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From "Himanshu Vashishtha (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-7122) Proper warning message when opening a log file with no entries (idle cluster)
Date Thu, 08 Nov 2012 00:22:11 GMT
Himanshu Vashishtha created HBASE-7122:

             Summary: Proper warning message when opening a log file with no entries (idle
                 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: 0.96.0

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 the
an entry is inserted in it.
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: 
	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

We should reduce the log spewing in this case (or some informative message, based on the offset).

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