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Posted to hdfs-dev@hadoop.apache.org by "Kai Zheng (JIRA)" <ji...@apache.org> on 2016/01/12 08:11:39 UTC

[jira] [Created] (HDFS-9642) Create reader threads pool on demand according to erasure coding policy

Kai Zheng created HDFS-9642:
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             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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