RaidNode should fix missing blocks directly on Data Node
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Key: HDFS-1171
URL: https://issues.apache.org/jira/browse/HDFS-1171
Project: Hadoop HDFS
Issue Type: Task
Components: contrib/raid
Affects Versions: 0.20.1
Reporter: Ramkumar Vadali
RaidNode currently does not fix missing blocks. The missing blocks have to be
fixed manually.
This task proposes that recovery be more automated:
1. RaidNode periodically fetches a list of corrupt files from the NameNode
2. If the corrupt files has a RAID parity file, RaidNode identifies missing
block(s) in the file and recomputes the block(s) using the parity file and
other good blocks
3. RaidNode sends the generated block contents to a DataNode
a. RaidNode chooses a DataNode with the most available space to send the
block.
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