Raul Gutierrez Segales created ZOOKEEPER-2098:
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Summary: QuorumCnxManager: use BufferedOutputStream for initial msg
Key: ZOOKEEPER-2098
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2098
Project: ZooKeeper
Issue Type: Improvement
Components: quorum, server
Affects Versions: 3.5.0
Reporter: Raul Gutierrez Segales
Assignee: Raul Gutierrez Segales
Fix For: 3.5.1
Whilst writing fle-dump (a tool like
[zk-dump|https://github.com/twitter/zktraffic/], but to dump FastLeaderElection
messages), I noticed that QCM is using DataOutputStream (which doesn't buffer)
directly.
So all calls to write() are written immediately to the network, which means
simple messaages like two participants exchanging Votes can take a couple RTTs!
This is specially terrible for global clusters (i.e.: x-country RTTs).
The solution is to use BufferedOutputStream for the initial negotiation between
members of the cluster. Note that there are other places were suboptimal (but
not entirely unbuffered) writes to the network still exist. I'll get those in
separate tickets.
After using BufferedOutputStream we get only 1 RTT for the initial message, so
elections & time for for participants to join a cluster is reduced.
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