Thanks for your help Ted. >From the master's log, I see
2014-08-09 22:50:51,176 DEBUG [827019302@qtp-63557232-287] client.HBaseAdmin: Trying to compact {ENCODED => 12c9a609765ad0bbd6468d93368f860a, NAME => 'm_data,2fd811c2b1d7476efb16499ccb2b823d,1406512331699.12c9a609765ad0bbd6468d93368f860a.', STARTKEY => '2fd811c2b1d7476efb16499ccb2b823d', ENDKEY => '3328d07989225a29067b7b7981150052'}: org.apache.hadoop.hbase.NotServingRegionException: org.apache.hadoop.hbase.NotServingRegionException: Region m_hashes,2fd811c2b1d7476efb16499ccb2b823d,1406512331699.12c9a609765ad0bbd6468d93368f860a. is not online at org.apache.hadoop.hbase.regionserver.HRegionServer.getRegionByEncodedName(HRegionServer.java:2585) at org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:3952) at org.apache.hadoop.hbase.regionserver.HRegionServer.compactRegion(HRegionServer.java:3750) at org.apache.hadoop.hbase.protobuf.generated.AdminProtos$AdminService$2.callBlockingMethod(AdminProtos.java:19803) at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2175) at org.apache.hadoop.hbase.ipc.RpcServer$Handler.run(RpcServer.java:1879) at sun.reflect.GeneratedConstructorAccessor27.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at org.apache.hadoop.ipc.RemoteException.instantiateException(RemoteException.java:106) at org.apache.hadoop.ipc.RemoteException.unwrapRemoteException(RemoteException.java:95) at org.apache.hadoop.hbase.protobuf.ProtobufUtil.getRemoteException(ProtobufUtil.java:277) at org.apache.hadoop.hbase.client.HBaseAdmin.compact(HBaseAdmin.java:1647) at org.apache.hadoop.hbase.client.HBaseAdmin.compact(HBaseAdmin.java:1623) at org.apache.hadoop.hbase.client.HBaseAdmin.compact(HBaseAdmin.java:1504) at org.apache.hadoop.hbase.client.HBaseAdmin.compact(HBaseAdmin.java:1491) at org.apache.hadoop.hbase.generated.master.table_jsp._jspService(table_jsp.java:111) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98) at javax.servlet.http.HttpServlet.service(HttpServlet.java:848) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1221) at org.apache.hadoop.http.lib.StaticUserWebFilter$StaticUserFilter.doFilter(StaticUserWebFilter.java:109) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212) at org.apache.hadoop.http.HttpServer$QuotingInputFilter.doFilter(HttpServer.java:1081) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212) at org.apache.hadoop.http.NoCacheFilter.doFilter(NoCacheFilter.java:45) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399) at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450) 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:326) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928) at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549) at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410) at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582) ... 2014-08-09 23:11:29,846 INFO [AM.-pool1-t3] master.AssignmentManager: Skip assigning {ENCODED => d5887dd2b5897d14a6d2a041fc2ace1f, NAME => 'm_data,2f03f0fa374de8af4880ba49401cd441,1406839342141.d5887dd2b5897d14a6d2a041fc2ace1f.', STARTKEY => '2f03f0fa374de8af4880ba49401cd441', ENDKEY => '2fd811c2b1d7476efb16499ccb2b823d'}, we couldn't close it: {d5887dd2b5897d14a6d2a041fc2ace1f state=FAILED_CLOSE, ts=1407651089846, server=dn05.manage.com,60020,1407649977124} ... 2014-08-10 07:49:17,589 INFO [RpcServer.handler=237,port=60000] master.AssignmentManager: Skip assigning m_data,2fd811c2b1d7476efb16499ccb2b823d,1406512331699.12c9a609765ad0bbd6468d93368f860a., it's host dn29.manage.com,60020,1407600154728 is dead but not processed yet And I checked dn29 via hbase UI running at http://dn29.manage.com:60030/rs-status, looks like there is no regions on dn29. thanks thomas On Sun, Aug 10, 2014 at 12:28 PM, Ted Yu <yuzhih...