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Date: Wed, 23 Mar 2011 14:44:05 +0000 (UTC)
From: "Uma Maheswara Rao G (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Created] (HDFS-1779) After NameNode restart , Clients can
 not read partial files even after client invokes Sync.
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After NameNode restart , Clients can not read partial files even after client invokes Sync.
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                 Key: HDFS-1779
                 URL: https://issues.apache.org/jira/browse/HDFS-1779
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: data-node, name-node
    Affects Versions: 0.20-append
         Environment: Linux
            Reporter: Uma Maheswara Rao G


In Append HDFS-200 issue,
If file has 10 blocks and after writing 5 blocks if client invokes sync method then NN will persist the blocks information in edits. 
After this if we restart the NN, All the DataNodes will reregister with NN. But DataNodes are not sending the blocks being written information to NN. DNs are sending the blocksBeingWritten information in DN startup. So, here NameNode can not find that the 5 persisted blocks belongs to which datanodes. This information can build based on block reports from DN. Otherwise we will loose this 5 blocks information even NN persisted that block information in edits. 


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