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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3258) EOF when version file is empty
Date Mon, 22 Nov 2010 18:47:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12934547#action_12934547
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Jean-Daniel Cryans commented on HBASE-3258:
-------------------------------------------

For the record, the reason is that I was testing 0.90 with 0.20-append and since both are
currently incompatible at the data transfer level (ugly ugly), the master is able to create
the file but unable to write to. This HDFS-724 situation is bad.

> EOF when version file is empty
> ------------------------------
>
>                 Key: HBASE-3258
>                 URL: https://issues.apache.org/jira/browse/HBASE-3258
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jean-Daniel Cryans
>            Priority: Blocker
>             Fix For: 0.90.0, 0.92.0
>
>
> I somehow was able to get an empty hbase.version file on a test machine and when I start
HBase I see:
> {noformat}
> starting master, logging to /data/jdcryans/git/hbase/bin/../logs/hbase-jdcryans-master-hbasedev.out
> Exception in thread "master-hbasedev:60000" java.lang.NullPointerException
> 	at org.apache.hadoop.hbase.master.HMaster.stopServiceThreads(HMaster.java:559)
> 	at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:286)
> {noformat}
> And in the master's log:
> {noformat}
> 2010-11-22 10:08:43,003 FATAL org.apache.hadoop.hbase.master.HMaster: Unhandled exception.
Starting shutdown.
> java.io.EOFException
>         at java.io.DataInputStream.readUnsignedShort(DataInputStream.java:323)
>         at java.io.DataInputStream.readUTF(DataInputStream.java:572)
>         at org.apache.hadoop.hbase.util.FSUtils.getVersion(FSUtils.java:151)
>         at org.apache.hadoop.hbase.util.FSUtils.checkVersion(FSUtils.java:170)
>         at org.apache.hadoop.hbase.master.MasterFileSystem.checkRootDir(MasterFileSystem.java:226)
>         at org.apache.hadoop.hbase.master.MasterFileSystem.createInitialFileSystemLayout(MasterFileSystem.java:104)
>         at org.apache.hadoop.hbase.master.MasterFileSystem.<init>(MasterFileSystem.java:89)
>         at org.apache.hadoop.hbase.master.HMaster.finishInitialization(HMaster.java:337)
>         at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:273)
> 2010-11-22 10:08:43,006 INFO org.apache.hadoop.hbase.master.HMaster: Aborting
> {noformat}
> I thought that that kind of issue was solved a long time ago, but somehow it's there
again. I'll fix by handling the EOF and also will look at that ugly NPE.

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