[jira] [Created] (HDFS-7090) Use unbuffered writes when persisting in-memory replicas

[Arpit Agarwal (JIRA)]

Arpit Agarwal created HDFS-7090:
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             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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