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Posted to reviews@spark.apache.org by hthuynh2 <gi...@git.apache.org> on 2018/08/02 02:05:01 UTC

[GitHub] spark pull request #21953: [SPARK-24992][Core] spark should randomize yarn l...

GitHub user hthuynh2 opened a pull request:

    https://github.com/apache/spark/pull/21953

    [SPARK-24992][Core] spark should randomize yarn local dir selection

    **Description: [SPARK-24992](https://issues.apache.org/jira/browse/SPARK-24992)**
    Utils.getLocalDir is used to get path of a temporary directory. However, it always returns the the same directory, which is the first element in the array localRootDirs. When running on YARN, this might causes the case that we always write to one disk, which makes it busy while other disks are free. We should randomize the selection to spread out the loads. 
    
    **What changes were proposed in this pull request?**
    This PR randomized the selection of local directory inside the method Utils.getLocalDir. This change affects the Utils.fetchFile method since it based on the fact that Utils.getLocalDir always return the same directory to cache file. Therefore, a new variable cachedLocalDir is used to cache the first localDirectory that it gets from Utils.getLocalDir. Also, when getting the configured local directories (inside Utils. getConfiguredLocalDirs), in case we are in yarn mode, the array of directories are also randomized before return.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/hthuynh2/spark SPARK_24992

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/spark/pull/21953.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 #21953
    
----
commit 3986e75c3c000e7a7e7674be6837d663499f35f1
Author: Hieu Huynh <“h...@...>
Date:   2018-08-01T22:31:48Z

    initial commit

----


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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by jerryshao <gi...@git.apache.org>.
Github user jerryshao commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    I see, thanks for explaining.


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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by hthuynh2 <gi...@git.apache.org>.
Github user hthuynh2 commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    @tgravescs Can you test this please? Thank you.


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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by SparkQA <gi...@git.apache.org>.
Github user SparkQA commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    **[Test build #94050 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/94050/testReport)** for PR 21953 at commit [`a8c1654`](https://github.com/apache/spark/commit/a8c165475edc4dc8b4839aea3035ede380d316dc).
     * This patch **fails Spark unit tests**.
     * This patch merges cleanly.
     * This patch adds no public classes.


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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by tgravescs <gi...@git.apache.org>.
Github user tgravescs commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    We have seen jobs overloading the first disk returned by Yarn.  Unfortunately the details of the job have long expired.  Its in general a good practice to distribute the load anyway.
    
    I remember one of the jobs was python.  I think it was  the case if you look in like EvalPythonExec.scala:
    
          // The queue used to buffer input rows so we can drain it to
          // combine input with output from Python.
          val queue = HybridRowQueue(context.taskMemoryManager(),
            new File(Utils.getLocalDir(SparkEnv.get.conf)), child.output.length)
    
    That is always going to hit the disk yarn returns first for every container on that node.


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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by tgravescs <gi...@git.apache.org>.
Github user tgravescs commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    test this please


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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by SparkQA <gi...@git.apache.org>.
Github user SparkQA commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    **[Test build #94136 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/94136/testReport)** for PR 21953 at commit [`a8c1654`](https://github.com/apache/spark/commit/a8c165475edc4dc8b4839aea3035ede380d316dc).


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Posted by AmplabJenkins <gi...@git.apache.org>.
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    https://github.com/apache/spark/pull/21953
  
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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by tgravescs <gi...@git.apache.org>.
Github user tgravescs commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    wow each of these test failures is different.  trying again


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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by SparkQA <gi...@git.apache.org>.
Github user SparkQA commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    **[Test build #94016 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/94016/testReport)** for PR 21953 at commit [`3986e75`](https://github.com/apache/spark/commit/3986e75c3c000e7a7e7674be6837d663499f35f1).
     * This patch **fails Spark unit tests**.
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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by AmplabJenkins <gi...@git.apache.org>.
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    https://github.com/apache/spark/pull/21953
  
    Can one of the admins verify this patch?


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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

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    https://github.com/apache/spark/pull/21953
  
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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by tgravescs <gi...@git.apache.org>.
Github user tgravescs commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    +1 pending jenkins. 


