Re: Region server getting aborted in every one or two days

[Anoop John]

At the same time, any explicit close op happened on the WAL file?  Any
log rolling?  Can u check the logs to know this?  May be check HDFS
logs to know abt the close calls to WAL file?

-Anoop-

On Wed, Mar 23, 2016 at 12:10 PM, Pankaj kr <pankaj...@huawei.com> wrote:
> Hi,
>
> In our production environment, RS is getting aborted in every one or two days 
> with following exception.
>
> 2016-03-16 13:57:07,975 | FATAL | MemStoreFlusher.0 | ABORTING region server 
> xyz-vm8,24502,1458034278600: Replay of WAL required. Forcing server shutdown 
> | 
> org.apache.hadoop.hbase.regionserver.HRegionServer.abort(HRegionServer.java:2055)
> org.apache.hadoop.hbase.DroppedSnapshotException: region: 
> TB_WEBLOGIN_201603,060,1457916997964.06e204d3bc262b72820aa195fec23513.
>                 at 
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushCacheAndCommit(HRegion.java:2423)
>                 at 
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2128)
>                 at 
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2090)
>                 at 
> org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:1983)
>                 at 
> org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:1909)
>                 at 
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:509)
>                 at 
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:470)
>                 at 
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.access$800(MemStoreFlusher.java:74)
>                 at 
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher$FlushHandler.run(MemStoreFlusher.java:259)
>                 at java.lang.Thread.run(Thread.java:745)
> Caused by: java.nio.channels.ClosedChannelException
>               at 
> org.apache.hadoop.hdfs.DataStreamer$LastExceptionInStreamer.throwException4Close(DataStreamer.java:208)
>                 at 
> org.apache.hadoop.hdfs.DFSOutputStream.checkClosed(DFSOutputStream.java:142)
>                 at 
> org.apache.hadoop.hdfs.DFSOutputStream.flushOrSync(DFSOutputStream.java:635)
>                 at 
> org.apache.hadoop.hdfs.DFSOutputStream.hflush(DFSOutputStream.java:490)
>                 at 
> org.apache.hadoop.fs.FSDataOutputStream.hflush(FSDataOutputStream.java:130)
>                 at 
> org.apache.hadoop.hbase.regionserver.wal.ProtobufLogWriter.sync(ProtobufLogWriter.java:190)
>                 at 
> org.apache.hadoop.hbase.regionserver.wal.FSHLog$SyncRunner.run(FSHLog.java:1342)
>                 ... 1 more
>
> I don't see any error info at HDFS side at that point of time.
> Have anyone faced this issue?
>
> HBase version is 0.98.6.
>
> Regards,
> Pankaj