Thanks.
already tried this.
now i am getting another stack traces
HTTP ERROR: 500
Trying to contact region server 192.168.2.34:60020 for region
.META.,,1, row '', but failed after 3 attempts.
Exceptions:
org.apache.hadoop.hbase.NotServingRegionException:
org.apache.hadoop.hbase.NotServingRegionException: .META.,,1
at
org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:2269)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.openScanner(HRegionServer.java:1848)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:657)
at
org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:915)
org.apache.hadoop.hbase.NotServingRegionException:
org.apache.hadoop.hbase.NotServingRegionException: .META.,,1
at
org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:2269)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.openScanner(HRegionServer.java:1848)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:657)
at
org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:915)
org.apache.hadoop.hbase.NotServingRegionException:
org.apache.hadoop.hbase.NotServingRegionException: .META.,,1
at
org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:2269)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.openScanner(HRegionServer.java:1848)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:657)
at
org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:915)
RequestURI=/master.jsp
Caused by:
org.apache.hadoop.hbase.client.RetriesExhaustedException: Trying to
contact region server 192.168.2.34:60020 for region .META.,,1, row '',
but failed after 3 attempts.
Exceptions:
org.apache.hadoop.hbase.NotServingRegionException:
org.apache.hadoop.hbase.NotServingRegionException: .META.,,1
at
org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:2269)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.openScanner(HRegionServer.java:1848)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:657)
at
org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:915)
org.apache.hadoop.hbase.NotServingRegionException:
org.apache.hadoop.hbase.NotServingRegionException: .META.,,1
at
org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:2269)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.openScanner(HRegionServer.java:1848)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:657)
at
org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:915)
org.apache.hadoop.hbase.NotServingRegionException:
org.apache.hadoop.hbase.NotServingRegionException: .META.,,1
at
org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:2269)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.openScanner(HRegionServer.java:1848)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:657)
at
org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:915)
On Wed, Sep 22, 2010 at 3:08 PM, Matt Corgan <[email protected]> wrote:
> I had this problem yesterday, which I think was caused by the -ROOT- region
> losing it's only row: the one that points to .META.
>
> To fix it i
> * stopped the HMaster
> * changed it's config file to point to /hbase2 instead of /hbase
> * started it so that it would generate a ROOT region in the new directory
> * stopped it
> * changed back to /hbase
> * used 'hadoop dfs cp.... ' to copy ROOT's hdfs directory from /hbase2 to
> /hbase
> * started HMaster back up
>
> apparently it doesn't care what the content of the ROOT region is on
> startup
>
>
> On Wed, Sep 22, 2010 at 5:45 PM, Dmitriy Lyubimov <[email protected]>
> wrote:
>
> > Hi,
> >
> > after restart of hbase cluster, which was running for a while (and
> perhaps
> > under some stress), my hbase UI fails with the message below. the logs
> also
> > have the same message.
> >
> > My other clients are spitting similar messages
> >
> > tried to do compactions, flush on .meta. table, which seem to succeed but
> > otherwise hbase is still defunct.
> >
> > hbase hdfs directory seems to be looking ok .
> >
> > how can i troubleshoot it further?
> >
> > it's 0.20.5.
> >
> > Thanks in advance.
> > -Dmitriy
> >
> >
> > HTTP ERROR: 500
> >
> > Trying to contact region server null for region , row '', but failed
> > after 3 attempts.
> > Exceptions:
> > org.apache.hadoop.hbase.TableNotFoundException: .META.
> > org.apache.hadoop.hbase.TableNotFoundException: .META.
> > org.apache.hadoop.hbase.TableNotFoundException: .META.
> >
> > RequestURI=/master.jsp
> > Caused by:
> >
> > org.apache.hadoop.hbase.client.RetriesExhaustedException: Trying to
> > contact region server null for region , row '', but failed after 3
> > attempts.
> > Exceptions:
> > org.apache.hadoop.hbase.TableNotFoundException: .META.
> > org.apache.hadoop.hbase.TableNotFoundException: .META.
> > org.apache.hadoop.hbase.TableNotFoundException: .META.
> >
> > at
> >
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.getRegionServerWithRetries(HConnectionManager.java:1037)
> > at
> > org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:75)
> > at
> > org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:48)
> > at
> >
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.listTables(HConnectionManager.java:454)
> > at
> > org.apache.hadoop.hbase.client.HBaseAdmin.listTables(HBaseAdmin.java:127)
> > at
> >
> org.apache.hadoop.hbase.generated.master.master_jsp._jspService(master_jsp.java:152)
> > at
> > org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
> > 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.security.SecurityHandler.handle(SecurityHandler.java:216)
> > at
> > org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
> > at
> > org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
> > at
> > org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
> > at
> >
> org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
> > 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$RequestHandler.headerComplete(HttpConnection.java:864)
> > at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:533)
> > at
> org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:207)
> > at
> org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:403)
> > at
> >
> org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
> > at
> >
> org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:522)
> >
> >
> >
> > on the clients :
> >
> > org.apache.hadoop.hbase.TableNotFoundException: .META.
> > at
> >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:698)
> > at
> >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:630)
> > at
> >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:601)
> > at
> >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:670)
> > at
> >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:634)
> > at
> >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:601)
> > at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:134)
> > at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:112)
> > ...
> >
>
