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From lars hofhansl <la...@apache.org>
Subject Re: Replication hosed after simple cluster restart
Date Thu, 14 Mar 2013 01:45:03 GMT
Hey no problem. It's cool that we found it in a test env. It's probably quite hard to reproduce.
This is in 0.94.5 but this feature is off by default.

What's the general thought here, should I kill the current 0.94.6 rc for this?
My gut says: Yes.

I'm also a bit worried about these:
2013-03-14 01:42:42,271 DEBUG org.apache.hadoop.hbase.replication.regionserver.ReplicationSource:
Opening log for replication shared-dnds1-12-sfm.ops.sfdc.net%2C60020%2C1363220608780.1363220609572
at 0
2013-03-14 01:42:42,358 WARN org.apache.hadoop.hbase.replication.regionserver.ReplicationSource:
1 Got: 
        at java.io.DataInputStream.readFully(DataInputStream.java:180)
        at java.io.DataInputStream.readFully(DataInputStream.java:152)
        at org.apache.hadoop.io.SequenceFile$Reader.init(SequenceFile.java:1800)
        at org.apache.hadoop.io.SequenceFile$Reader.initialize(SequenceFile.java:1765)
        at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1714)
        at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1728)
        at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader$WALReader.<init>(SequenceFileLogReader.java:55)
        at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader.init(SequenceFileLogReader.java:177)
        at org.apache.hadoop.hbase.regionserver.wal.HLog.getReader(HLog.java:728)
        at org.apache.hadoop.hbase.replication.regionserver.ReplicationHLogReaderManager.openReader(ReplicationHLogReaderManager.java:67)
        at org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.openReader(ReplicationSource.java:507)
        at org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.run(ReplicationSource.java:313)
2013-03-14 01:42:42,358 WARN org.apache.hadoop.hbase.replication.regionserver.ReplicationSource:
Waited too long for this file, considering dumping
2013-03-14 01:42:42,358 DEBUG org.apache.hadoop.hbase.replication.regionserver.ReplicationSource:
Unable to open a reader, sleeping 1000 times 10

This happens after bouncing the cluster a 2nd time and these messages repeat every 10s (for
hours now). This is a separate problem I think.

-- Lars

 From: Himanshu Vashishtha <hvashish@cs.ualberta.ca>
To: dev@hbase.apache.org; lars hofhansl <larsh@apache.org> 
Cc: Ted Yu <yuzhihong@gmail.com> 
Sent: Wednesday, March 13, 2013 6:38 PM
Subject: Re: Replication hosed after simple cluster restart
This is bad. Yes, copyQueuesFromRSUsingMulti returns a list which it
might not be able to move later on, resulting in bogus znodes.
I'll fix this asap. Weird it didn't happen in my testing earlier.
Sorry about this.

On Wed, Mar 13, 2013 at 6:27 PM, lars hofhansl <larsh@apache.org> wrote:
> Sorry 0.94.6RC1
> (I complain about folks not reporting the version all the time, and then I do it too)
> ________________________________
>  From: Ted Yu <yuzhihong@gmail.com>
> To: dev@hbase.apache.org; lars hofhansl <larsh@apache.org>
> Sent: Wednesday, March 13, 2013 6:17 PM
> Subject: Re: Replication hosed after simple cluster restart
> Did this happen on 0.94.5 ?
> Thanks
> On Wed, Mar 13, 2013 at 6:12 PM, lars hofhansl <larsh@apache.org> wrote:
> We just ran into an interesting scenario. We restarted a cluster that was setup as a
replication source.
>>The stop went cleanly.
>>Upon restart *all* regionservers aborted within a few seconds with variations of these
>>This is scary!
>>-- Lars
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