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From Álvaro Recuero <algar...@gmail.com>
Subject Re: Replication warning
Date Tue, 28 May 2013 12:23:16 GMT
Hi Ted,

I see, let me check that out then and try to integrate that patch-code into
my release. For sure it will make a difference just by seeing the lines in
the patch mentioned. Thank you.

Best,
Álvaro


On 28 May 2013 04:26, Ted Yu <yuzhihong@gmail.com> wrote:

> There was a recently integrated JIRA (0.94.8):
> HBASE-7122 Proper warning message when opening a log file with no entries
> (idle cluster)
>
> The stack trace in above JIRA looks very similar to yours.
>
> On Mon, May 27, 2013 at 8:40 AM, Álvaro Recuero <algarecu@gmail.com>
> wrote:
>
> > Hi All,
> >
> > From the shell:
> >
> > ~/hbase-0.94.4$ ./bin/hbase shell
> > HBase Shell; enter 'help<RETURN>' for list of supported commands.
> > Type "exit<RETURN>" to leave the HBase Shell
> > Version 0.94.4, r, Mon May 27 15:29:11 WEST 2013
> >
> > I have seen today it comes up as soon as there is a new item to be
> > replicated, and even happens if an old Hlog is rolled. I am not really
> sure
> > what is going there behind the scenes of Hbase.
> >
> > Regards,
> > Álvaro
> >
> > On 27 May 2013 14:43, Ted Yu <yuzhihong@gmail.com> wrote:
> >
> > > The warning came from this loop in ReplicationSource:
> > >
> > >     // Loop until we close down
> > >     while (isActive()) {
> > > ...
> > >       // Open a reader on it
> > >       if (!openReader(sleepMultiplier)) {
> > >         // Reset the sleep multiplier, else it'd be reused for the next
> > > file
> > >         sleepMultiplier = 1;
> > >         continue;
> > >       }
> > >
> > >       // If we got a null reader but didn't continue, then sleep and
> > > continue
> > >       if (this.reader == null) {
> > >         if (sleepForRetries("Unable to open a reader",
> sleepMultiplier))
> > {
> > >           sleepMultiplier++;
> > >         }
> > >         continue;
> > >       }
> > >
> > > How often did the following warning come up in the server log ?
> > > Which version of HBase are you using ?
> > >
> > > Cheers
> > >
> > > On Mon, May 27, 2013 at 5:15 AM, Álvaro Recuero <algarecu@gmail.com>
> > > wrote:
> > >
> > > > Does anyone get this when replication is enabled in HBase? If it is a
> > > > warning but does not stop coming up, I wonder what that loop is that
> > > > iterating through and if this is really a critical problem.
> > > >
> > > > cheers,
> > > > Álvaro
> > > >
> > > > 2013-05-27 13:10:40,406 WARN
> > > > org.apache.hadoop.hbase.replication.regionserver.ReplicationSource:
> > > Waited
> > > > too long for this file, considering dumping
> > > > 2013-05-27 13:10:40,406 DEBUG
> > > > org.apache.hadoop.hbase.replication.regionserver.ReplicationSource:
> > > Unable
> > > > to open a reader, sleeping 1000 times 10
> > > > 2013-05-27 13:10:50,411 WARN
> > > > org.apache.hadoop.hbase.replication.regionserver.ReplicationSource: 1
> > > Got:
> > > > java.io.EOFException
> > > > at java.io.DataInputStream.readFully(DataInputStream.java:197)
> > > >  at java.io.DataInputStream.readFully(DataInputStream.java:169)
> > > > at
> > org.apache.hadoop.io.SequenceFile$Reader.init(SequenceFile.java:1508)
> > > >  at
> > > org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1486)
> > > > at
> > > org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1475)
> > > >  at
> > > org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1470)
> > > > 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:721)
> > > >  at
> > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.replication.regionserver.ReplicationHLogReaderManager.openReader(ReplicationHLogReaderManager.java:66)
> > > > at
> > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.openReader(ReplicationSource.java:562)
> > > >  at
> > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.run(ReplicationSource.java:339)
> > > >
> > >
> >
>

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