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From Andrew Purtell <apurt...@apache.org>
Subject Re: HBase file encryption, inconsistencies observed and data loss
Date Wed, 30 Jul 2014 19:56:18 GMT
Let's take this to JIRA


On Wed, Jul 30, 2014 at 12:50 PM, Ted Yu <yuzhihong@gmail.com> wrote:

> In BaseDecoder#rethrowEofException() :
>
>     if (!isEof) throw ioEx;
>
>     LOG.error("Partial cell read caused by EOF: " + ioEx);
>
>     EOFException eofEx = new EOFException("Partial cell read");
>
>     eofEx.initCause(ioEx);
>
>     throw eofEx;
>
> throwing EOFException would not propagate the "Partial cell read" condition
> to HLogSplitter which doesn't treat EOFException as an error.
>
> I think a new exception type (DecoderException e.g.) should be used above.
>
> Cheers
>
>
> On Wed, Jul 30, 2014 at 10:22 AM, Ted Yu <yuzhihong@gmail.com> wrote:
>
> > Looking at HLogSplitter#getNextLogLine() :
> >
> >     try {
> >
> >       return in.next();
> >
> >     } catch (EOFException eof) {
> >
> >       // truncated files are expected if a RS crashes (see HBASE-2643)
> >
> >       LOG.info("EOF from hlog " + path + ".  continuing");
> >
> >       return null;
> >
> > The EOFException is not treated as an error. But the posted log doesn't
> > contain "EOF from hlog " - there may be other code path leading to
> > codec.BaseDecoder
> >
> > Cheers
> >
> >
> > On Wed, Jul 30, 2014 at 9:20 AM, Kiran Kumar.M.R <
> > Kiran.Kumar.MR@huawei.com> wrote:
> >
> >> Hi,
> >>
> >> After step 4 ( i.e disabling of WAL encryption, removing
> >> SecureProtobufReader/Writer and restart), read of encrypted WAL fails
> >> mainly due to EOF exception at Basedecoder. This is not considered as
> error
> >> and these WAL are being moved to /oldWALs.
> >>
> >> Following is observed in log files:
> >> 2014-07-30 19:44:29,254 INFO  [RS_LOG_REPLAY_OPS-HOST-16:15264-1]
> >> wal.HLogSplitter: Splitting hlog:
> >>
> hdfs://HOST-16:18020/hbase/WALs/HOST-16,15264,1406725441997-splitting/HOST-16%2C15264%2C1406725441997.1406725444017,
> >> length=172
> >> 2014-07-30 19:44:29,254 INFO  [RS_LOG_REPLAY_OPS-HOST-16:15264-1]
> >> wal.HLogSplitter: DistributedLogReplay = false
> >> 2014-07-30 19:44:29,313 INFO  [RS_LOG_REPLAY_OPS-HOST-16:15264-1]
> >> util.FSHDFSUtils: Recovering lease on dfs file
> >>
> hdfs://HOST-16:18020/hbase/WALs/HOST-16,15264,1406725441997-splitting/HOST-16%2C15264%2C1406725441997.1406725444017
> >> 2014-07-30 19:44:29,315 INFO  [RS_LOG_REPLAY_OPS-HOST-16:15264-1]
> >> util.FSHDFSUtils: recoverLease=true, attempt=0 on
> >>
> file=hdfs://HOST-16:18020/hbase/WALs/HOST-16,15264,1406725441997-splitting/HOST-16%2C15264%2C1406725441997.1406725444017
> >> after 1ms
> >> 2014-07-30 19:44:29,429 DEBUG
> >> [RS_LOG_REPLAY_OPS-HOST-16:15264-1-Writer-0] wal.HLogSplitter: Writer
> >> thread Thread[RS_LOG_REPLAY_OPS-HOST-16:15264-1-Writer-0,5,main]:
> starting
> >> 2014-07-30 19:44:29,429 DEBUG
> >> [RS_LOG_REPLAY_OPS-HOST-16:15264-1-Writer-1] wal.HLogSplitter: Writer
> >> thread Thread[RS_LOG_REPLAY_OPS-HOST-16:15264-1-Writer-1,5,main]:
> starting
> >> 2014-07-30 19:44:29,430 DEBUG
> >> [RS_LOG_REPLAY_OPS-HOST-16:15264-1-Writer-2] wal.HLogSplitter: Writer
> >> thread Thread[RS_LOG_REPLAY_OPS-HOST-16:15264-1-Writer-2,5,main]:
> starting
> >> 2014-07-30 19:44:29,591 ERROR [RS_LOG_REPLAY_OPS-HOST-16:15264-1]
> >> codec.BaseDecoder: Partial cell read caused by EOF: java.io.IOException:
> >> Premature EOF from inputStream
> >> 2014-07-30 19:44:29,592 INFO  [RS_LOG_REPLAY_OPS-HOST-16:15264-1]
> >> wal.HLogSplitter: Finishing writing output logs and closing down.
