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From "Sean Owen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-4300) Race condition during SparkWorker shutdown
Date Thu, 26 Feb 2015 10:50:04 GMT

    [ https://issues.apache.org/jira/browse/SPARK-4300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14338223#comment-14338223
] 

Sean Owen commented on SPARK-4300:
----------------------------------

Is this specific to shark? I don't imagine so. It seems like the appender has to stop before
the process is destroyed, since the appender can't keep reading its stdout/stderr after it
is destroyed. I'll try a PR.

> Race condition during SparkWorker shutdown
> ------------------------------------------
>
>                 Key: SPARK-4300
>                 URL: https://issues.apache.org/jira/browse/SPARK-4300
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Shell
>    Affects Versions: 1.1.0
>            Reporter: Alex Liu
>            Priority: Minor
>
> When a shark job is done. there are some error message as following show in the log
> {code}
> INFO 22:10:41,635 SparkMaster: akka.tcp://sparkDriver@ip-172-31-11-204.us-west-1.compute.internal:57641
got disassociated, removing it.
>  INFO 22:10:41,640 SparkMaster: Removing app app-20141106221014-0000
>  INFO 22:10:41,687 SparkMaster: Removing application Shark::ip-172-31-11-204.us-west-1.compute.internal
>  INFO 22:10:41,710 SparkWorker: Asked to kill executor app-20141106221014-0000/0
>  INFO 22:10:41,712 SparkWorker: Runner thread for executor app-20141106221014-0000/0
interrupted
>  INFO 22:10:41,714 SparkWorker: Killing process!
> ERROR 22:10:41,738 SparkWorker: Error writing stream to file /var/lib/spark/work/app-20141106221014-0000/0/stdout
> ERROR 22:10:41,739 SparkWorker: java.io.IOException: Stream closed
> ERROR 22:10:41,739 SparkWorker: 	at java.io.BufferedInputStream.getBufIfOpen(BufferedInputStream.java:162)
> ERROR 22:10:41,740 SparkWorker: 	at java.io.BufferedInputStream.read1(BufferedInputStream.java:272)
> ERROR 22:10:41,740 SparkWorker: 	at java.io.BufferedInputStream.read(BufferedInputStream.java:334)
> ERROR 22:10:41,740 SparkWorker: 	at java.io.FilterInputStream.read(FilterInputStream.java:107)
> ERROR 22:10:41,741 SparkWorker: 	at org.apache.spark.util.logging.FileAppender.appendStreamToFile(FileAppender.scala:70)
> ERROR 22:10:41,741 SparkWorker: 	at org.apache.spark.util.logging.FileAppender$$anon$1$$anonfun$run$1.apply$mcV$sp(FileAppender.scala:39)
> ERROR 22:10:41,741 SparkWorker: 	at org.apache.spark.util.logging.FileAppender$$anon$1$$anonfun$run$1.apply(FileAppender.scala:39)
> ERROR 22:10:41,742 SparkWorker: 	at org.apache.spark.util.logging.FileAppender$$anon$1$$anonfun$run$1.apply(FileAppender.scala:39)
> ERROR 22:10:41,742 SparkWorker: 	at org.apache.spark.util.Utils$.logUncaughtExceptions(Utils.scala:1311)
> ERROR 22:10:41,742 SparkWorker: 	at org.apache.spark.util.logging.FileAppender$$anon$1.run(FileAppender.scala:38)
>  INFO 22:10:41,838 SparkMaster: Connected to Cassandra cluster: 4299
>  INFO 22:10:41,839 SparkMaster: Adding host 172.31.11.204 (Analytics)
>  INFO 22:10:41,840 SparkMaster: New Cassandra host /172.31.11.204:9042 added
>  INFO 22:10:41,841 SparkMaster: Adding host 172.31.11.204 (Analytics)
>  INFO 22:10:41,842 SparkMaster: Adding host 172.31.11.204 (Analytics)
>  INFO 22:10:41,852 SparkMaster: akka.tcp://sparkDriver@ip-172-31-11-204.us-west-1.compute.internal:57641
got disassociated, removing it.
>  INFO 22:10:41,853 SparkMaster: akka.tcp://sparkDriver@ip-172-31-11-204.us-west-1.compute.internal:57641
got disassociated, removing it.
>  INFO 22:10:41,853 SparkMaster: akka.tcp://sparkDriver@ip-172-31-11-204.us-west-1.compute.internal:57641
got disassociated, removing it.
>  INFO 22:10:41,857 SparkMaster: akka.tcp://sparkDriver@ip-172-31-11-204.us-west-1.compute.internal:57641
got disassociated, removing it.
>  INFO 22:10:41,862 SparkMaster: Adding host 172.31.11.204 (Analytics)
>  WARN 22:10:42,200 SparkMaster: Got status update for unknown executor app-20141106221014-0000/0
>  INFO 22:10:42,211 SparkWorker: Executor app-20141106221014-0000/0 finished with state
KILLED exitStatus 143
> {code}
> /var/lib/spark/work/app-20141106221014-0000/0/stdout is on the disk. It is trying to
write to a close IO stream. 
> Spark worker shuts down by {code}
>  private def killProcess(message: Option[String]) {
>     var exitCode: Option[Int] = None
>     logInfo("Killing process!")
>     process.destroy()
>     process.waitFor()
>     if (stdoutAppender != null) {
>       stdoutAppender.stop()
>     }
>     if (stderrAppender != null) {
>       stderrAppender.stop()
>     }
>     if (process != null) {
>     exitCode = Some(process.waitFor())
>     }
>     worker ! ExecutorStateChanged(appId, execId, state, message, exitCode)
>  
> {code}
> But stdoutAppender concurrently writes to output log file, which creates race condition.




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