GitHub user vanzin opened a pull request:
https://github.com/apache/spark/pull/9917
[SPARK-11866] [network] [core] Make sure timed out RPCs are cleaned up.
This change does a couple of different things to make sure that the
RpcEnv-level
code and the network library agree about the status of outstanding RPCs.
For RPCs that do not expect a reply ("RpcEnv.send"), support for one way
messages (hello CORBA!) was added to the network layer. This is a
"fire and forget" message that does not require any state to be kept
by the TransportClient; as a result, the RpcEnv 'Ack' message is not needed
anymore.
For RPCs that do expect a reply ("RpcEnv.ask"), the network library now
returns the internal RPC id; if the RpcEnv layer decides to time out the
RPC before the network layer does, it now asks the TransportClient to
forget about the RPC, so that if the network-level timeout occurs, the
client is not killed.
As part of implementing the above, I cleaned up some of the code in the
netty rpc backend, removing types that were not necessary and factoring
out some common code. Of interest is a slight change in the exceptions
when posting messages to a stopped RpcEnv; that's mostly to avoid nasty
error messages from the local-cluster backend when shutting down, which
pollutes the terminal output.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/vanzin/spark SPARK-11866
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/9917.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 #9917
----
commit b00f4f0b118d68c913d64cff68c2db05e1d1e3e5
Author: Marcelo Vanzin <[email protected]>
Date: 2015-11-20T20:42:12Z
[SPARK-11866] [network] [core] Make sure timed out RPCs are cleaned up.
This change does a couple of different things to make sure that the
RpcEnv-level
code and the network library agree about the status of outstanding RPCs.
For RPCs that do not expect a reply ("RpcEnv.send"), support for one way
messages (hello CORBA!) was added to the network layer. This is a
"fire and forget" message that does not require any state to be kept
by the TransportClient; as a result, the RpcEnv 'Ack' message is not needed
anymore.
For RPCs that do expect a reply ("RpcEnv.ask"), the network library now
returns the internal RPC id; if the RpcEnv layer decides to time out the
RPC before the network layer does, it now asks the TransportClient to
forget about the RPC, so that if the network-level timeout occurs, the
client is not killed.
As part of implementing the above, I cleaned up some of the code in the
netty rpc backend, removing types that were not necessary and factoring
out some common code. Of interest is a slight change in the exceptions
when posting messages to a stopped RpcEnv; that's mostly to avoid nasty
error messages from the local-cluster backend when shutting down, which
pollutes the terminal output.
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