@gmail.com> wrote: > Can you check master log to see why 'm_data,2fd811c2b1d7476efb16499ccb2b823d' > went offline ? > > Thanks > > > On Sun, Aug 10, 2014 at 12:13 PM, Thomas Kwan <thomas.k...@manage.com> > wrote: > >> Hi Ted, >> >> Hbase version is 0.96.0.2.0 >> >> Nothing interesting in the hbase log on dn29 and confirmed that region >> server is running on dn29 >> >> When I do 'get', i see >> >> hbase(main):001:0> get 'm_data','2fd811c2b1d7476efb16499ccb2b823d' >> >> COLUMN CELL >> >> ERROR: org.apache.hadoop.hbase.NotServingRegionException: Region >> >> m_data,2fd811c2b1d7476efb16499ccb2b823d,1406512331699.12c9a609765ad0bbd6468d93368f860a. >> is not online >> at >> org.apache.hadoop.hbase.regionserver.HRegionServer.getRegionByEncodedName(HRegionServer.java:2585) >> at >> org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:3952) >> at >> org.apache.hadoop.hbase.regionserver.HRegionServer.get(HRegionServer.java:2733) >> at >> org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:26925) >> at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2175) >> at org.apache.hadoop.hbase.ipc.RpcServer$Handler.run(RpcServer.java:1879) >> >> On Sun, Aug 10, 2014 at 10:32 AM, Ted Yu <yuzhih...@gmail.com> wrote: >> > bq. if I can just rmr stuff under /hbase-unsecure/splitWAL/... >> > >> > Please don't. >> > >> > Have you checked region server log on dn29.manage.com ? >> > >> > What hbase version are you using ? >> > >> > Cheers >> > >> > >> > On Sun, Aug 10, 2014 at 10:27 AM, Thomas Kwan <thomas.k...@manage.com> >> > wrote: >> > >> >> And I have a program that do some read operations and it hangs. And I am >> >> seeing >> >> >> >> 2014-08-10 12:22:05,359 DEBUG [main] >> >> client.HConnectionManager$HConnectionImplementation: Removed all >> >> cached region locations that map to >> >> dn29.manage.com,60020,1407600154728 >> >> 2014-08-10 12:22:06,173 DEBUG [main] >> >> client.HConnectionManager$HConnectionImplementation: Removed >> >> dn29.manage.com:60020 as a location of >> >> >> >> >> m_data,2fd811c2b1d7476efb16499ccb2b823d,1406512331699.12c9a609765ad0bbd6468d93368f860a. >> >> for tableName=m_data from cache >> >> 2014-08-10 12:22:07,180 DEBUG [main] >> >> client.HConnectionManager$HConnectionImplementation: Removed >> >> dn29.manage.com:60020 as a location of >> >> >> >> >> m_data,2fd811c2b1d7476efb16499ccb2b823d,1406512331699.12c9a609765ad0bbd6468d93368f860a. >> >> for tableName=m_data from cache >> >> 2014-08-10 12:22:09,193 DEBUG [main] >> >> client.HConnectionManager$HConnectionImplementation: Removed >> >> dn29.manage.com:60020 as a location of >> >> >> >> >> m_data,2fd811c2b1d7476efb16499ccb2b823d,1406512331699.12c9a609765ad0bbd6468d93368f860a. >> >> for tableName=m_data from cache >> >> 2014-08-10 12:22:09,196 DEBUG [main] >> >> client.HConnectionManager$HConnectionImplementation: Removed all >> >> cached region locations that map to >> >> dn29.manage.com,60020,1407600154728 >> >> 2014-08-10 12:22:13,208 DEBUG [main] >> >> client.HConnectionManager$HConnectionImplementation: Removed all >> >> cached region locations that map to >> >> dn29.manage.com,60020,1407600154728 >> >> >> >> I am seeing the following in the hbase master also >> >> >> >> 2014-08-10 10:22:25,016 INFO >> >> [master02.manage.com,60000,1407690402682.splitLogManagerTimeoutMonitor] >> >> master.SplitLogManager: total tasks = 1 unassigned = 0 >> >> tasks={/hbase-unsecure/splitWAL/WALs%2Fdn29.manage.com >> >> %2C60020%2C1407600154728-splitting%2Fdn29.manage.com >> >> %252C60020%252C1407600154728.1407621759364=last_update >> >> = 1407690428226 last_version = 53 cur_worker_name = >> >> dn21.manage.com,60020,1407650188526 status = in_progress incarnation = >> >> 3 resubmits = 3 batch = installed = 1 done = 0 error = 0} >> >> >> >> I wonder if I can just rmr stuff under /hbase-unsecure/splitWAL/... >> >> >> >> thanks >> >> thomas >> >> >>