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https://issues.apache.org/jira/browse/ACCUMULO-873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13503969#comment-13503969
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Eric Newton commented on ACCUMULO-873:
--------------------------------------
My preference is to remove this from the monitor page.
# it doesn't work with a non-hdfs user
# it isn't part of the public API
# hdfs works well enough these days that we're not monitoring it so closely,
which was the purpose for it in the first place
# it won't work with other file systems
# JobTracker box should go away, too: there's no API for it in foture versions
of hadoop
> Monitor broken on top of MapR
> -----------------------------
>
> Key: ACCUMULO-873
> URL: https://issues.apache.org/jira/browse/ACCUMULO-873
> Project: Accumulo
> Issue Type: Bug
> Components: monitor
> Affects Versions: 1.4.1, 1.4.2
> Environment: MapR
> Reporter: John Vines
> Assignee: Eric Newton
>
> Accumulo includes some HDFS information on the Overview page of the monitor.
> Unfortunately, on MapR, there is a casting issue which causes everything on
> the page to break. Ideally, I would like to see this work, either from MapR
> being part of the same Interface or us supporting MapR in this space. At the
> very least, I would like to see the monitor unkinked so that if there IS an
> error, we at least get the useful graphs.
> {code}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){code}
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