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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: Configuration limits for hbase and hadoop ...
Date Tue, 19 Jan 2010 19:41:12 GMT
> 2010-01-19 09:27:48,382 WARN
> org.apache.hadoop.hbase.regionserver.HLog: IPC Server handler 4 on
> 60020 took 1338ms appending an edit to hlog; editcount=222803

This usually means that your HDFS is a tad slow, probably very loaded.

> 2010-01-19 09:28:05,251 INFO org.apache.hadoop.ipc.HBaseServer: IPC
> Server handler 4 on 60020 caught:
> java.nio.channels.ClosedChannelException
>        at sun.nio.ch.SocketChannelImpl.ensureWriteOpen(SocketChannelImpl.java:126)
>        at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:324)
>        at org.apache.hadoop.hbase.ipc.HBaseServer.channelWrite(HBaseServer.java:1125)
>        at org.apache.hadoop.hbase.ipc.HBaseServer$Responder.processResponse(HBaseServer.java:615)
>        at org.apache.hadoop.hbase.ipc.HBaseServer$Responder.doRespond(HBaseServer.java:679)
>        at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:943)

This happens when a client (like a mapreduce task) gets killed while
the operation is happening on the region server.

J-D

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