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From "Shivaram Venkataraman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-2316) StorageStatusListener should avoid O(blocks) operations
Date Fri, 25 Jul 2014 18:03:41 GMT

    [ https://issues.apache.org/jira/browse/SPARK-2316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14074692#comment-14074692
] 

Shivaram Venkataraman commented on SPARK-2316:
----------------------------------------------

On a related note, can we have flags to turn off some of the UI listeners ? If the StorageTab
is going to be too expensive to update, it'll be good to have a way to turn it off and just
have the JobProgress show up in the UI

> StorageStatusListener should avoid O(blocks) operations
> -------------------------------------------------------
>
>                 Key: SPARK-2316
>                 URL: https://issues.apache.org/jira/browse/SPARK-2316
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core, Web UI
>    Affects Versions: 1.0.0
>            Reporter: Patrick Wendell
>            Assignee: Andrew Or
>            Priority: Critical
>
> In the case where jobs are frequently causing dropped blocks the storage status listener
can bottleneck. This is slow for a few reasons, one being that we use Scala collection operations,
the other being that we operations that are O(number of blocks). I think using a few indices
here could make this much faster.
> {code}
>  at java.lang.Integer.valueOf(Integer.java:642)
>         at scala.runtime.BoxesRunTime.boxToInteger(BoxesRunTime.java:70)
>         at org.apache.spark.storage.StorageUtils$$anonfun$9.apply(StorageUtils.scala:82)
>         at scala.collection.TraversableLike$$anonfun$groupBy$1.apply(TraversableLike.scala:328)
>         at scala.collection.TraversableLike$$anonfun$groupBy$1.apply(TraversableLike.scala:327)
>         at scala.collection.immutable.HashMap$HashMap1.foreach(HashMap.scala:224)
>         at scala.collection.immutable.HashMap$HashTrieMap.foreach(HashMap.scala:403)
>         at scala.collection.immutable.HashMap$HashTrieMap.foreach(HashMap.scala:403)
>         at scala.collection.immutable.HashMap$HashTrieMap.foreach(HashMap.scala:403)
>         at scala.collection.TraversableLike$class.groupBy(TraversableLike.scala:327)
>         at scala.collection.AbstractTraversable.groupBy(Traversable.scala:105)
>         at org.apache.spark.storage.StorageUtils$.rddInfoFromStorageStatus(StorageUtils.scala:82)
>         at org.apache.spark.ui.storage.StorageListener.updateRDDInfo(StorageTab.scala:56)
>         at org.apache.spark.ui.storage.StorageListener.onTaskEnd(StorageTab.scala:67)
>         - locked <0x00000000a27ebe30> (a org.apache.spark.ui.storage.StorageListener)
> {code}



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