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From "Himanshu Vashishtha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7122) Proper warning message when opening a log file with no entries (idle cluster)
Date Tue, 23 Apr 2013 21:09:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13639634#comment-13639634
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Himanshu Vashishtha commented on HBASE-7122:
--------------------------------------------

Yes, as Chris said, this is not a NN call. Thanks for the reviews guys.
                
> Proper warning message when opening a log file with no entries (idle cluster)
> -----------------------------------------------------------------------------
>
>                 Key: HBASE-7122
>                 URL: https://issues.apache.org/jira/browse/HBASE-7122
>             Project: HBase
>          Issue Type: Bug
>          Components: Replication
>    Affects Versions: 0.94.2
>            Reporter: Himanshu Vashishtha
>            Assignee: Himanshu Vashishtha
>             Fix For: 0.95.1
>
>         Attachments: HBase-7122-94.patch, HBase-7122-95.patch, HBase-7122-95-v2.patch,
HBase-7122-95-v3.patch, HBase-7122-95-v4.patch, HBase-7122.patch, HBASE-7122.v2.patch
>
>
> In case the cluster is idle and the log has rolled (offset to 0), replicationSource tries
to open the log and gets an EOF exception. This gets printed after every 10 sec until an entry
is inserted in it.
> {code}
> 2012-11-07 15:47:40,924 DEBUG regionserver.ReplicationSource (ReplicationSource.java:openReader(487))
- Opening log for replication c0315.hal.cloudera.com%2C40020%2C1352324202860.1352327804874
at 0
> 2012-11-07 15:47:40,926 WARN  regionserver.ReplicationSource (ReplicationSource.java:openReader(543))
- 1 Got: 
> java.io.EOFException
> 	at java.io.DataInputStream.readFully(DataInputStream.java:180)
> 	at java.io.DataInputStream.readFully(DataInputStream.java:152)
> 	at org.apache.hadoop.io.SequenceFile$Reader.init(SequenceFile.java:1508)
> 	at org.apache.hadoop.io.SequenceFile$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:175)
> 	at org.apache.hadoop.hbase.regionserver.wal.HLog.getReader(HLog.java:716)
> 	at org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.openReader(ReplicationSource.java:491)
> 	at org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.run(ReplicationSource.java:290)
> 2012-11-07 15:47:40,927 WARN  regionserver.ReplicationSource (ReplicationSource.java:openReader(547))
- Waited too long for this file, considering dumping
> 2012-11-07 15:47:40,927 DEBUG regionserver.ReplicationSource (ReplicationSource.java:sleepForRetries(562))
- Unable to open a reader, sleeping 1000 times 10
> {code}
> We should reduce the log spewing in this case (or some informative message, based on
the offset).

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