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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2020/09/15 17:40:59 UTC

[GitHub] [spark] wzhfy opened a new pull request #29764: [SPARK-32738][CORE][2.4] Should reduce the number of active threads if fatal error happens in `Inbox.process`

wzhfy opened a new pull request #29764:
URL: https://github.com/apache/spark/pull/29764


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   This is a backport for [pr#29580](https://github.com/apache/spark/pull/29580) to branch 2.4.
   
   ### What changes were proposed in this pull request?
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   Processing for `ThreadSafeRpcEndpoint` is controlled by  `numActiveThreads` in `Inbox`. Now if any fatal error happens during `Inbox.process`, `numActiveThreads` is not reduced. Then other threads can not process messages in that inbox, which causes the endpoint to "hang". For other type of endpoints, we also should keep  `numActiveThreads` correct.
   
   This problem is more serious in previous Spark 2.x versions since the driver, executor and block manager endpoints are all thread safe endpoints.
   
   To fix this, we should reduce the number of active threads if fatal error happens in `Inbox.process`.
   
   ### Why are the changes needed?
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     1. If you propose a new API, clarify the use case for a new API.
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   `numActiveThreads` is not correct when fatal error happens and will cause the described problem.
   
   ### Does this PR introduce _any_ user-facing change?
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   No.
   
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   Add a new test.


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[GitHub] [spark] wzhfy commented on pull request #29764: [SPARK-32738][CORE][2.4] Should reduce the number of active threads if fatal error happens in `Inbox.process`

Posted by GitBox <gi...@apache.org>.
wzhfy commented on pull request #29764:
URL: https://github.com/apache/spark/pull/29764#issuecomment-694643818


   Finally all tests are passed..
   cc @cloud-fan @mridulm  This is a backport for branch 2.4.


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[GitHub] [spark] wzhfy edited a comment on pull request #29764: [SPARK-32738][CORE][2.4] Should reduce the number of active threads if fatal error happens in `Inbox.process`

Posted by GitBox <gi...@apache.org>.
wzhfy edited a comment on pull request #29764:
URL: https://github.com/apache/spark/pull/29764#issuecomment-694643818


   Finally all tests are passed...
   cc @cloud-fan @mridulm  This is a backport for branch 2.4.


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[GitHub] [spark] wzhfy closed pull request #29764: [SPARK-32738][CORE][2.4] Should reduce the number of active threads if fatal error happens in `Inbox.process`

Posted by GitBox <gi...@apache.org>.
wzhfy closed pull request #29764:
URL: https://github.com/apache/spark/pull/29764


   


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URL: https://github.com/apache/spark/pull/29764#issuecomment-692872869


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[GitHub] [spark] wzhfy commented on pull request #29764: [SPARK-32738][CORE][2.4] Should reduce the number of active threads if fatal error happens in `Inbox.process`

Posted by GitBox <gi...@apache.org>.
wzhfy commented on pull request #29764:
URL: https://github.com/apache/spark/pull/29764#issuecomment-693779495


   retest this please


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Posted by GitBox <gi...@apache.org>.
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URL: https://github.com/apache/spark/pull/29764#issuecomment-693781543


   **[Test build #128791 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/128791/testReport)** for PR 29764 at commit [`af64be8`](https://github.com/apache/spark/commit/af64be83dd3b07b148d8c1886633729d6d06eec5).
    * This patch **fails build dependency tests**.
    * This patch merges cleanly.
    * This patch adds no public classes.


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[GitHub] [spark] wzhfy commented on a change in pull request #29764: [SPARK-32738][CORE][2.4] Should reduce the number of active threads if fatal error happens in `Inbox.process`

Posted by GitBox <gi...@apache.org>.
wzhfy commented on a change in pull request #29764:
URL: https://github.com/apache/spark/pull/29764#discussion_r488850811



##########
File path: core/src/test/scala/org/apache/spark/rpc/netty/InboxSuite.scala
##########
@@ -147,4 +147,18 @@ class InboxSuite extends SparkFunSuite {
 
     endpoint.verifySingleOnNetworkErrorMessage(cause, remoteAddress)
   }
+
+  test("SPARK-32738: should reduce the number of active threads when fatal error happens") {
+    val endpoint = mock(classOf[TestRpcEndpoint])
+    when(endpoint.receive).thenThrow(new OutOfMemoryError())
+
+    val endpointRef = mock(classOf[NettyRpcEndpointRef])
+    val dispatcher = mock(classOf[Dispatcher])
+    val inbox = new Inbox(endpointRef, endpoint)

Review comment:
       Here in 2.4 we pass an `endpointRef` as parameter instead of a `name` in 3.x




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[GitHub] [spark] wzhfy commented on pull request #29764: [SPARK-32738][CORE][2.4] Should reduce the number of active threads if fatal error happens in `Inbox.process`

Posted by GitBox <gi...@apache.org>.
wzhfy commented on pull request #29764:
URL: https://github.com/apache/spark/pull/29764#issuecomment-693098405


   retest this please


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[GitHub] [spark] wzhfy commented on pull request #29764: [SPARK-32738][CORE][2.4] Should reduce the number of active threads if fatal error happens in `Inbox.process`

Posted by GitBox <gi...@apache.org>.
wzhfy commented on pull request #29764:
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   retest this please


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[GitHub] [spark] mridulm commented on pull request #29764: [SPARK-32738][CORE][2.4] Should reduce the number of active threads if fatal error happens in `Inbox.process`

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   @wzhfy Can you close the PR please ? It has been merged to branch-2.4


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[GitHub] [spark] SparkQA commented on pull request #29764: [SPARK-32738][CORE][2.4] Should reduce the number of active threads if fatal error happens in `Inbox.process`

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   **[Test build #128728 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/128728/testReport)** for PR 29764 at commit [`af64be8`](https://github.com/apache/spark/commit/af64be83dd3b07b148d8c1886633729d6d06eec5).
    * This patch **fails Spark unit tests**.
    * This patch merges cleanly.
    * This patch adds no public classes.


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[GitHub] [spark] wzhfy commented on pull request #29764: [SPARK-32738][CORE][2.4] Should reduce the number of active threads if fatal error happens in `Inbox.process`

Posted by GitBox <gi...@apache.org>.
wzhfy commented on pull request #29764:
URL: https://github.com/apache/spark/pull/29764#issuecomment-695145607


   @mridulm Closed. Thanks!


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