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From "Bassam Tabbara (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-872) DFSClient 0.20.1 is incompatible with HDFS 0.20.2
Date Wed, 06 Jan 2010 18:09:54 GMT
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
    Affects Versions: 0.20.1, 0.20.2
            Reporter: Bassam Tabbara
             Fix For: 0.20.2


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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