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From "Jean-Daniel Cryans" <jdcry...@apache.org>
Subject Re: HBase 0.19.0 RC:Could not obtain block error
Date Sun, 18 Jan 2009 20:33:44 GMT
Genady,

That type of error means that HDFS is having some difficulties serving
HBase. Things you should do:

- Look in your datanodes logs for any signs of
http://wiki.apache.org/hadoop/Hbase/FAQ#6 and btw, what you referred to
Hadoop logs is in fact HBase logs.

- Tell us about your hardware.

- Try to know how many regions were in your table when it began to go wrong.
Also check if your nodes are swapping (or any other sign of overloading).

Thx,

J-D

On Sun, Jan 18, 2009 at 3:15 PM, Genady Gillin <genadyg@exelate.com> wrote:

> Hi,
>
>
> I'm trying to use Hadoop 0.19/HBase 0.19.0 RC with four nodes, after
> inserting about 200G of data MR task is start to fail with *
> NoServerForRegionException*, region server log is full of "Could not obtain
> block */hbase/.META./1028785192/info/mapfiles/722281705778744225/data*"
> exceptions, restart of Hadoop/Hbase doesn't help, is there any workaround
> solve this?
> BTW: data is there and could be seen with dfs -cat.
>
> Hadoop settings:
> dfs.replication=2,
> *// as recommended in troubles section of hbase site*
> dfs.datanode.handler.count=5
> dfs.datanode.socket.write.timeout=0
>
> Any help would be appreciated,
> Gennady
>
> HBase logs:
>
> *org.apache.hadoop.hbase.client.NoServerForRegionException: Timed out
> trying
> to locate root region
>        at
>
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRootRegion(HConnectionManager.java:768)
>        at
>
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:448)
>        at
>
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.relocateRegion(HConnectionManager.java:430)
>        at
>
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:557)
>        at
>
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:457)
>        at
>
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.relocateRegion(HConnectionManager.java:430)
>        at
>
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:557)
>        at
>
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:461)
>        at
>
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:423)
>        at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:114)
>        at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:97)
>        at
>
> org.apache.hadoop.hbase.mapred.TableOutputFormat.getRecordWriter(TableOutputFormat.java:90)
>        at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:399)
>        at org.apache.hadoop.mapred.Child.main(Child.java:155)*
>
>
> Hadoop logs:
>
>
> *java.io.IOException: java.io.IOException: HStoreScanner failed
> construction
>        at
>
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.<init>(StoreFileScanner.java:70)
>        at
>
> org.apache.hadoop.hbase.regionserver.HStoreScanner.<init>(HStoreScanner.java:88)
>        at
> org.apache.hadoop.hbase.regionserver.HStore.getScanner(HStore.java:2125)
>        at
>
> org.apache.hadoop.hbase.regionserver.HRegion$HScanner.<init>(HRegion.java:1989)
>        at
> org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1180)
>        at
>
> org.apache.hadoop.hbase.regionserver.HRegionServer.openScanner(HRegionServer.java:1700)
>        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$Server.call(HBaseRPC.java:632)
>        at
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:894)
> Caused by: java.io.IOException: Could not obtain block:
> blk_-5027942609246712759_11342
> file=/hbase/.META./1028785192/info/mapfiles/722281705778744225/index
>        at
>
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.chooseDataNode(DFSClient.java:1708)
>        at
>
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:1536)
>        at
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.read(DFSClient.java:1663)
>        at java.io.DataInputStream.readFully(DataInputStream.java:178)
>        at java.io.DataInputStream.readFully(DataInputStream.java:152)
>        at
> org.apache.hadoop.hbase.io.SequenceFile$Reader.init(SequenceFile.java:1464)
>        at
>
> org.apache.hadoop.hbase.io.SequenceFile$Reader.<init>(SequenceFile.java:1442)
