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https://issues.apache.org/jira/browse/SPARK-25139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16845422#comment-16845422
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Reza Safi commented on SPARK-25139:
-----------------------------------
Sure, I will send a pr soon. Thanks.
> PythonRunner#WriterThread released block after TaskRunner finally block which
> invoke BlockManager#releaseAllLocksForTask
> -------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-25139
> URL: https://issues.apache.org/jira/browse/SPARK-25139
> Project: Spark
> Issue Type: Bug
> Components: Block Manager
> Affects Versions: 2.3.1
> Reporter: DENG FEI
> Assignee: Xingbo Jiang
> Priority: Major
> Fix For: 2.4.4, 3.0.0
>
>
> We run pyspark streaming on YARN, the executor will die caused by the error:
> the task released lock while finished, but the python writer haven't do real
> releasing lock.
> Normally the task just double check the lock, but it ran wrong in front.
> The executor trace log is below:
> 18/08/17 13:52:20 Executor task launch worker for task 137 DEBUG
> BlockManager: Getting local block input-0-1534485138800 18/08/17 13:52:20
> Executor task launch worker for task 137 TRACE BlockInfoManager: Task 137
> trying to acquire read lock for input-0-1534485138800 18/08/17 13:52:20
> Executor task launch worker for task 137 TRACE BlockInfoManager: Task 137
> acquired read lock for input-0-1534485138800 18/08/17 13:52:20 Executor task
> launch worker for task 137 DEBUG BlockManager: Level for block
> input-0-1534485138800 is StorageLevel(disk, memory, 1 replicas) 18/08/17
> 13:52:20 Executor task launch worker for task 137 INFO BlockManager: Found
> block input-0-1534485138800 locally 18/08/17 13:52:20 Executor task launch
> worker for task 137 INFO PythonRunner: Times: total = 8, boot = 3, init = 5,
> finish = 0 18/08/17 13:52:20 stdout writer for python TRACE BlockInfoManager:
> Task 137 releasing lock for input-0-1534485138800 18/08/17 13:52:20 Executor
> task launch worker for task 137 INFO Executor: 1 block locks were not
> released by TID = 137: [input-0-1534485138800] 18/08/17 13:52:20 stdout
> writer for python ERROR Utils: Uncaught exception in thread stdout writer for
> python java.lang.AssertionError: assertion failed: Block
> input-0-1534485138800 is not locked for reading at
> scala.Predef$.assert(Predef.scala:170) at
> org.apache.spark.storage.BlockInfoManager.unlock(BlockInfoManager.scala:299)
> at org.apache.spark.storage.BlockManager.releaseLock(BlockManager.scala:769)
> at
> org.apache.spark.storage.BlockManager$$anonfun$1.apply$mcV$sp(BlockManager.scala:540)
> at
> org.apache.spark.util.CompletionIterator$$anon$1.completion(CompletionIterator.scala:44)
> at
> org.apache.spark.util.CompletionIterator.hasNext(CompletionIterator.scala:33)
> at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:408) at
> scala.collection.Iterator$class.foreach(Iterator.scala:893) at
> scala.collection.AbstractIterator.foreach(Iterator.scala:1336) at
> org.apache.spark.api.python.PythonRDD$.writeIteratorToStream(PythonRDD.scala:213)
> at
> org.apache.spark.api.python.PythonRunner$$anon$2.writeIteratorToStream(PythonRunner.scala:407)
> at
> org.apache.spark.api.python.BasePythonRunner$WriterThread$$anonfun$run$1.apply(PythonRunner.scala:215)
> at org.apache.spark.util.Utils$.logUncaughtExceptions(Utils.scala:1991) at
> org.apache.spark.api.python.BasePythonRunner$WriterThread.run(PythonRunner.scala:170)
> 18/08/17 13:52:20 stdout writer for python ERROR
> SparkUncaughtExceptionHandler: Uncaught exception in thread Thread[stdout
> writer for python,5,main]
>
> I think shoud wait WriterThread after Task#run.
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