GitHub user zsxwing opened a pull request:
https://github.com/apache/spark/pull/10514
[SPARK-12511][PySpark][Streaming]Make sure TransformFunctionSerializer is
created only once
Although SPARK-12511 is because of an issue in Py4j that
PythonProxyHandler.finalize blocks forever, we can bypass it.
When checkpoint is enabled, right now `Streaming._ensure_initialized` will
be called twice and create two `TransformFunctionSerializer`s. Because the
first `TransformFunctionSerializer` is replaced and GCed,
`PythonProxyHandler.finalize` will be triggered. Actually, we only need one
`TransformFunctionSerializer`.
This PR added a simple check to avoid creating TransformFunctionSerializer
multiple times, then `PythonProxyHandler.finalize` won't be called since
TransformFunctionSerializer will always be used.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zsxwing/spark SPARK-12511
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/10514.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 #10514
----
commit 9be0d0a01edbb6615871c84f6d8f4b608501a8f0
Author: Shixiong Zhu <[email protected]>
Date: 2015-12-29T23:14:16Z
Make sure TransformFunctionSerializer is created only once
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