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From "ShiXing (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-6327) HLog can be null when create table
Date Wed, 04 Jul 2012 10:50:33 GMT
ShiXing created HBASE-6327:

             Summary: HLog can be null when create table
                 Key: HBASE-6327
                 URL: https://issues.apache.org/jira/browse/HBASE-6327
             Project: HBase
          Issue Type: Bug
            Reporter: ShiXing
            Assignee: ShiXing
         Attachments: createTableFailedMaster.log

As HBASE-4010 discussed, the HLog can be null.

We have meet createTable failed because the no use hlog.

When createHReagion, the HLog.LogSyncer is run sync(), in under layer it call the DFSClient.DFSOutputStream.sync().

Then the hlog.closeAndDelete() was called,firstly the HLog.close() will interrupt the LogSyncer,
and interrupt DFSClient.DFSOutputStream.sync().The DFSClient.DFSOutputStream will store the
exception and throw it when we called DFSClient.close(). 

The HLog.close() call the writer.close()/DFSClient.close() after interrupt the LogSyncer.
And there is no catch exception for the close().

So the Master throw exception to the client. There is no need to throw this exception, further,
the hlog is no use.

Our cluster is 0.90, the logs is attached, after "closing hlog writer", there is no log for
the createTable().

The trunk and 0.92, 0.94, we used just one hlog, and if the exception happends, the client
will got createTable failed, but indeed ,all the regions for the table can also be assigned.

I will give the patch for this later.

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