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From "Chris Schneider (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-258) Cannot obtain block errors
Date Wed, 04 Oct 2006 14:37:21 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-258?page=comments#action_12439844 ] 
            
Chris Schneider commented on HADOOP-258:
----------------------------------------

Just FYI, I recently integrated hadoop 0.5 into my copy of the source, rebuit and installed.
I ran into similar "Could not obtain block" errors until I realized that I hadn't deployed
the (new in hadoop 0.5) .../webapps/datanode/ servlet on my cluster.

> Cannot obtain block errors
> --------------------------
>
>                 Key: HADOOP-258
>                 URL: http://issues.apache.org/jira/browse/HADOOP-258
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.3.0
>            Reporter: Owen O'Malley
>         Assigned To: Sameer Paranjpye
>             Fix For: 0.6.0
>
>
> I've been seeing a lot of errors from dfs for the last couple days. The exception that
I see is:
> java.io.IOException: Could not obtain block: blk_2867431916903738534 file=/user/oom/big-rand/part000271
offset=0 at org.apache.hadoop.dfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:532)
at org.apache.hadoop.dfs.DFSClient$DFSInputStream.read(DFSClient.java:641) at org.apache.hadoop.fs.FSDataInputStream$Checker.read(FSDataInputStream.java:83)
at org.apache.hadoop.fs.FSDataInputStream$PositionCache.read(FSDataInputStream.java:158) at
java.io.BufferedInputStream.fill(BufferedInputStream.java:218) at java.io.BufferedInputStream.read1(BufferedInputStream.java:256)
at java.io.BufferedInputStream.read(BufferedInputStream.java:313) at java.io.DataInputStream.readFully(DataInputStream.java:176)
at java.io.DataInputStream.readFully(DataInputStream.java:152) at org.apache.hadoop.io.SequenceFile$Reader.init(SequenceFile.java:264)
at org.apache.hadoop.io.SequenceFile$Reader.(SequenceFile.java:248) at org.apache.hadoop.io.SequenceFile$Reader.(SequenceFile.java:238)
at org.apache.hadoop.mapred.SequenceFileRecordReader.(SequenceFileRecordReader.java:36) at
org.apache.hadoop.mapred.SequenceFileInputFormat.getRecordReader(SequenceFileInputFormat.java:53)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:105) at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:866)
> I haven't had my fingers in that code recently, does it ring any bells for anyone?

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