>        at
>
> org.apache.hadoop.hbase.io.SequenceFile$Reader.<init>(SequenceFile.java:1431)
>        at
>
> org.apache.hadoop.hbase.io.SequenceFile$Reader.<init>(SequenceFile.java:1426)
>        at org.apache.hadoop.hbase.io.MapFile$Reader.open(MapFile.java:301)
>        at
>
> org.apache.hadoop.hbase.io.HBaseMapFile$HBaseReader.<init>(HBaseMapFile.java:79)
>        at
>
> org.apache.hadoop.hbase.io.BloomFilterMapFile$Reader.<init>(BloomFilterMapFile.java:65)
>        at
>
> org.apache.hadoop.hbase.regionserver.HStoreFile.getReader(HStoreFile.java:443)
>        at
>
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.openReaders(StoreFileScanner.java:96)
>        at
>
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.<init>(StoreFileScanner.java:67)
>        ... 11 more
>
>        at sun.reflect.GeneratedConstructorAccessor12.newInstance(Unknown
> Source)
>        at
>
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
>        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
>        at
>
> org.apache.hadoop.hbase.RemoteExceptionHandler.decodeRemoteException(RemoteExceptionHandler.java:95)
>        at
> org.apache.hadoop.hbase.master.BaseScanner.scanRegion(BaseScanner.java:185)
>        at
>
> org.apache.hadoop.hbase.master.MetaScanner.scanOneMetaRegion(MetaScanner.java:73)
>        at
>
> org.apache.hadoop.hbase.master.MetaScanner.maintenanceScan(MetaScanner.java:129)
>        at
> org.apache.hadoop.hbase.master.BaseScanner.chore(BaseScanner.java:137)
>        at org.apache.hadoop.hbase.Chore.run(Chore.java:65)
> 2009-01-18 14:19:06,038 INFO org.apache.hadoop.hbase.master.BaseScanner:
> All
> 1 .META. region(s) scanned
> 2009-01-18 14:19:56,300 INFO org.apache.hadoop.hbase.master.BaseScanner:
> RegionManager.metaScanner scanning meta region {regionname: .META.,,1,
> startKey: <>, server: 10.1.0.56:60020}
> 2009-01-18 14:20:04,389 INFO org.apache.hadoop.hbase.master.ServerManager:
> 10.1.0.56:60020 lease expired
> 2009-01-18 14:20:04,411 INFO org.apache.hadoop.hbase.master.ServerManager:
> 10.1.0.52:60020 lease expired
> 2009-01-18 14:20:04,411 INFO org.apache.hadoop.hbase.master.ServerManager:
> 10.1.0.50:60020 lease expired
> 2009-01-18 14:20:05,402 INFO org.apache.hadoop.hbase.master.ServerManager:
> 10.1.0.60:60020 lease expired
> 2009-01-18 14:20:06,101 WARN org.apache.hadoop.hbase.master.BaseScanner:
> Scan one META region: {regionname: .META.,,1, startKey: <>, server:
> 10.1.0.56:60020}
> java.io.IOException: java.io.IOException: HStoreScanner failed construction
>        at
>
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.<init>(StoreFileScanner.java:70)
>        at
>
> org.apache.hadoop.hbase.regionserver.HStoreScanner.<init>(HStoreScanner.java:88)
>        at
> org.apache.hadoop.hbase.regionserver.HStore.getScanner(HStore.java:2125)
>        at
>
> org.apache.hadoop.hbase.regionserver.HRegion$HScanner.<init>(HRegion.java:1989)
>        at
> org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1180)
>        at
>
> org.apache.hadoop.hbase.regionserver.HRegionServer.openScanner(HRegionServer.java:1700)
>        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>        at
>
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>        at
>
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>        at java.lang.reflect.Method.invoke(Method.java:597)
>        at
> org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:632)
>        at
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:894)
> Caused by: java.io.IOException: Could not obtain block:
> blk_-80256631922521533_11342
> file=/hbase/.META./1028785192/info/mapfiles/722281705778744225/data
>        at
>
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.chooseDataNode(DFSClient.java:1708)
>        at
>
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:1536)
>        at
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.read(DFSClient.java:1663)
>        at java.io.DataInputStream.readFully(DataInputStream.java:178)
>        at java.io.DataInputStream.readFully(DataInputStream.java:152)
>        at
> org.apache.hadoop.hbase.io.SequenceFile$Reader.init(SequenceFile.java:1464)
>        at
>
