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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15109) Region server failed to start when "fs.hdfs.impl.disable.cache" is set to true
Date Wed, 06 Apr 2016 22:04:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15229227#comment-15229227
] 

Ted Yu commented on HBASE-15109:
--------------------------------

{code}
202	        boolean disabledFsCache = fs.getConf().getBoolean("fs.hdfs.impl.disable.cache",
false);
{code}
I searched in hadoop repo - the default value for this config is "true"

> 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
>         Attachments: HBASE-15109-branch-1.patch, HBASE-15109.patch, HBASE-15109.patch
>
>
> 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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