GitHub user vanzin opened a pull request:
https://github.com/apache/spark/pull/9021
[SPARK-10987] [yarn] Work around for netty rpc disconnection event.
In YARN client mode, when the AM connects to the driver, it may be the case
that the driver never needs to send a message back to the AM (i.e., no
dynamic allocation or preemption). This triggers an issue in the netty rpc
backend where no disconnection event is sent to endpoints, and the AM never
exits after the driver shuts down.
The real fix is too complicated, so this is a quick hack to unblock YARN
client mode until we can work on the real fix. It forces the driver to
send a message to the AM when the AM registers, thus establishing that
connection and enabling the disconnection event when the driver goes
away.
Also, a minor side issue: when the executor is shutting down, it needs
to send an "ack" back to the driver when using the netty rpc backend; but
that "ack" wasn't being sent because the handler was shutting down the rpc
env before returning. So added a change to delay the shutdown a little bit,
allowing the ack to be sent back.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/vanzin/spark SPARK-10987
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/9021.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 #9021
----
commit 8b7620fcfa0a677865dde799ea933e0e7ee266ab
Author: Marcelo Vanzin <[email protected]>
Date: 2015-10-08T00:35:50Z
[SPARK-10987] [yarn] Work around for netty rpc disconnection event.
In YARN client mode, when the AM connects to the driver, it may be the case
that the driver never needs to send a message back to the AM (i.e., no
dynamic allocation or preemption). This triggers an issue in the netty rpc
backend where no disconnection event is sent to endpoints, and the AM never
exits after the driver shuts down.
The real fix is too complicated, so this is a quick hack to unblock YARN
client mode until we can work on the real fix. It forces the driver to
send a message to the AM when the AM registers, thus establishing that
connection and enabling the disconnection event when the driver goes
away.
Also, a minor side issue: when the executor is shutting down, it needs
to send an "ack" back to the driver when using the netty rpc backend; but
that "ack" wasn't being sent because the handler was shutting down the rpc
env before returning. So added a change to delay the shutdown a little bit,
allowing the ack to be sent back.
----
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