GitHub user jiangxb1987 opened a pull request:
https://github.com/apache/spark/pull/18096
[SPARK-18406][CORE][Backport-2.0] Race between end-of-task and completion
iterator read lock release
This is a backport PR to 2.0 and 2.1.
## What changes were proposed in this pull request?
When a TaskContext is not propagated properly to all child threads for the
task, just like the reported cases in this issue, we fail to get to TID from
TaskContext and that causes unable to release the lock and assertion failures.
To resolve this, we have to explicitly pass the TID value to the `unlock`
method.
## How was this patch tested?
Add new failing regression test case in `RDDSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jiangxb1987/spark completion-iterator-2.0
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18096.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 #18096
----
commit c85afb2c5e12abc7c0d7abde315f16ed54b48f7e
Author: Xingbo Jiang <xingbo.ji...@databricks.com>
Date: 2017-05-24T07:43:23Z
[SPARK-18406][CORE] Race between end-of-task and completion iterator read
lock release
When a TaskContext is not propagated properly to all child threads for the
task, just like the reported cases in this issue, we fail to get to TID from
TaskContext and that causes unable to release the lock and assertion failures.
To resolve this, we have to explicitly pass the TID value to the `unlock`
method.
Add new failing regression test case in `RDDSuite`.
Author: Xingbo Jiang <xingbo.ji...@databricks.com>
Closes #18076 from jiangxb1987/completion-iterator.
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