> org.apache.hadoop.hbase.io.SequenceFile$Reader.<init>(SequenceFile.java:1442)
>        at
>
> org.apache.hadoop.hbase.io.SequenceFile$Reader.<init>(SequenceFile.java:1431)
>        at
>
> org.apache.hadoop.hbase.io.SequenceFile$Reader.<init>(SequenceFile.java:1426)
>        at
>
> org.apache.hadoop.hbase.io.MapFile$Reader.createDataFileReader(MapFile.java:310)
>        at
>
> org.apache.hadoop.hbase.io.HBaseMapFile$HBaseReader.createDataFileReader(HBaseMapFile.java:96)
>        at org.apache.hadoop.hbase.io.MapFile$Reader.open(MapFile.java:292)
>        at
>
> org.apache.hadoop.hbase.io.HBaseMapFile$HBaseReader.<init>(HBaseMapFile.java:79)
>        at
>
> org.apache.hadoop.hbase.io.BloomFilterMapFile$Reader.<init>(BloomFilterMapFile.java:65)
>        at
>
> org.apache.hadoop.hbase.regionserver.HStoreFile.getReader(HStoreFile.java:443)
>        at
>
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.openReaders(StoreFileScanner.java:96)
>        at
>
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.<init>(StoreFileScanner.java:67)
>        ... 11 more
>
>        at sun.reflect.GeneratedConstructorAccessor12.newInstance(Unknown
> Source)
>        at
>
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
>        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
>        at
>
> org.apache.hadoop.hbase.RemoteExceptionHandler.decodeRemoteException(RemoteExceptionHandler.java:95)
>        at
> org.apache.hadoop.hbase.master.BaseScanner.scanRegion(BaseScanner.java:185)
>        at
>
> org.apache.hadoop.hbase.master.MetaScanner.scanOneMetaRegion(MetaScanner.java:73)
>        at
>
> org.apache.hadoop.hbase.master.MetaScanner.maintenanceScan(MetaScanner.java:129)
>        at
> org.apache.hadoop.hbase.master.BaseScanner.chore(BaseScanner.java:137)
>        at org.apache.hadoop.hbase.Chore.run(Chore.java:65)
> 2009-01-18 14:20:06,106 INFO org.apache.hadoop.hbase.master.BaseScanner:
> All
> 1 .META. region(s) scanned
> 2009-01-18 14:20:56,306 INFO org.apache.hadoop.hbase.master.BaseScanner:
> RegionManager.metaScanner scanning meta region {regionname: .META.,,1,
> startKey: <>, server: 10.1.0.56:60020}
> 2009-01-18 14:21:05,379 WARN org.apache.hadoop.hbase.master.BaseScanner:
> Scan one META region: {regionname: .META.,,1, startKey: <>, server:
> 10.1.0.56:60020}
> java.io.IOException: java.io.IOException: HStoreScanner failed construction
>        at
>
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.<init>(StoreFileScanner.java:70)
>        at
>
> org.apache.hadoop.hbase.regionserver.HStoreScanner.<init>(HStoreScanner.java:88)
>        at
> org.apache.hadoop.hbase.regionserver.HStore.getScanner(HStore.java:2125)
>        at
>
> org.apache.hadoop.hbase.regionserver.HRegion$HScanner.<init>(HRegion.java:1989)
>        at
> org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1180)
>        at
>
> org.apache.hadoop.hbase.regionserver.HRegionServer.openScanner(HRegionServer.java:1700)
>        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$Server.call(HBaseRPC.java:632)
>        at
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:894)
> Caused by: java.io.IOException: Could not obtain block:
> blk_-80256631922521533_11342
> file=/hbase/.META./1028785192/info/mapfiles/722281705778744225/data
>        at
>
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.chooseDataNode(DFSClient.java:1708)
>        at
>
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:1536)
>        at
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.read(DFSClient.java:1663)
>        at java.io.DataInputStream.readFully(DataInputStream.java:178)
>        at java.io.DataInputStream.readFully(DataInputStream.java:152)
>        at
> org.apache.hadoop.hbase.io.SequenceFile$Reader.init(SequenceFile.java:1464)
>        at
>
> org.apache.hadoop.hbase.io.SequenceFile$Reader.<init>(SequenceFile.java:1442)
>        at
>
> org.apache.hadoop.hbase.io.SequenceFile$Reader.<init>(SequenceFile.java:1431)
>        at
>
> org.apache.hadoop.hbase.io.SequenceFile$Reader.<init>(SequenceFile.java:1426)
>        at
>
> org.apache.hadoop.hbase.io.MapFile$Reader.createDataFileReader(MapFile.java:310)
>        at
>
> org.apache.hadoop.hbase.io.HBaseMapFile$HBaseReader.createDataFileReader(HBaseMapFile.java:96)
