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From Joe Pallas <pal...@cs.stanford.edu>
Subject Warning messages with HBaseTestingUtility.shutdownMiniCluster()
Date Sat, 19 Mar 2011 00:46:32 GMT
We're using HBaseTestingUtility's mini-cluster for testing some client code.  It works great,
except that we sometimes get ugly error messages after our tests finish.

I guessed this was because we weren't shutting down the mini-cluster, so I added that in.
 But calling shutdownMiniCluster() still results in some warnings and stack traces (although
two of them seem to be from shutdown of the HDFS cluster).

Is this normal/expected?  Am I likely to waste more time than it is worth trying to fix it?
 This is on 0.90.0.



17:31:51,213  WARN regionserver.handler.CloseRegionHandler:104 - Received CLOSE for region
Folder,,1300494707186.7b024fb711a7a7e962e4949ee17a05d3. but currently not serving
17:31:51,288  WARN hbase.regionserver.HRegion:494 - Region UserTable,,1300494705653.40e766ad609e0f46871d7a6b488fd669.
already closed
17:31:51,290  WARN regionserver.handler.CloseRegionHandler:122 - Can't close region: was already
closed during close(): UserTable,,1300494705653.40e766ad609e0f46871d7a6b488fd669.
Shutting down the Mini HDFS Cluster
Shutting down DataNode 0
17:31:52,872  WARN server.datanode.DataNode:137 - DatanodeRegistration(, storageID=DS-541927814-,
infoPort=59037, ipcPort=59038):DataXceiveServer: java.nio.channels.AsynchronousCloseException
        at java.nio.channels.spi.AbstractInterruptibleChannel.end(AbstractInterruptibleChannel.java:185)
        at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:159)
        at sun.nio.ch.ServerSocketAdaptor.accept(ServerSocketAdaptor.java:84)
        at org.apache.hadoop.hdfs.server.datanode.DataXceiverServer.run(DataXceiverServer.java:130)
        at java.lang.Thread.run(Thread.java:680)

17:31:53,993  WARN server.namenode.FSNamesystem:2453 - ReplicationMonitor thread received
InterruptedException.java.lang.InterruptedException: sleep interrupted

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