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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

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    https://github.com/apache/spark/pull/21953
  
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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

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    https://github.com/apache/spark/pull/21953
  
    **[Test build #94085 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/94085/testReport)** for PR 21953 at commit [`a8c1654`](https://github.com/apache/spark/commit/a8c165475edc4dc8b4839aea3035ede380d316dc).
     * This patch **fails Spark unit tests**.
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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by SparkQA <gi...@git.apache.org>.
Github user SparkQA commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    **[Test build #94136 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/94136/testReport)** for PR 21953 at commit [`a8c1654`](https://github.com/apache/spark/commit/a8c165475edc4dc8b4839aea3035ede380d316dc).
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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by tgravescs <gi...@git.apache.org>.
Github user tgravescs commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    Jenkins, test this please


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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by jerryshao <gi...@git.apache.org>.
Github user jerryshao commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    What kind of behavior did you see? This local dir is only used to store some temporary files, which is not IO intensive, so I don't think the problem here is severe.


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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by tgravescs <gi...@git.apache.org>.
Github user tgravescs commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    test this please
    



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    https://github.com/apache/spark/pull/21953
  
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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by tgravescs <gi...@git.apache.org>.
Github user tgravescs commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    Jenkins, test this please


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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

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    https://github.com/apache/spark/pull/21953
  
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     * This patch **fails due to an unknown error code, -9**.
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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by tgravescs <gi...@git.apache.org>.
Github user tgravescs commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    looks like random test timeout error.


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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by SparkQA <gi...@git.apache.org>.
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    https://github.com/apache/spark/pull/21953
  
    **[Test build #94287 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/94287/testReport)** for PR 21953 at commit [`a8c1654`](https://github.com/apache/spark/commit/a8c165475edc4dc8b4839aea3035ede380d316dc).
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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by tgravescs <gi...@git.apache.org>.
Github user tgravescs commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    Jenkins, test this please


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[GitHub] spark pull request #21953: [SPARK-24992][Core] spark should randomize yarn l...

Posted by tgravescs <gi...@git.apache.org>.
Github user tgravescs commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21953#discussion_r207258035
  
    --- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
    @@ -460,7 +461,14 @@ private[spark] object Utils extends Logging {
         if (useCache && fetchCacheEnabled) {
           val cachedFileName = s"${url.hashCode}${timestamp}_cache"
           val lockFileName = s"${url.hashCode}${timestamp}_lock"
    -      val localDir = new File(getLocalDir(conf))
    +      var localDir: File = null
    +      // Set the cachedLocalDir for the first time and re-use it later
    +      this.synchronized {
    --- End diff --
    
    if we want to be more efficient to not hit the synchronized block each time we could do one extra check before it to check cachedLocalDir.isEmpty.   Only if its empty do we enter synchronized and then recheck if still empty.  
    
    this would be very similar to getOrCreateLocalRootDirs


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[GitHub] spark pull request #21953: [SPARK-24992][Core] spark should randomize yarn l...

Posted by asfgit <gi...@git.apache.org>.
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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by tgravescs <gi...@git.apache.org>.
Github user tgravescs commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    merged to master, thanks @hthuynh2 


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Posted by jerryshao <gi...@git.apache.org>.
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    https://github.com/apache/spark/pull/21953
  
    Jenkins, retest this please.


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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by AmplabJenkins <gi...@git.apache.org>.
Github user AmplabJenkins commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    Test FAILed.
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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by holdensmagicalunicorn <gi...@git.apache.org>.
Github user holdensmagicalunicorn commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    @hthuynh2, thanks! I am a bot who has found some folks who might be able to help with the review:@li-zhihui, @mateiz and @pwendell


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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by hthuynh2 <gi...@git.apache.org>.
Github user hthuynh2 commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    @tgravescs I updated it. Thanks.


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[GitHub] spark issue #21953: [SPARK-24992][Core] spark should randomize yarn local di...

Posted by AmplabJenkins <gi...@git.apache.org>.
Github user AmplabJenkins commented on the issue:

    https://github.com/apache/spark/pull/21953
  
    Test FAILed.
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    Test FAILed.


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