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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-872) DFSClient 0.20.1 is incompatible with HDFS 0.20.2
Date Fri, 15 Jan 2010 00:04:55 GMT

    [ https://issues.apache.org/jira/browse/HDFS-872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12800441#action_12800441
] 

Todd Lipcon commented on HDFS-872:
----------------------------------

Sure - I can also generate such a squashed 793-101-872 patch here for review, though it won't
apply. I thought it would be easier to review since this doesn't change the semantics, just
protocol. Let me know if you revert, and I'll regenerate



> 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
>            Assignee: Todd Lipcon
>             Fix For: 0.20.2
>
>         Attachments: 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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