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From "Yuyang Lan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4788) Fix bug in bestNode function which caused 'Could not reach the block' exception even when there're nodes available
Date Thu, 02 May 2013 12:32:15 GMT
Yuyang Lan created HDFS-4788:
--------------------------------

             Summary: Fix bug in bestNode function which caused 'Could not reach the block'
exception even when there're nodes available
                 Key: HDFS-4788
                 URL: https://issues.apache.org/jira/browse/HDFS-4788
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Yuyang Lan


class: org.apache.hadoop.hdfs.server.common.JspHelper
function: bestNode(DatanodeInfo[] nodes, boolean doRandom, Configuration conf)

This function is supposed to return the first (random) health node by performing socket check,
but a bug caused the 'chosenNode' variable is actually only assigned at the 1st time,
So if the first picked node is a dead one, then the socket check will fail 3 times against
it in a row
and finally throw a "Could not reach the block containing the data" IOException,
no matter if other nodes are alive or not.

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