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Posted to hdfs-dev@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2012/05/16 08:12:16 UTC

[jira] [Created] (HDFS-3429) DataNode reads checksums even if client does not need them

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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