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From "Virajith Jalaparti (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-15292) Distcp's use of pread is slowing it down.
Date Tue, 06 Mar 2018 02:27:00 GMT
Virajith Jalaparti created HADOOP-15292:

             Summary: Distcp's use of pread is slowing it down.
                 Key: HADOOP-15292
                 URL: https://issues.apache.org/jira/browse/HADOOP-15292
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Virajith Jalaparti

Distcp currently uses positioned-reads (in RetriableFileCopyCommand#copyBytes) when the source
offset is > 0. This results in unnecessary overheads (new BlockReader being created on
the client-side, multiple readBlock() calls to the Datanodes, each of requires the creation
of a BlockSender and an inputstream to the ReplicaInfo).

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