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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2019/04/25 16:57:04 UTC
[jira] [Assigned] (SPARK-27468) "Storage Level" in "RDD Storage
Page" is not correct
[ https://issues.apache.org/jira/browse/SPARK-27468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-27468:
------------------------------------
Assignee: Apache Spark
> "Storage Level" in "RDD Storage Page" is not correct
> ----------------------------------------------------
>
> Key: SPARK-27468
> URL: https://issues.apache.org/jira/browse/SPARK-27468
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.4.1
> Reporter: Shixiong Zhu
> Assignee: Apache Spark
> Priority: Major
> Attachments: Screenshot from 2019-04-17 10-42-55.png
>
>
> I ran the following unit test and checked the UI.
> {code}
> val conf = new SparkConf()
> .setAppName("test")
> .setMaster("local-cluster[2,1,1024]")
> .set("spark.ui.enabled", "true")
> sc = new SparkContext(conf)
> val rdd = sc.makeRDD(1 to 10, 1).persist(StorageLevel.MEMORY_ONLY_2)
> rdd.count()
> Thread.sleep(3600000)
> {code}
> The storage level is "Memory Deserialized 1x Replicated" in the RDD storage page.
> I tried to debug and found this is because Spark emitted the following two events:
> {code}
> event: SparkListenerBlockUpdated(BlockUpdatedInfo(BlockManagerId(1, 10.8.132.160, 65473, None),rdd_0_0,StorageLevel(memory, deserialized, 2 replicas),56,0))
> event: SparkListenerBlockUpdated(BlockUpdatedInfo(BlockManagerId(0, 10.8.132.160, 65474, None),rdd_0_0,StorageLevel(memory, deserialized, 1 replicas),56,0))
> {code}
> The storage level in the second event will overwrite the first one. "1 replicas" comes from this line: https://github.com/apache/spark/blob/3ab96d7acf870e53c9016b0b63d0b328eec23bed/core/src/main/scala/org/apache/spark/storage/BlockManager.scala#L1457
> Maybe AppStatusListener should calculate the replicas from events?
> Another fact we may need to think about is when replicas is 2, will two Spark events arrive in the same order? Currently, two RPCs from different executors can arrive in any order.
> Credit goes to [~srfnmnk] who reported this issue originally.
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