[jira] [Assigned] (SPARK-20691) Difference between Storage Memory as seen internally and in web UI

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-20691?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-20691:
------------------------------------

    Assignee:     (was: Apache Spark)

> Difference between Storage Memory as seen internally and in web UI
> ------------------------------------------------------------------
>
>                 Key: SPARK-20691
>                 URL: https://issues.apache.org/jira/browse/SPARK-20691
>             Project: Spark
>          Issue Type: Bug
>          Components: Web UI
>    Affects Versions: 2.3.0
>            Reporter: Jacek Laskowski
>              Labels: starter
>
> I set Major priority as it's visible to a user.
> There's a difference in what the size of Storage Memory is managed internally and displayed to a user in web UI.
> I found it while answering [How does web UI calculate Storage Memory (in Executors tab)?|http://stackoverflow.com/q/43801062/1305344] on StackOverflow.
> In short (quoting the main parts), when you start a Spark app (say spark-shell) you see 912.3 MB RAM for Storage Memory:
> {code}
> $ ./bin/spark-shell --conf spark.driver.memory=2g
> ...
> 17/05/07 15:20:50 INFO BlockManagerMasterEndpoint: Registering block manager 192.168.1.8:57177 with 912.3 MB RAM, BlockManagerId(driver, 192.168.1.8, 57177, None)
> {code}
> but in the web UI you'll see 956.6 MB due to the way the custom JavaScript function {{formatBytes}} in [utils.js|https://github.com/apache/spark/blob/master/core/src/main/resources/org/apache/spark/ui/static/utils.js#L40-L48] calculates the value. That translates to the following Scala code:
> {code}
> def formatBytes(bytes: Double) = {
>   val k = 1000
>   val i = math.floor(math.log(bytes) / math.log(k))
>   val maxMemoryWebUI = bytes / math.pow(k, i)
>   f"$maxMemoryWebUI%1.1f"
> }
> scala> println(formatBytes(maxMemory))
> 956.6
> {code}



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