M_META_SERVER_SHUTDOWN, count=1java.io.IOException: failed log splitting for cluster-r5n12.bloomberg.com,60200,1480632863218,
will retryat org.apache.hadoop.hbase.master.handler.MetaServerShutdownHandler.process(MetaServerShutdownHandler.java:84)at
org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:129)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)at java.lang.Thread.run(Thread.java:745)Caused
by: java.io.IOException: Filesystem closed{code}



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