> >> 2014-07-30 19:44:29,592 INFO  [RS_LOG_REPLAY_OPS-HOST-16:15264-1]
> >> wal.HLogSplitter: Waiting for split writer threads to finish
> >> 2014-07-30 19:44:29,592 INFO  [RS_LOG_REPLAY_OPS-HOST-16:15264-1]
> >> wal.HLogSplitter: Split writers finished
> >> 2014-07-30 19:44:29,592 INFO  [RS_LOG_REPLAY_OPS-HOST-16:15264-1]
> >> wal.HLogSplitter: Processed 0 edits across 0 regions; log
> >>
> file=hdfs://HOST-16:18020/hbase/WALs/HOST-16,15264,1406725441997-splitting/HOST-16%2C15264%2C1406725441997.1406725444017
> >> is corrupted = false progress failed = false
> >>
> >> To fix this, we need to propagate EOF exception to HLogSplitter. Any
> >> suggestions on the fix?
> >>
> >>
> >> Regards,
> >> Kiran
> >>
> >>
> __________________________________________________________________________________________________________
> >> This e-mail and its attachments contain confidential information from
> >> HUAWEI, which is intended only for the person or entity whose address is
> >> listed above. Any use of the information contained herein in any way
> >> (including, but not limited to, total or partial disclosure,
> reproduction,
> >> or dissemination) by persons other than the intended recipient(s) is
> >> prohibited. If you receive this e-mail in error, please notify the
> sender
> >> by phone or email immediately and delete it!
> >>
> >>
> __________________________________________________________________________________________________________
> >>
> >>
> >>
> >>
> >> > -----Original Message-----
> >> > From: Shankar hiremath [mailto:shankar.hiremath@huawei.com]
> >> > Sent: Friday, July 25, 2014 19:38
> >> > To: user@hbase.apache.org
> >> > Subject: HBase file encryption, inconsistencies observed and data loss
> >> >
> >> > HBase file encryption some inconsistencies observed and data loss
> >> > happens after running the hbck tool,
> >> > the operation steps are as below.    (one thing what I observed is, on
> >> > startup of HMaster if it is not able to process the WAL file, then
> also
> >> > it moved to /oldWALs)
> >> >
> >> > Procedure:
> >> > 1. Start the Hbase services (HMaster & region Server) 2. Enable HFile
> >> > encryption and WAL file encryption as below, and perform 'table4-0'
> put
> >> > operations (100 records added) <property>
> >> > <name>hbase.crypto.keyprovider</name>
> >> > <value>org.apache.hadoop.hbase.io.crypto.KeyStoreKeyProvider</value>
> >> > </property>
> >> > <property>
> >> > <name>hbase.crypto.keyprovider.parameters</name>
> >> > <value>jceks:///opt/shankar1/kdc_keytab/hbase.jks?password=Hadoop@234
> </
> >> > value>
> >> > </property>
> >> > <property>
> >> > <name>hbase.crypto.master.key.name</name>
> >> > <value>hdfs</value>
> >> > </property>
> >> > <property>
> >> > <name>hfile.format.version</name>
> >> > <value>3</value>
> >> > </property>
> >> > <property>
> >> > <name>hbase.regionserver.hlog.reader.impl</name>
> >> >
> <value>org.apache.hadoop.hbase.regionserver.wal.SecureProtobufLogReader
> >> > </value>
> >> > </property>
> >> > <property>
> >> > <name>hbase.regionserver.hlog.writer.impl</name>
> >> >
> <value>org.apache.hadoop.hbase.regionserver.wal.SecureProtobufLogWriter
> >> > </value>
> >> > </property>
> >> > <property>
> >> > <name>hbase.regionserver.wal.encryption</name>
> >> > <value>true</value>
> >> > </property>
> >> > 3. Machine went down, so all process went down
> >> >
> >> > 4. We disabled the WAL file encryption for performance reason, and
> keep
> >> > encryption only for Hfile, as below <property>
> >> > <name>hbase.crypto.keyprovider</name>
> >> > <value>org.apache.hadoop.hbase.io.crypto.KeyStoreKeyProvider</value>
> >> > </property>
> >> > <property>
> >> > <name>hbase.crypto.keyprovider.parameters</name>
> >> > <value>jceks:///opt/shankar1/kdc_keytab/hbase.jks?password=Hadoop@234
> </
> >> > value>
> >> > </property>
> >> > <property>
> >> > <name>hbase.crypto.master.key.name</name>
> >> > <value>hdfs</value>
> >> > </property>
> >> > <property>
