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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-9642) Create reader threads pool on demand according to erasure coding policy
Date Tue, 12 Jan 2016 07:11:39 GMT
Kai Zheng created HDFS-9642:
-------------------------------

             Summary: Create reader threads pool on demand according to erasure coding policy
                 Key: HDFS-9642
                 URL: https://issues.apache.org/jira/browse/HDFS-9642
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Kai Zheng
            Assignee: Kai Zheng


While investigating some issue it was noticed in {{DFSClient}}, {{STRIPED_READ_THREAD_POOL}}
will be always created during initialization and by default regardless the used erasure coding
policy it uses the value *18*.

This suggests:
* Create the thread pool on demand only in striping case.
* When create the pool, use a good value respecting the used erasure coding policy.



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