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From Dmitriy Lyubimov <dlie...@gmail.com>
Subject Re: .META. not found
Date Wed, 22 Sep 2010 22:12:10 GMT
Ok, thanks, it fixed itself. Patience is the key i guess : )

thanks a bunch.

but i see that a lot of people running into this problem with -ROOT- now and
then. i wonder why that is.




On Wed, Sep 22, 2010 at 3:10 PM, Dmitriy Lyubimov <dlieu.7@gmail.com> wrote:

> 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 <mcorgan@hotpads.com> 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 <dlieu.7@gmail.com>
>> 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)
>> > ...
>> >
>>
>
>

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