> >> > <name>hfile.format.version</name>
> >> > <value>3</value>
> >> > </property>
> >> > 5. Start the Region Server and query the 'table4-0' data
> >> > hbase(main):003:0> count 'table4-0'
> >> > ERROR: org.apache.hadoop.hbase.NotServingRegionException: Region
> >> > table4-0,,1406207815456.fc10620a3dcc14e004ab034420f7d332. is not
> online
> >> > on XX-XX-XX-XX,60020,1406209023146 at
> >> >
> org.apache.hadoop.hbase.regionserver.HRegionServer.getRegionByEncodedNa
> >> > me(HRegionServer.java:2685)
> >> > at
> >> >
> org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionSer
> >> > ver.java:4119)
> >> > at
> >> >
> org.apache.hadoop.hbase.regionserver.HRegionServer.scan(HRegionServer.j
> >> > ava:3066)
> >> > at
> >> >
> org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2
> >> > .callBlockingMethod(ClientProtos.java:29497)
> >> > at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2084)
> >> > at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:98)
> >> > at
> >> >
> org.apache.hadoop.hbase.ipc.SimpleRpcScheduler.consumerLoop(SimpleRpcSc
> >> > heduler.java:168)
> >> > at
> >> >
> org.apache.hadoop.hbase.ipc.SimpleRpcScheduler.access$000(SimpleRpcSche
> >> > duler.java:39)
> >> > at
> >> >
> org.apache.hadoop.hbase.ipc.SimpleRpcScheduler$1.run(SimpleRpcScheduler
> >> > .java:111)
> >> > at java.lang.Thread.run(Thread.java:662)
> >> > 6. Not able to read the data, so we decided to revert back the
> >> > configuration (as original) 7. Kill/Stop the Region Server, revert all
> >> > the configurations as original, as below <property>
> >> > <name>hbase.crypto.keyprovider</name>
> >> > <value>org.apache.hadoop.hbase.io.crypto.KeyStoreKeyProvider</value>
> >> > </property>
> >> > <property>
> >> > <name>hbase.crypto.keyprovider.parameters</name>
> >> > <value>jceks:///opt/shankar1/kdc_keytab/hbase.jks?password=Hadoop@234
> </
> >> > value>
> >> > </property>
> >> > <property>
> >> > <name>hbase.crypto.master.key.name</name>
> >> > <value>hdfs</value>
> >> > </property>
> >> > <property>
> >> > <name>hfile.format.version</name>
> >> > <value>3</value>
> >> > </property>
> >> > <property>
> >> > <name>hbase.regionserver.hlog.reader.impl</name>
> >> >
> <value>org.apache.hadoop.hbase.regionserver.wal.SecureProtobufLogReader
> >> > </value>
> >> > </property>
> >> > <property>
> >> > <name>hbase.regionserver.hlog.writer.impl</name>
> >> >
> <value>org.apache.hadoop.hbase.regionserver.wal.SecureProtobufLogWriter
> >> > </value>
> >> > </property>
> >> > <property>
> >> > <name>hbase.regionserver.wal.encryption</name>
> >> > <value>true</value>
> >> > </property>
> >> > 7. Start the Region Server, and perform the 'table4-0' query
> >> > hbase(main):003:0> count 'table4-0'
> >> > ERROR: org.apache.hadoop.hbase.NotServingRegionException: Region
> >> > table4-0,,1406207815456.fc10620a3dcc14e004ab034420f7d332. is not
> online
> >> > on XX-XX-XX-XX,60020,1406209023146 at
> >> >
> org.apache.hadoop.hbase.regionserver.HRegionServer.getRegionByEncodedNa
> >> > me(HRegionServer.java:2685)
> >> > at
> >> >
> org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionSer
> >> > ver.java:4119)
> >> > at
> >> >
> org.apache.hadoop.hbase.regionserver.HRegionServer.scan(HRegionServer.j
> >> > ava:3066)
> >> > at
> >> >
> org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2
> >> > .callBlockingMethod(ClientProtos.java:29497)
> >> > at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2084)
> >> > at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:98)
> >> > at
> >> >
> org.apache.hadoop.hbase.ipc.SimpleRpcScheduler.consumerLoop(SimpleRpcSc
> >> > heduler.java:168)
> >> > at
> >> >
> org.apache.hadoop.hbase.ipc.SimpleRpcScheduler.access$000(SimpleRpcSche
> >> > duler.java:39)
> >> > at
> >> >
> org.apache.hadoop.hbase.ipc.SimpleRpcScheduler$1.run(SimpleRpcScheduler
> >> > .java:111)
> >> > at java.lang.Thread.run(Thread.java:662)
> >> > 8. Run the hbase hbck to repair, as below ./hbase hbck -
> >> > details .........................
