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https://issues.apache.org/jira/browse/SPARK-8571?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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shane knapp resolved SPARK-8571.
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Resolution: Not A Problem
> spark streaming hanging processes upon build exit
> -------------------------------------------------
>
> Key: SPARK-8571
> URL: https://issues.apache.org/jira/browse/SPARK-8571
> Project: Spark
> Issue Type: Bug
> Components: Build, DStreams
> Environment: centos 6.6 amplab build system
> Reporter: shane knapp
> Assignee: shane knapp
> Priority: Minor
> Labels: build, test
>
> over the past 3 months i've been noticing that there are occasionally hanging
> processes on our build system workers after various spark builds have
> finished. these are all spark streaming processes.
> today i noticed a 3+ hour spark build that was timed out after 200 minutes
> (https://amplab.cs.berkeley.edu/jenkins/job/Spark-Master-Maven-pre-YARN/2994/),
> and the matrix build hadoop.version=2.0.0-mr1-cdh4.1.2 ran on
> amp-jenkins-worker-02. after the timeout, it left the following process (and
> all of it's children) hanging.
> the process' CLI command was:
> {quote}
> [root@amp-jenkins-worker-02 ~]# ps auxwww|grep 1714
> jenkins 1714 733 2.7 21342148 3642740 ? Sl 07:52 1713:41 java
> -Dderby.system.durability=test -Djava.awt.headless=true
> -Djava.io.tmpdir=/home/jenkins/workspace/Spark-Master-Maven-pre-YARN/hadoop.version/2.0.0-mr1-cdh4.1.2/label/centos/streaming/target/tmp
> -Dspark.driver.allowMultipleContexts=true
> -Dspark.test.home=/home/jenkins/workspace/Spark-Master-Maven-pre-YARN/hadoop.version/2.0.0-mr1-cdh4.1.2/label/centos
> -Dspark.testing=1 -Dspark.ui.enabled=false
> -Dspark.ui.showConsoleProgress=false
> -Dbasedir=/home/jenkins/workspace/Spark-Master-Maven-pre-YARN/hadoop.version/2.0.0-mr1-cdh4.1.2/label/centos/streaming
> -ea -Xmx3g -XX:MaxPermSize=512m -XX:ReservedCodeCacheSize=512m
> org.scalatest.tools.Runner -R
> /home/jenkins/workspace/Spark-Master-Maven-pre-YARN/hadoop.version/2.0.0-mr1-cdh4.1.2/label/centos/streaming/target/scala-2.10/classes
>
> /home/jenkins/workspace/Spark-Master-Maven-pre-YARN/hadoop.version/2.0.0-mr1-cdh4.1.2/label/centos/streaming/target/scala-2.10/test-classes
> -o -f
> /home/jenkins/workspace/Spark-Master-Maven-pre-YARN/hadoop.version/2.0.0-mr1-cdh4.1.2/label/centos/streaming/target/surefire-reports/SparkTestSuite.txt
> -u
> /home/jenkins/workspace/Spark-Master-Maven-pre-YARN/hadoop.version/2.0.0-mr1-cdh4.1.2/label/centos/streaming/target/surefire-reports/.
> {quote}
> stracing that process doesn't give us much:
> {quote}
> [root@amp-jenkins-worker-02 ~]# strace -p 1714
> Process 1714 attached - interrupt to quit
> futex(0x7ff3cdd269d0, FUTEX_WAIT, 1715, NULL
> {quote}
> stracing it's children gives is a *little* bit more... some loop like this:
> {quote}
> <snip>
> futex(0x7ff3c8012d28, FUTEX_WAKE_PRIVATE, 1) = 0
> futex(0x7ff3c8012f54, FUTEX_WAIT_PRIVATE, 28969, NULL) = 0
> futex(0x7ff3c8012f28, FUTEX_WAKE_PRIVATE, 1) = 0
> futex(0x7ff3c8f17954, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x7ff3c8f17950,
> {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1
> futex(0x7ff3c8f17928, FUTEX_WAKE_PRIVATE, 1) = 1
> futex(0x7ff3c8012d54, FUTEX_WAIT_BITSET_PRIVATE, 1, {2263862, 865233273},
> ffffffff) = -1 ETIMEDOUT (Connection timed out)
> {quote}
> and others loop on prtrace_attach (no such process) or restart_syscall
> (resuming interrupted call)
> even though this behavior has been solidly pinned to jobs timing out (which
> ends w/an aborted, not failed, build), i've seen it happen for failed builds
> as well. if i see any hanging processes from failed (not aborted) builds, i
> will investigate them and update this bug as well.
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