Mahadev konar commented on ZOOKEEPER-308:

this is great!!! 
comments/questions on the patch -- 

- what is the usefulness of the change in FileTxnLog, the flush has been moved 
earlier i.e while flushing when rolling the logs. Is their some specific reason 
for it?
- looks the outstanding changes on gives us a sorted order of zxid.... is it 
possible to get rid of outstandingchanges assuming that if zxid is the first in 
the outstandingchanges queue then zxid +1 will be the next one? I dont have a 
strong opinion on it. Anyway the outstanding list should not use that much 
- what is the purpose of writePacket(*, boolean) in follower.java. Why do we 
need to an option on when to flush ?
- why is tcpNodelay an option? why is not it always set to true?
- leader.java (line 560) needs wrapping
- why is the Excpetion wrapped around to IOExcpetion in SerializeUtils.java? 
All the lines in the deserializeSnapshot can only throw IOExcpeiton? Why do we 
have to wrap around Exception?

> improve the atomic broadcast performance 3x
> -------------------------------------------
>                 Key: ZOOKEEPER-308
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-308
>             Project: Zookeeper
>          Issue Type: Improvement
>          Components: server
>            Reporter: Benjamin Reed
>         Attachments: dat.png, ZOOKEEPER-308.patch, ZOOKEEPER-308.patch
> We need a benchmark for zab, the atomic broadcast protocol of zookeeper. we 
> can also do some small tweaks to make zab go much faster.

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