> >> > Summary:
> >> > table1-0 is okay.
> >> > Number of regions: 0
> >> > Deployed on:
> >> > table2-0 is okay.
> >> > Number of regions: 0
> >> > Deployed on:
> >> > table3-0 is okay.
> >> > Number of regions: 0
> >> > Deployed on:
> >> > table4-0 is okay.
> >> > Number of regions: 0
> >> > Deployed on:
> >> > table5-0 is okay.
> >> > Number of regions: 0
> >> > Deployed on:
> >> > table6-0 is okay.
> >> > Number of regions: 0
> >> > Deployed on:
> >> > table7-0 is okay.
> >> > Number of regions: 0
> >> > Deployed on:
> >> > table8-0 is okay.
> >> > Number of regions: 0
> >> > Deployed on:
> >> > table9-0 is okay.
> >> > Number of regions: 0
> >> > Deployed on:
> >> > hbase:meta is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146 hbase:acl is okay.
> >> > Number of regions: 0
> >> > Deployed on:
> >> > hbase:namespace is okay.
> >> > Number of regions: 0
> >> > Deployed on:
> >> > 22 inconsistencies detected.
> >> > Status: INCONSISTENT
> >> > 2014-07-24 19:13:05,532 INFO [main]
> >> > client.HConnectionManager$HConnectionImplementation: Closing master
> >> > protocol: MasterService
> >> > 2014-07-24 19:13:05,533 INFO [main]
> >> > client.HConnectionManager$HConnectionImplementation: Closing zookeeper
> >> > sessionid=0x1475d1611611bcf
> >> > 2014-07-24 19:13:05,533 DEBUG [main] zookeeper.ZooKeeper: Closing
> >> > session: 0x1475d1611611bcf
> >> > 2014-07-24 19:13:05,533 DEBUG [main] zookeeper.ClientCnxn: Closing
> >> > client for session: 0x1475d1611611bcf
> >> > 2014-07-24 19:13:05,546 DEBUG [main-SendThread(XX-XX-XX-XX:2181)]
> >> > zookeeper.ClientCnxn: Reading reply sessionid:0x1475d1611611bcf,
> >> > packet:: clientPath:null serverPath:null finished:false header:: 6,-11
> >> > replyHeader:: 6,4295102074,0 request:: null response:: null
> >> > 2014-07-24 19:13:05,546 DEBUG [main] zookeeper.ClientCnxn:
> >> > Disconnecting client for session: 0x1475d1611611bcf
> >> > 2014-07-24 19:13:05,546 DEBUG [main-SendThread(XX-XX-XX-XX:2181)]
> >> > zookeeper.ClientCnxn: An exception was thrown while closing send
> thread
> >> > for session 0x1475d1611611bcf : Unable to read additional data from
> >> > server sessionid 0x1475d1611611bcf, likely server has closed socket
> >> > 2014-07-24 19:13:05,546 INFO [main-EventThread] zookeeper.ClientCnxn:
> >> > EventThread shut down
> >> > 2014-07-24 19:13:05,546 INFO [main] zookeeper.ZooKeeper: Session:
> >> > 0x1475d1611611bcf closed shankar1@XX-XX-XX-XX:~/DataSight/hbase/bin>
> >> > 9. Fix the assignments as below
> >> > ./hbase hbck -fixAssignments
> >> > Summary:
> >> > table1-0 is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146
> >> > table2-0 is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146
> >> > table3-0 is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146
> >> > table4-0 is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146
> >> > table5-0 is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146
> >> > table6-0 is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146
> >> > table7-0 is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146
> >> > table8-0 is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146
> >> > table9-0 is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146 hbase:meta is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146 hbase:acl is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146 hbase:namespace is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146
> >> > 0 inconsistencies detected.