>        at org.apache.hadoop.hbase.io.MapFile$Reader.open(MapFile.java:292)
>        at
>
> org.apache.hadoop.hbase.io.HBaseMapFile$HBaseReader.<init>(HBaseMapFile.java:79)
>        at
>
> org.apache.hadoop.hbase.io.BloomFilterMapFile$Reader.<init>(BloomFilterMapFile.java:65)
>        at
>
> org.apache.hadoop.hbase.regionserver.HStoreFile.getReader(HStoreFile.java:443)
>        at
>
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.openReaders(StoreFileScanner.java:96)
>        at
>
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.<init>(StoreFileScanner.java:67)
>        ... 11 more
>
>        at sun.reflect.GeneratedConstructorAccessor12.newInstance(Unknown
> Source)
>        at
>
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
>        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
>        at
>
> org.apache.hadoop.hbase.RemoteExceptionHandler.decodeRemoteException(RemoteExceptionHandler.java:95)
>        at
> org.apache.hadoop.hbase.master.BaseScanner.scanRegion(BaseScanner.java:185)
>        at
>
> org.apache.hadoop.hbase.master.MetaScanner.scanOneMetaRegion(MetaScanner.java:73)
>        at
>
> org.apache.hadoop.hbase.master.MetaScanner.maintenanceScan(MetaScanner.java:129)
>        at
> org.apache.hadoop.hbase.master.BaseScanner.chore(BaseScanner.java:137)
>        at org.apache.hadoop.hbase.Chore.run(Chore.java:65)
> 2009-01-18 14:21:05,381 INFO org.apache.hadoop.hbase.master.BaseScanner:
> All
> 1 .META. region(s) scanned
> 2009-01-18 14:21:56,311 INFO org.apache.hadoop.hbase.master.BaseScanner:
> RegionManager.metaScanner scanning meta region {regionname: .META.,,1,
> startKey: <>, server: 10.1.0.56:60020}
> 2009-01-18 14:22:05,354 WARN org.apache.hadoop.hbase.master.BaseScanner:
> Scan one META region: {regionname: .META.,,1, startKey: <>, server:
> 10.1.0.56:60020}
> java.io.IOException: java.io.IOException: HStoreScanner failed construction
>        at
>
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.<init>(StoreFileScanner.java:70)
>        at
>
> org.apache.hadoop.hbase.regionserver.HStoreScanner.<init>(HStoreScanner.java:88)
>        at
> org.apache.hadoop.hbase.regionserver.HStore.getScanner(HStore.java:2125)
>        at
>
> org.apache.hadoop.hbase.regionserver.HRegion$HScanner.<init>(HRegion.java:1989)
>        at
> org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1180)
>        at
>
> org.apache.hadoop.hbase.regionserver.HRegionServer.openScanner(HRegionServer.java:1700)
>        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>        at
>
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>        at
>
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>        at java.lang.reflect.Method.invoke(Method.java:597)
>        at
> org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:632)
>        at
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:894)
> Caused by: java.io.IOException: Could not obtain block:
> blk_-80256631922521533_11342
> file=/hbase/.META./1028785192/info/mapfiles/722281705778744225/data
>        at
>
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.chooseDataNode(DFSClient.java:1708)
>        at
>
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:1536)
>        at
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.read(DFSClient.java:1663)
>        at java.io.DataInputStream.readFully(DataInputStream.java:178)
>        at java.io.DataInputStream.readFully(DataInputStream.java:152)
>        at
> org.apache.hadoop.hbase.io.SequenceFile$Reader.init(SequenceFile.java:1464)
>        at
>
> org.apache.hadoop.hbase.io.SequenceFile$Reader.<init>(SequenceFile.java:1442)
>        at
>
> org.apache.hadoop.hbase.io.SequenceFile$Reader.<init>(SequenceFile.java:1431)
>        at
>
> org.apache.hadoop.hbase.io.SequenceFile$Reader.<init>(SequenceFile.java:1426)
>        at
>
> org.apache.hadoop.hbase.io.MapFile$Reader.createDataFileReader(MapFile.java:310)
>        at
>
> org.apache.hadoop.hbase.io.HBaseMapFile$HBaseReader.createDataFileReader(HBaseMapFile.java:96)
>        at org.apache.hadoop.hbase.io.MapFile$Reader.open(MapFile.java:292)
>        at
>
> org.apache.hadoop.hbase.io.HBaseMapFile$HBaseReader.<init>(HBaseMapFile.java:79)
