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From "Yoram Arnon (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-159) name node at 100% cpu, making redundant replications
Date Fri, 21 Apr 2006 22:58:05 GMT
name node at 100% cpu, making redundant replications

         Key: HADOOP-159
         URL: http://issues.apache.org/jira/browse/HADOOP-159
     Project: Hadoop
        Type: Bug

  Components: dfs  
    Versions: 0.1.1    
    Reporter: Yoram Arnon
 Assigned to: Sameer Paranjpye 
    Priority: Blocker
     Fix For: 0.2

some hours after adding some new nodes to the cluster, the name node went into a state where
it's consuming 100% cpu.
The log file keeps logging messages of the forms
060421 155049 Obsoleting block blk_8093115169359854355
060421 155049 Pending transfer (block blk_-6965677235456960523) from node1383:50010 to 2 destinations
060421 155049 Block report from node1283:50010: 2140 blocks.
060421 155049 Redundant addStoredBlock request received for block blk_-6836937139917042917
on node node1143:50010

many DFS operations time out, making useful work impossible.

restarting dfs solved the problem for a while, but it came back within an hour.

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