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Posted to hdfs-dev@hadoop.apache.org by "Hairong Kuang (JIRA)" <ji...@apache.org> on 2009/07/29 19:06:14 UTC

[jira] Created: (HDFS-512) Set block id as the key to Block

Set block id as the key to Block
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                 Key: HDFS-512
                 URL: https://issues.apache.org/jira/browse/HDFS-512
             Project: Hadoop HDFS
          Issue Type: Improvement
    Affects Versions: 0.21.0
            Reporter: Hairong Kuang
            Assignee: Hairong Kuang
             Fix For: 0.21.0


Currently the key to Block is block id + generation stamp. I would propose to change it to be only block id. This is based on the following properties of the dfs cluster:
1. On each datanode only one replica of block exists. Therefore there is only one generation of a block.
2. NameNode has only one entry for a block in its blocks map.

With this change, search for a block/replica's meta information is easier since most of the time we know a block's id but may not know its generation stamp.

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