DFSClient 0.20.1 is incompatible with HDFS 0.20.2
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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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