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https://issues.apache.org/jira/browse/HBASE-5963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13270975#comment-13270975
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Andrew Purtell edited comment on HBASE-5963 at 5/9/12 12:27 AM:
----------------------------------------------------------------
Latest patch seems to do the right thing according to unit tests without
breaking older functionality.
However, what we are doing here is yanking the HDFS client finalizer Runnable
away from the Hadoop 2.x ShutdownHookManager and adding it -- wrapped with our
existing strategy here -- to the Runtime shutdown hook list, to perhaps run
concurrently with the rest of the ShutdownHookManager registered Runnables. I
don't think this more problematic than the rest of this horrible code. The
solution is, someday, to leave Hadoop 1.x behind and transition to using the
2.x ShutdownHookManager.
was (Author: apurtell):
Latest patch seems to do the right thing according to unit tests without
breaking older functionality.
However, what we are doing here is yanking the HDFS client finalizer Runnable
away from the Hadoop 2.x ShutdownHookManager and adding it -- wrapped with our
existing strategy here -- to the Runtime shutdown hook list, to perhaps run
concurrently with the rest of the ShutdownHookManager registered Runnables. I
don't think this less problematic than the rest of this horrible code. The
solution is, someday, to leave Hadoop 1.x behind and transition to using the
2.x ShutdownHookManager.
> ClassCastException: FileSystem$Cache$ClientFinalizer cannot be cast to Thread
> -----------------------------------------------------------------------------
>
> Key: HBASE-5963
> URL: https://issues.apache.org/jira/browse/HBASE-5963
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.94.0, 0.96.0
> Environment: Bigtop 0.4.0-incubating-SNAPSHOT, Hadoop
> 2.0.0-alpha-SNAPSHOT, HBase 0.94.0-SNAPSHOT
> Reporter: Andrew Purtell
> Assignee: Andrew Purtell
> Attachments: HBASE-5963.patch, HBASE-5963.patch
>
>
> {code}
> 12/05/08 19:49:26 INFO regionserver.HRegionServer: STOPPED: Failed
> initialization
> Exception in thread "main" java.lang.ClassCastException:
> org.apache.hadoop.fs.FileSystem$Cache$ClientFinalizer cannot be cast to
> java.lang.Thread
> at
> org.apache.hadoop.hbase.regionserver.ShutdownHook.suppressHdfsShutdownHook(ShutdownHook.java:181)
> at
> org.apache.hadoop.hbase.regionserver.ShutdownHook.install(ShutdownHook.java:82)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.startRegionServer(HRegionServer.java:3601)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.startRegionServer(HRegionServer.java:3585)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServerCommandLine.start(HRegionServerCommandLine.java:61)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServerCommandLine.run(HRegionServerCommandLine.java:75)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
> at
> org.apache.hadoop.hbase.util.ServerCommandLine.doMain(ServerCommandLine.java:76)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.main(HRegionServer.java:3645)
> {code}
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