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Posted to issues@spark.apache.org by "Davies Liu (JIRA)" <ji...@apache.org> on 2016/04/11 08:36:25 UTC
[jira] [Resolved] (SPARK-13352) BlockFetch does not scale well on
large block
[ https://issues.apache.org/jira/browse/SPARK-13352?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Davies Liu resolved SPARK-13352.
--------------------------------
Resolution: Fixed
Fix Version/s: 2.0.0
1.6.2
> BlockFetch does not scale well on large block
> ---------------------------------------------
>
> Key: SPARK-13352
> URL: https://issues.apache.org/jira/browse/SPARK-13352
> Project: Spark
> Issue Type: Bug
> Components: Block Manager, Spark Core
> Reporter: Davies Liu
> Assignee: Zhang, Liye
> Priority: Critical
> Fix For: 1.6.2, 2.0.0
>
>
> BlockManager.getRemoteBytes() perform poorly on large block
> {code}
> test("block manager") {
> val N = 500 << 20
> val bm = sc.env.blockManager
> val blockId = TaskResultBlockId(0)
> val buffer = ByteBuffer.allocate(N)
> buffer.limit(N)
> bm.putBytes(blockId, buffer, StorageLevel.MEMORY_AND_DISK_SER)
> val result = bm.getRemoteBytes(blockId)
> assert(result.isDefined)
> assert(result.get.limit() === (N))
> }
> {code}
> Here are runtime for different block sizes:
> {code}
> 50M 3 seconds
> 100M 7 seconds
> 250M 33 seconds
> 500M 2 min
> {code}
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