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Apache Spark commented on SPARK-12755: -------------------------------------- User 'mallman' has created a pull request for this issue: https://github.com/apache/spark/pull/10700 > Spark may attempt to rebuild application UI before finishing writing the > event logs in possible race condition > -------------------------------------------------------------------------------------------------------------- > > Key: SPARK-12755 > URL: https://issues.apache.org/jira/browse/SPARK-12755 > Project: Spark > Issue Type: Bug > Components: Spark Core > Affects Versions: 1.5.2 > Reporter: Michael Allman > Priority: Minor > > As reported in SPARK-6950, it appears that sometimes the standalone master > attempts to build an application's historical UI before closing the app's > event log. This is still an issue for us in 1.5.2+, and I believe I've found > the underlying cause. > When stopping a {{SparkContext}}, the {{stop}} method stops the DAG scheduler: > https://github.com/apache/spark/blob/a76cf51ed91d99c88f301ec85f3cda1288bcf346/core/src/main/scala/org/apache/spark/SparkContext.scala#L1722-L1727 > and then stops the event logger: > https://github.com/apache/spark/blob/a76cf51ed91d99c88f301ec85f3cda1288bcf346/core/src/main/scala/org/apache/spark/SparkContext.scala#L1722-L1727 > Though it is difficult to follow the chain of events, one of the sequelae of > stopping the DAG scheduler is that the master's {{rebuildSparkUI}} method is > called. This method looks for the application's event logs, and its behavior > varies based on the existence of an {{.inprogress}} file suffix. In > particular, a warning is logged if this suffix exists: > https://github.com/apache/spark/blob/a76cf51ed91d99c88f301ec85f3cda1288bcf346/core/src/main/scala/org/apache/spark/deploy/master/Master.scala#L935 > After calling the {{stop}} method on the DAG scheduler, the {{SparkContext}} > stops the event logger: > https://github.com/apache/spark/blob/a76cf51ed91d99c88f301ec85f3cda1288bcf346/core/src/main/scala/org/apache/spark/SparkContext.scala#L1734-L1736 > This renames the event log, dropping the {{.inprogress}} file sequence. > As such, a race condition exists where the master may attempt to process the > application log file before finalizing it. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org