Make DFSClient report bad blocks more quickly
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Key: HDFS-2263
URL: https://issues.apache.org/jira/browse/HDFS-2263
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs client
Affects Versions: 0.20.2
Reporter: Aaron T. Myers
In certain circumstances the DFSClient may detect a block as being bad without
reporting it promptly to the NN.
If when reading a file a client finds an invalid checksum of a block, it
immediately reports that bad block to the NN. If when serving up a block a DN
finds a truncated block, it reports this to the client, but the client merely
adds that DN to the list of dead nodes and moves on to trying another DN,
without reporting this to the NN.
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