[ http://issues.apache.org/jira/browse/HADOOP-677?page=all ]
Owen O'Malley updated HADOOP-677:
---------------------------------
Attachment: rpc-header.patch
This patch causes the server to ignore a header on the start of ipc/rpc
connections that look like:
"hrpc" <version byte>
The client has a static boolean variable about whether it should send such
headers and it is currently set to false.
My plan is to have:
0.9: permissive server, old client
0.10: permissive server, new client
0.11: strict server, new client
If the hdfs protocol changes before 0.11, we can move to strict servers sooner.
*smile*
> RPC should send a fixed header and version at the start of connection
> ---------------------------------------------------------------------
>
> Key: HADOOP-677
> URL: http://issues.apache.org/jira/browse/HADOOP-677
> Project: Hadoop
> Issue Type: Improvement
> Components: ipc
> Affects Versions: 0.7.2
> Reporter: Owen O'Malley
> Assigned To: Owen O'Malley
> Fix For: 0.9.0
>
> Attachments: rpc-header.patch
>
>
> There have been problems with http clients connecting to the RPC servers,
> which causes the RPC to try and allocate huge buffers and get
> OutOfMemoryExceptions. I want to have a fixed prefix that is sent first that
> identifies it as an RPC client. To make the system compatible as much as
> possible, I'd make the servers accept both forms for a Hadoop release and
> then change the clients to send the prefix, and finally make the servers only
> accept the new form.
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