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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-7090) Use unbuffered writes when persisting in-memory replicas
Date Thu, 18 Sep 2014 23:13:35 GMT
Arpit Agarwal created HDFS-7090:
-----------------------------------

             Summary: Use unbuffered writes when persisting in-memory replicas
                 Key: HDFS-7090
                 URL: https://issues.apache.org/jira/browse/HDFS-7090
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: datanode
    Affects Versions: HDFS-6581
            Reporter: Arpit Agarwal


The LazyWriter thread just uses {{FileUtils.copyFile}} to copy block files to persistent storage.
It would be better to use unbuffered writes to avoid churning page cache.



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