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From "Fangmin Lv (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ZOOKEEPER-2870) Improve the efficiency of AtomicFileOutputStream
Date Wed, 09 Aug 2017 20:00:00 GMT
Fangmin Lv created ZOOKEEPER-2870:
-------------------------------------

             Summary: Improve the efficiency of AtomicFileOutputStream
                 Key: ZOOKEEPER-2870
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2870
             Project: ZooKeeper
          Issue Type: Improvement
          Components: server
    Affects Versions: 3.5.3, 3.4.10, 3.6.0
            Reporter: Fangmin Lv
            Assignee: Fangmin Lv


The AtomicFileOutputStream extends from FilterOutputStream, where the write function writes
data to underlying stream byte by byte: https://searchcode.com/codesearch/view/17990706/,
which is very inefficient. 

Currently, we only this this class to write the dynamic config, because it's quite small it
won't be a big problem. But in the future we may want to use this class to write the snapshot
file, which will take much longer time, tested inside, writing 600MB snapshot will take more
than 10 minutes, while using FileOutputStream directly only takes 6s.



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