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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-5777) ResolutionMointor dies on an exception
Date Wed, 06 May 2009 00:24:30 GMT
ResolutionMointor dies on an exception

                 Key: HADOOP-5777
                 URL: https://issues.apache.org/jira/browse/HADOOP-5777
             Project: Hadoop Core
          Issue Type: Bug
          Components: dfs
    Affects Versions: 0.18.3
            Reporter: Hairong Kuang

One of our dfs clusters went into an unhealthy state, where many datanodes have non-zero bytes
but no rack information. It turned out the ResolutionMoinitor thread dies on an exception.
Here is the stack trace of the exception that caused the problem:

ERROR org.apache.hadoop.fs.FSNamesystem: java.lang.StringIndexOutOfBoundsException: String
index out of range: -1
        at java.lang.String.substring(String.java:1938)
        at java.lang.String.substring(String.java:1905)
        at org.apache.hadoop.net.NetworkTopology$InnerNode.getNextAncestorName(NetworkTopology.java:119)
        at org.apache.hadoop.net.NetworkTopology$InnerNode.add(NetworkTopology.java:153)
        at org.apache.hadoop.net.NetworkTopology.add(NetworkTopology.java:329)
        at org.apache.hadoop.dfs.FSNamesystem$ResolutionMonitor.run(FSNamesystem.java:1885)
        at java.lang.Thread.run(Thread.java:619)

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