GitHub user zsxwing opened a pull request:
https://github.com/apache/spark/pull/9197
[SPARK-11098][Core]Add Outbox to cache the sending messages to resolve the
message disorder issue
The current NettyRpc has a message order issue because it uses a thread
pool to send messages. E.g., running the following two lines in the same thread,
```
ref.send("A")
ref.send("B")
```
The remote endpoint may see "B" before "A" because sending "A" and "B" are
in parallel.
To resolve this issue, this PR added an outbox for each connection, and if
we are connecting to the remote node when sending messages, just cache the
sending messages in the outbox and send them one by one when the connection is
established.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zsxwing/spark rpc-outbox
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/9197.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #9197
----
commit 295f92a84d447ed8f0c8e5cbb38379f9f76f0888
Author: zsxwing <[email protected]>
Date: 2015-10-20T08:18:11Z
Add Outbox to cache the sending messages to resolve the message disorder
issue
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