Hudson commented on ZOOKEEPER-2870:

FAILURE: Integrated in Jenkins build ZooKeeper-trunk #3493 (See 
ZOOKEEPER-2870: Improve the efficiency of AtomicFileOutputStream (hanm: rev 
* (edit) src/java/main/org/apache/zookeeper/common/AtomicFileOutputStream.java

> 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: 3.4.10, 3.5.3, 3.6.0
>            Reporter: Fangmin Lv
>            Assignee: Fangmin Lv
>             Fix For: 3.5.4, 3.6.0, 3.4.11
> 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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