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https://issues.apache.org/jira/browse/HDFS-872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12804337#action_12804337
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Hairong Kuang commented on HDFS-872:
------------------------------------
Ok, I just committed the patch submitted on 1/16 that fixed the incompatible
protocol problem caused by HDFS-793. Thanks Todd!
> DFSClient 0.20.1 is incompatible with HDFS 0.20.2
> -------------------------------------------------
>
> Key: HDFS-872
> URL: https://issues.apache.org/jira/browse/HDFS-872
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node, hdfs client
> Affects Versions: 0.20.1, 0.20.2
> Reporter: Bassam Tabbara
> Assignee: Todd Lipcon
> Fix For: 0.20.2
>
> Attachments: hdfs-793-branch20.txt, hdfs-793-branch20.txt,
> hdfs-872.txt
>
>
> After upgrading to that latest HDFS 0.20.2 (r896310 from
> /branches/branch-0.20), old DFS clients (0.20.1) seem to not work anymore.
> HBase uses the 0.20.1 hadoop core jars and the HBase master will no longer
> startup. Here is the exception from the HBase master log:
> {code}
> 2010-01-06 09:59:46,762 WARN org.apache.hadoop.hdfs.DFSClient: DFS Read:
> java.io.IOException: Could not obtain block: blk_338051
> 2596555557728_1002 file=/hbase/hbase.version
> at
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.chooseDataNode(DFSClient.java:1788)
> at
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:1616)
> at
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.read(DFSClient.java:1743)
> at
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.read(DFSClient.java:1673)
> at java.io.DataInputStream.readUnsignedShort(DataInputStream.java:320)
> at java.io.DataInputStream.readUTF(DataInputStream.java:572)
> at org.apache.hadoop.hbase.util.FSUtils.getVersion(FSUtils.java:189)
> at org.apache.hadoop.hbase.util.FSUtils.checkVersion(FSUtils.java:208)
> at org.apache.hadoop.hbase.master.HMaster.<init>(HMaster.java:208)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> Method)
> at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> at org.apache.hadoop.hbase.master.HMaster.doMain(HMaster.java:1241)
> at org.apache.hadoop.hbase.master.HMaster.main(HMaster.java:1282)
> 2010-01-06 09:59:46,763 FATAL org.apache.hadoop.hbase.master.HMaster: Not
> starting HMaster because:
> java.io.IOException: Could not obtain block: blk_3380512596555557728_1002
> file=/hbase/hbase.version
> at
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.chooseDataNode(DFSClient.java:1788)
> at
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:1616)
> at
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.read(DFSClient.java:1743)
> at
> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.read(DFSClient.java:1673)
> at java.io.DataInputStream.readUnsignedShort(DataInputStream.java:320)
> at java.io.DataInputStream.readUTF(DataInputStream.java:572)
> at org.apache.hadoop.hbase.util.FSUtils.getVersion(FSUtils.java:189)
> at org.apache.hadoop.hbase.util.FSUtils.checkVersion(FSUtils.java:208)
> at org.apache.hadoop.hbase.master.HMaster.<init>(HMaster.java:208)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> Method)
> at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> at org.apache.hadoop.hbase.master.HMaster.doMain(HMaster.java:1241)
> at org.apache.hadoop.hbase.master.HMaster.main(HMaster.java:1282)
> {code}
> If I switch the hadoop jars in the hbase/lib directory with 0.20.2 version it
> works well, which what led me to open this bug here and not in the HBASE
> project.
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