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  1. Hadoop HDFS
  2. HDFS-872

DFSClient 0.20.1 is incompatible with HDFS 0.20.2

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.20.1, 0.20.2
    • Fix Version/s: 0.20.2
    • Component/s: datanode, hdfs-client
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      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:

      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)
      

      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.

        Attachments

        1. hdfs-793-branch20.txt
          15 kB
          Todd Lipcon
        2. hdfs-793-branch20.txt
          15 kB
          Todd Lipcon
        3. hdfs-872.txt
          8 kB
          Todd Lipcon

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              • Assignee:
                tlipcon Todd Lipcon
                Reporter:
                bassam Bassam Tabbara
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                Dates

                • Created:
                  Updated:
                  Resolved: