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https://issues.apache.org/jira/browse/SPARK-27614?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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feiwang updated SPARK-27614:
----------------------------
Comment: was deleted
(was: You can propose a PR to spark. It seems meaningful.)
> Executor shuffle fetch hang
> ---------------------------
>
> Key: SPARK-27614
> URL: https://issues.apache.org/jira/browse/SPARK-27614
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.1.1, 2.4.0
> Reporter: weDataSphere
> Priority: Major
>
> Most of the Tasks have been completed, and individual Tasks have a
> particularly long Duration and are not being processed at all
>
> The corresponding Executor has a connection timeout, and the stack
> information shows hang in the method of ShuffleBlockFetcherIterator.next.
>
> The corresponding code is as follows：
> {code}
> while (!isZombie && result == null) {
> val startFetchWait = System.nanoTime()
> result = results.take()
> val fetchWaitTime = TimeUnit.NANOSECONDS.toMillis(System.nanoTime() -
> startFetchWait)
> shuffleMetrics.incFetchWaitTime(fetchWaitTime)
> {code}
>
>
> LinkedBlockingQueue's take method is blocked. We can use poll instead. The
> modified code is as follows：
> {code}
> currentResult =
> if(!this.blockManager.conf.getBoolean("spark.shuffle.fetch.timeout.enable",
> true)) results.take()
> else {
> logInfo("set spark.shuffle.fetch.timeout.enable=true.")
> val GB = 1L << 30
> val MB = 1L << 20
> val (waitTime, unit) = if(bytesInFlight >= 2 * GB) (2, TimeUnit.HOURS)
> else if(bytesInFlight >= GB) (1, TimeUnit.HOURS)
> else if(bytesInFlight >= 512*MB) (45, TimeUnit.MINUTES)
> else if(bytesInFlight >= 200*MB) (30, TimeUnit.MINUTES)
> else if(bytesInFlight >= 100*MB) (20, TimeUnit.MINUTES)
> else if(bytesInFlight >= 10*MB) (15, TimeUnit.MINUTES)
> else (10, TimeUnit.MINUTES)
> val r = results.poll(waitTime, unit)
> if(r == null) {
> val cost = "cost " + waitTime + unit.toString + " to wait for a
> shuffle block, give up!"
> logError(cost)
> throw new SparkException(cost)
> {code}
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