Benjamin Reed updated ZOOKEEPER-639:

    Attachment: ZOOKEEPER-639.patch

> Performance improvements for ZooKeeper
> --------------------------------------
>                 Key: ZOOKEEPER-639
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-639
>             Project: Zookeeper
>          Issue Type: Improvement
>          Components: server
>            Reporter: Benjamin Reed
>         Attachments: ZOOKEEPER-639.patch
> here are some more improvements to Zab. the patch is a bit stale, but i don't 
> want to lose track of it. there are two big improvements:
> 1) transaction logs are reused. this saves time over growing the log files 
> and if you preallocate a bunch of log files on an empty partition, you will 
> see a nice performance boost
> 2) acks and commits are always sent in order, so if there is a bunch to send, 
> they will get merged into a single ack or commit.

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