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From: HyukjinKwon <git@git.apache.org>
To: reviews@spark.apache.org
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References: <git-pr-18320-spark@git.apache.org>
In-Reply-To: <git-pr-18320-spark@git.apache.org>
Subject: [GitHub] spark issue #18320: [SPARK-21093][R] Terminate R's worker processes in the p...
Content-Type: text/plain
Message-Id: <20170622082913.9834FDFA29@git1-us-west.apache.org>
Date: Thu, 22 Jun 2017 08:29:13 +0000 (UTC)
archived-at: Thu, 22 Jun 2017 08:29:15 -0000

Github user HyukjinKwon commented on the issue:

    https://github.com/apache/spark/pull/18320
  
    **jobs with many stages**:
    
    I tested the codes below:
    
    ```R
    ```r
    df <- createDataFrame(list(list(1L, 1, "1", 0.1)), c("a", "b", "c", "d"))
    for(i in 0:90) {
      df <- (gapply(df, "a", function(key, x) { x }, schema(df)))
    }
    collect(df)
    ```
    
    More iteration produced `StackOverflowError` in my local and CentOS. This created 18201 tasks with 92 stages.
    
    **jobs with long stages**:
    
    I made the change as below:
    
    ```r
    df <- createDataFrame(list(list(1L, 1, "1", 0.1)), c("a", "b", "c", "d"))
    collect(dapply(repartition(df, 8), function(x) { x }, schema(df)))
    ```
    
    after manual changes as below:
    
    ```r
     outputCon <- socketConnection(
         port = port, blocking = TRUE, open = "wb", timeout = connectionTimeout)
    
    +Sys.sleep(600L)
    +
     # read the index of the current partition inside the RDD
     partition <- SparkR:::readInt(inputCon)
    ```
    
    This took 10 mins (default cores in executors was 8). 
    
    
    It looks both were fine. Would this address your concern enough @felixcheung?


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