> >> > Status: OK
> >> > 2014-07-24 19:44:55,194 INFO [main]
> >> > client.HConnectionManager$HConnectionImplementation: Closing master
> >> > protocol: MasterService
> >> > 2014-07-24 19:44:55,194 INFO [main]
> >> > client.HConnectionManager$HConnectionImplementation: Closing zookeeper
> >> > sessionid=0x2475d15f7b31b73
> >> > 2014-07-24 19:44:55,194 DEBUG [main] zookeeper.ZooKeeper: Closing
> >> > session: 0x2475d15f7b31b73
> >> > 2014-07-24 19:44:55,194 DEBUG [main] zookeeper.ClientCnxn: Closing
> >> > client for session: 0x2475d15f7b31b73
> >> > 2014-07-24 19:44:55,203 DEBUG [main-SendThread(XX-XX-XX-XX:2181)]
> >> > zookeeper.ClientCnxn: Reading reply sessionid:0x2475d15f7b31b73,
> >> > packet:: clientPath:null serverPath:null finished:false header:: 7,-11
> >> > replyHeader:: 7,4295102377,0 request:: null response:: null
> >> > 2014-07-24 19:44:55,203 DEBUG [main] zookeeper.ClientCnxn:
> >> > Disconnecting client for session: 0x2475d15f7b31b73
> >> > 2014-07-24 19:44:55,204 DEBUG [main-SendThread(XX-XX-XX-XX:2181)]
> >> > zookeeper.ClientCnxn: An exception was thrown while closing send
> thread
> >> > for session 0x2475d15f7b31b73 : Unable to read additional data from
> >> > server sessionid 0x2475d15f7b31b73, likely server has closed socket
> >> > 2014-07-24 19:44:55,204 INFO [main] zookeeper.ZooKeeper: Session:
> >> > 0x2475d15f7b31b73 closed
> >> > 2014-07-24 19:44:55,204 INFO [main-EventThread] zookeeper.ClientCnxn:
> >> > EventThread shut down 10. Fix the assignments as below ./hbase hbck -
> >> > fixAssignments -fixMeta
> >> > Summary:
> >> > table1-0 is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146
> >> > table2-0 is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146
> >> > table3-0 is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146
> >> > table4-0 is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146
> >> > table5-0 is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146
> >> > table6-0 is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146
> >> > table7-0 is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146
> >> > table8-0 is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146
> >> > table9-0 is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146 hbase:meta is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146 hbase:acl is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146 hbase:namespace is okay.
> >> > Number of regions: 1
> >> > Deployed on: XX-XX-XX-XX,60020,1406209023146
> >> > 0 inconsistencies detected.
> >> > Status: OK
> >> > 2014-07-24 19:46:16,290 INFO [main]
> >> > client.HConnectionManager$HConnectionImplementation: Closing master
> >> > protocol: MasterService
> >> > 2014-07-24 19:46:16,290 INFO [main]
> >> > client.HConnectionManager$HConnectionImplementation: Closing zookeeper
> >> > sessionid=0x3475d1605321be9
> >> > 2014-07-24 19:46:16,290 DEBUG [main] zookeeper.ZooKeeper: Closing
> >> > session: 0x3475d1605321be9
> >> > 2014-07-24 19:46:16,290 DEBUG [main] zookeeper.ClientCnxn: Closing
> >> > client for session: 0x3475d1605321be9
> >> > 2014-07-24 19:46:16,300 DEBUG [main-SendThread(XX-XX-XX-XX:2181)]
> >> > zookeeper.ClientCnxn: Reading reply sessionid:0x3475d1605321be9,
> >> > packet:: clientPath:null serverPath:null finished:false header:: 6,-11
> >> > replyHeader:: 6,4295102397,0 request:: null response:: null
> >> > 2014-07-24 19:46:16,300 DEBUG [main] zookeeper.ClientCnxn:
> >> > Disconnecting client for session: 0x3475d1605321be9
> >> > 2014-07-24 19:46:16,300 DEBUG [main-SendThread(XX-XX-XX-XX:2181)]
> >> > zookeeper.ClientCnxn: An exception was thrown while closing send
> thread
> >> > for session 0x3475d1605321be9 : Unable to read additional data from
> >> > server sessionid 0x3475d1605321be9, likely server has closed socket
> >> > 2014-07-24 19:46:16,300 INFO [main] zookeeper.ZooKeeper: Session:
> >> > 0x3475d1605321be9 closed
> >> > 2014-07-24 19:46:16,300 INFO [main-EventThread] zookeeper.ClientCnxn:
> >> > EventThread shut down hbase(main):006:0> count 'table4-0'
> >> > 0 row(s) in 0.0200 seconds
> >> > => 0
> >> > hbase(main):007:0>
> >> > Complete data loss happened,
> >> > WALs, oldWALs & /hbase/data/default/table4-0/ does not have any data
> >> >
> >> >
> >> >
> >> > [X]
> >> > This e-mail and its attachments contain confidential information from
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-- 
Best regards,

   - Andy

Problems worthy of attack prove their worth by hitting back. - Piet Hein
(via Tom White)

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