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From "Jean-Marc Spaggiari (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11192) HBase ClusterId File Empty Check Loggic
Date Sat, 17 May 2014 01:27:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14000591#comment-14000591
] 

Jean-Marc Spaggiari commented on HBASE-11192:
---------------------------------------------

FSUtils.getClusterId() will return null because your file is empty and will store null in
clusterId too. And this value is used later for many other operations. You should have an
entry on your logs saying that ID can not be retrieved. This is normal for HBase to not start
in those conditions. I don't think this is a big. Can you please confirm the master is down
after that? It should.

> HBase ClusterId File Empty Check Loggic
> ---------------------------------------
>
>                 Key: HBASE-11192
>                 URL: https://issues.apache.org/jira/browse/HBASE-11192
>             Project: HBase
>          Issue Type: Bug
>         Environment: HBase 0.94+Hadoop2.2.0+Zookeeper3.4.5
>            Reporter: sunjingtao
>
> if the clusterid file exists but empty ,then the following check logic in the MasterFileSystem.java
has none effects.
>     if (!FSUtils.checkClusterIdExists(fs, rd, c.getInt(
>         HConstants.THREAD_WAKE_FREQUENCY, 10 * 1000))) {
>           FSUtils.setClusterId(fs, rd, UUID.randomUUID().toString(), c.getInt(
>           HConstants.THREAD_WAKE_FREQUENCY, 10 * 1000));
>     }
>     clusterId = FSUtils.getClusterId(fs, rd);
> because the checkClusterIdExists method only check the path .
>         Path filePath = new Path(rootdir, HConstants.CLUSTER_ID_FILE_NAME);
>         return fs.exists(filePath);
> in my case ,the file exists but is empty,so the readed clusterid is null which cause
a nullPointerException:
> java.lang.NullPointerException
> 	at org.apache.hadoop.hbase.util.Bytes.toBytes(Bytes.java:441)
> 	at org.apache.hadoop.hbase.zookeeper.ClusterId.setClusterId(ClusterId.java:72)
> 	at org.apache.hadoop.hbase.master.HMaster.finishInitialization(HMaster.java:581)
> 	at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:433)
> 	at java.lang.Thread.run(Thread.java:745)
> is this a bug?please make sure!



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