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