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From "Pankaj Kumar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-15109) Region server failed to start when "fs.hdfs.impl.disable.cache" is set to true
Date Thu, 14 Jan 2016 15:32:39 GMT
Pankaj Kumar created HBASE-15109:
------------------------------------

             Summary: Region server failed to start when "fs.hdfs.impl.disable.cache" is set
to true
                 Key: HBASE-15109
                 URL: https://issues.apache.org/jira/browse/HBASE-15109
             Project: HBase
          Issue Type: Bug
          Components: regionserver
    Affects Versions: 1.0.0
            Reporter: Pankaj Kumar
            Assignee: Pankaj Kumar
            Priority: Critical


Region server failed to start during installing ShutdownHook when "fs.hdfs.impl.disable.cache"
is set to true in core-site.xml at HBase side.

{code}
2016-01-14 15:30:56,358 | FATAL | regionserver/ds2/192.168.152.230:21302 | ABORTING region
server ds2,21302,1452756654352: Unhandled: Failed suppression of fs shutdown hook: org.apache.hadoop.fs.FileSystem$Cache$ClientFinalizer@571527d6
| org.apache.hadoop.hbase.regionserver.HRegionServer.abort(HRegionServer.java:2054)
java.lang.RuntimeException: Failed suppression of fs shutdown hook: org.apache.hadoop.fs.FileSystem$Cache$ClientFinalizer@571527d6
at org.apache.hadoop.hbase.regionserver.ShutdownHook.suppressHdfsShutdownHook(ShutdownHook.java:204)
at org.apache.hadoop.hbase.regionserver.ShutdownHook.install(ShutdownHook.java:84)
at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:893)
at java.lang.Thread.run(Thread.java:745)
{code}

During installation, first time it will try to suppress the HDFS shutdownhook by removing
the hdfsclientfinalizer from HDFS. Since fs.hdfs.impl.disable.cache is enabled, so removal
will be unsuccessful from HDFS  (FS is not cached) and RuntimeException will be thrown with
"Failed suppression of fs shutdown hook" message.

In ShutdownHook,
{code}
if (!fsShutdownHooks.containsKey(hdfsClientFinalizer) &&
!ShutdownHookManager.deleteShutdownHook(hdfsClientFinalizer)) {
throw new RuntimeException("Failed suppression of fs shutdown hook: " +
hdfsClientFinalizer);
}
{code}





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