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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