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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8760) Erasure Coding: reuse BlockReader when reading the same block in pread
Date Fri, 10 Jul 2015 23:56:04 GMT
Jing Zhao created HDFS-8760:
-------------------------------

             Summary: Erasure Coding: reuse BlockReader when reading the same block in pread
                 Key: HDFS-8760
                 URL: https://issues.apache.org/jira/browse/HDFS-8760
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Jing Zhao
            Assignee: Jing Zhao


Currently in pread, we create a new block reader for each aligned stripe even though these
stripes belong to the same block. It's better to reuse them to avoid unnecessary block reader
creation overhead. This can also avoid reading from the same bad DataNode.



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