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From "shane knapp (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SPARK-8571) spark streaming hanging processes upon build exit
Date Tue, 10 Apr 2018 18:24:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-8571?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

shane knapp resolved SPARK-8571.
--------------------------------
    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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