[jira] Created: (HDFS-978) Record every new block allocation of a file into the transaction log.

[dhruba borthakur (JIRA)]

Record every new block allocation of a file into the transaction log.
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                 Key: HDFS-978
                 URL: https://issues.apache.org/jira/browse/HDFS-978
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: name-node
            Reporter: dhruba borthakur


HDFS should record every new block allocation (of a file) into its transaction 
logs. In the current code, block allocations are persisted only when a file is 
closed or hflush-ed. This feature will enable HDFS writers to survive namenode 
restarts.

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