Todd Lipcon created HDFS-3429:
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Summary: DataNode reads checksums even if client does not need them
Key: HDFS-3429
URL: https://issues.apache.org/jira/browse/HDFS-3429
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node, performance
Affects Versions: 2.0.0
Reporter: Todd Lipcon
Currently, even if the client does not want to verify checksums, the datanode
reads them anyway and sends them over the wire. This means that performance
improvements like HBase's application-level checksums don't have much benefit
when reading through the datanode, since the DN is still causing seeks into the
checksum file.
(Credit goes to Dhruba for discovering this - filing on his behalf)
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