[ https://issues.apache.org/jira/browse/SPARK-664?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Reynold Xin closed SPARK-664. ----------------------------- Resolution: Won't Fix > Accumulator updates should get locally merged before sent to the driver > ----------------------------------------------------------------------- > > Key: SPARK-664 > URL: https://issues.apache.org/jira/browse/SPARK-664 > Project: Spark > Issue Type: Improvement > Components: Spark Core > Reporter: Imran Rashid > Priority: Minor > > Whenever a task finishes, the accumulator updates from that task are > immediately sent back to the driver. When the accumulator updates are big, > this is inefficient because (a) a lot more data has to be sent to the driver > and (b) the driver has to do all the work of merging the updates together. > Probably doesn't matter for small accumulators / low number of tasks, but if > both are big, this could be a big bottleneck. -- 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