>        at
>
> org.apache.hadoop.hbase.io.BloomFilterMapFile$Reader.<init>(BloomFilterMapFile.java:65)
>        at
>
> org.apache.hadoop.hbase.regionserver.HStoreFile.getReader(HStoreFile.java:443)
>        at
>
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.openReaders(StoreFileScanner.java:96)
>        at
>
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.<init>(StoreFileScanner.java:67)
>        ... 11 more
>
>        at sun.reflect.GeneratedConstructorAccessor12.newInstance(Unknown
> Source)
>        at
>
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
>        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
>        at
>
> org.apache.hadoop.hbase.RemoteExceptionHandler.decodeRemoteException(RemoteExceptionHandler.java:95)
>        at
> org.apache.hadoop.hbase.master.BaseScanner.scanRegion(BaseScanner.java:185)
>        at
>
> org.apache.hadoop.hbase.master.MetaScanner.scanOneMetaRegion(MetaScanner.java:73)
>        at
>
> org.apache.hadoop.hbase.master.MetaScanner.maintenanceScan(MetaScanner.java:129)
>        at
> org.apache.hadoop.hbase.master.BaseScanner.chore(BaseScanner.java:137)
>        at org.apache.hadoop.hbase.Chore.run(Chore.java:65)
> 2009-01-18 14:22:05,356 INFO org.apache.hadoop.hbase.master.BaseScanner:
> All
> 1 .META. region(s) scanned
> 2009-01-18 14:22:56,317 INFO org.apache.hadoop.hbase.master.BaseScanner:
> RegionManager.metaScanner scanning meta region {regionname: .META.,,1,
> startKey: <>, server: 10.1.0.56:60020}
> 2009-01-18 14:23:07,103 WARN org.apache.hadoop.hbase.master.BaseScanner:
> Scan one META region: {regionname: .META.,,1, startKey: <>, server:
> 10.1.0.56:60020}
> java.io.IOException: java.io.IOException: HStoreScanner failed construction
>        at
>
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.<init>(StoreFileScanner.java:70)
>        at
>
> org.apache.hadoop.hbase.regionserver.HStoreScanner.<init>(HStoreScanner.java:88)
>        at
> org.apache.hadoop.hbase.regionserver.HStore.getScanner(HStore.java:2125)
>        at
>
> org.apache.hadoop.hbase.regionserver.HRegion$HScanner.<init>(HRegion.java:1989)
>        at
> org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1180)
>        at
>
> org.apache.hadoop.hbase.regionserver.HRegionServer.openScanner(HRegionServer.java:1700)
>        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$Server.call(HBaseRPC.java:632)
>        at
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:894)
> Caused by: java.io.IOException: Could not obtain block:
> blk_-80256631922521533_11342
> file=/hbase/.META./1028785192/info/mapfiles/722281705778744225/data
>        at
>
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.chooseDataNode(DFSClient.java:1708)
>        at
>
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:1536)
>        at
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.read(DFSClient.java:1663)
>        at java.io.DataInputStream.readFully(DataInputStream.java:178)
>        at java.io.DataInputStream.readFully(DataInputStream.java:152)
>        at
> org.apache.hadoop.hbase.io.SequenceFile$Reader.init(SequenceFile.java:1464)
>        at
>
> org.apache.hadoop.hbase.io.SequenceFile$Reader.<init>(SequenceFile.java:1442)
>        at
>
> org.apache.hadoop.hbase.io.SequenceFile$Reader.<init>(SequenceFile.java:1431)
>        at
>
> org.apache.hadoop.hbase.io.SequenceFile$Reader.<init>(SequenceFile.java:1426)
>        at
>
> org.apache.hadoop.hbase.io.MapFile$Reader.createDataFileReader(MapFile.java:310)
>        at
>
> org.apache.hadoop.hbase.io.HBaseMapFile$HBaseReader.createDataFileReader(HBaseMapFile.java:96)
>        at org.apache.hadoop.hbase.io.MapFile$Reader.open(MapFile.java:292)
>        at
>
> org.apache.hadoop.hbase.io.HBaseMapFile$HBaseReader.<init>(HBaseMapFile.java:79)
>        at
>
> org.apache.hadoop.hbase.io.BloomFilterMapFile$Reader.<init>(BloomFilterMapFile.java:65)
>        at
>
> org.apache.hadoop.hbase.regionserver.HStoreFile.getReader(HStoreFile.java:443)
>        at
>
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.openReaders(StoreFileScanner.java:96)
>        at
>
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.<init>(StoreFileScanner.java:67)
