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From "Chris Almond (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-476) java.lang.ClassCastException: com.mapr.fs.MapRFileSystem cannot be cast to org.apache.hadoop.hdfs.DistributedFileSystem
Date Wed, 08 Aug 2012 15:38:21 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13431172#comment-13431172
] 

Chris Almond commented on ACCUMULO-476:
---------------------------------------

Verified same error is occurring in v1.4.1, with MapR M5 v2.0beta.

{quote}
     java.lang.ClassCastException: com.mapr.fs.MapRFileSystem cannot be cast to org.apache.hadoop.hdfs.DistributedFileSystem
	at org.apache.accumulo.server.monitor.servlets.DefaultServlet.doHdfsTable(DefaultServlet.java:297)
	at org.apache.accumulo.server.monitor.servlets.DefaultServlet.pageBody(DefaultServlet.java:207)
	at org.apache.accumulo.server.monitor.servlets.BasicServlet.doGet(BasicServlet.java:62)
	at org.apache.accumulo.server.monitor.servlets.DefaultServlet.doGet(DefaultServlet.java:146)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:363)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
	at org.mortbay.jetty.Server.handle(Server.java:324)
	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:534)
	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:864)
	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:533)
	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:207)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:403)
	at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:522)
{quote}
                
> java.lang.ClassCastException: com.mapr.fs.MapRFileSystem cannot be cast to org.apache.hadoop.hdfs.DistributedFileSystem
> -----------------------------------------------------------------------------------------------------------------------
>
>                 Key: ACCUMULO-476
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-476
>             Project: Accumulo
>          Issue Type: Bug
>          Components: logger, master, tserver
>         Environment: Accumulo 1.4 rc 2 on mapr m5.
>            Reporter: Todd Stavish
>            Assignee: Eric Newton
>            Priority: Minor
>             Fix For: 1.4.0
>
>
> From Keith Turner on the accumulo user group:
> I looked at the code and its just simply cast to a
> DistributedFileSystem inorder to check if HDFS is in safe mode.  It
> should do an instanceof operation and then do the case.  Would you
> mind opening a ticket about this?

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