>        ... 11 more
>
>        at sun.reflect.GeneratedConstructorAccessor12.newInstance(Unknown
> Source)
>        at
>
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
>        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
>        at
>
> org.apache.hadoop.hbase.RemoteExceptionHandler.decodeRemoteException(RemoteExceptionHandler.java:95)
>        at
> org.apache.hadoop.hbase.master.BaseScanner.scanRegion(BaseScanner.java:185)
>        at
>
> org.apache.hadoop.hbase.master.MetaScanner.scanOneMetaRegion(MetaScanner.java:73)
>        at
>
> org.apache.hadoop.hbase.master.MetaScanner.maintenanceScan(MetaScanner.java:129)
>        at
> org.apache.hadoop.hbase.master.BaseScanner.chore(BaseScanner.java:137)
>        at org.apache.hadoop.hbase.Chore.run(Chore.java:65)
> 2009-01-18 14:23:07,106 INFO org.apache.hadoop.hbase.master.BaseScanner:
> All
> 1 .META. region(s) scanned
> 2009-01-18 14:23:56,323 INFO org.apache.hadoop.hbase.master.BaseScanner:
> RegionManager.metaScanner scanning meta region {regionname: .META.,,1,
> startKey: <>, server: 10.1.0.56:60020}
> 2009-01-18 14:24:03,923 WARN org.apache.hadoop.hbase.RegionHistorian:
> Unable
> to 'Region opened on server : 3c.c3.33.static.xlhost.com'
> org.apache.hadoop.hbase.client.RetriesExhaustedException: Trying to contact
> region server 10.1.0.56:60020 for region .META.,,1, row
> 'step0,f50eba0233a6f9c4cc369d68ca63b2a4,1232286170694', but failed after 10
> attempts.
> Exceptions:
> java.io.IOException: java.io.IOException: Could not read from stream
>        at
> org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:119)
>        at java.io.DataInputStream.readByte(DataInputStream.java:248)
>        at
> org.apache.hadoop.io.WritableUtils.readVLong(WritableUtils.java:325)
>        at
> org.apache.hadoop.io.WritableUtils.readVInt(WritableUtils.java:346)
>        at org.apache.hadoop.io.Text.readString(Text.java:400)
>        at
>
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.createBlockOutputStream(DFSClient.java:2779)
>        at
>
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2704)
>        at
>
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:1997)
>        at
>
> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2183)
>
> java.io.IOException: java.io.IOException: Could not obtain block:
> blk_2410490605807408170_12109
> file=/hbase/-ROOT-/70236052/info/mapfiles/4049664282920944880/data
>        at
>
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.chooseDataNode(DFSClient.java:1708)
>        at
>
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:1536)
>        at
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.read(DFSClient.java:1663)
>        at
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.read(DFSClient.java:1593)
>        at java.io.DataInputStream.readInt(DataInputStream.java:370)
>        at
>
> org.apache.hadoop.hbase.io.SequenceFile$Reader.readRecordLength(SequenceFile.java:1909)
>        at
> org.apache.hadoop.hbase.io.SequenceFile$Reader.next(SequenceFile.java:1939)
>        at
> org.apache.hadoop.hbase.io.SequenceFile$Reader.next(SequenceFile.java:1844)
>        at
> org.apache.hadoop.hbase.io.SequenceFile$Reader.next(SequenceFile.java:1890)
>        at org.apache.hadoop.hbase.io.MapFile$Reader.next(MapFile.java:525)
>        at
>
> org.apache.hadoop.hbase.regionserver.HStore.rowAtOrBeforeFromMapFile(HStore.java:1714)
>        at
>
> org.apache.hadoop.hbase.regionserver.HStore.getRowKeyAtOrBefore(HStore.java:1686)
>        at
>
> org.apache.hadoop.hbase.regionserver.HRegion.getClosestRowBefore(HRegion.java:1088)
>        at
>
> org.apache.hadoop.hbase.regionserver.HRegionServer.getClosestRowBefore(HRegionServer.java:1548)
>        at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
>        at
>
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>        at java.lang.reflect.Method.invoke(Method.java:597)
>        at
> org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:632)
>        at
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:894)
>
> org.apache.hadoop.hbase.client.NoServerForRegionException: Timed out trying
> to locate root region
> *
>

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