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Posted to issues@spark.apache.org by "Zhan Zhang (JIRA)" <ji...@apache.org> on 2017/03/17 20:25:42 UTC
[jira] [Updated] (SPARK-20006) Separate threshold for broadcast and
shuffled hash join
[ https://issues.apache.org/jira/browse/SPARK-20006?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Zhan Zhang updated SPARK-20006:
-------------------------------
Description:
Currently both canBroadcast and canBuildLocalHashMap use the same configuration: AUTO_BROADCASTJOIN_THRESHOLD.
But the memory model may be different. For broadcast, currently the hash map is always build on heap. For shuffledHashJoin, the hash map may be build on heap(longHash), or off heap(other map if off heap is enabled). The same configuration makes the configuration hard to tune (how to allocate memory onheap/offheap). Propose to use different configuration. Please comments whether it is reasonable.
was:
Currently both canBroadcast and canBuildLocalHashMap use the same configuration: AUTO_BROADCASTJOIN_THRESHOLD.
But the memory model may be different. For broadcast, currently the hash map is always build on heap. For shuffledHashJoin, the hash map may be build on heap(longHash), or off heap(other map if off heap is enabled). The same configuration makes the configuration hard to tune (how to allocate memory onheap/offheap). Propose to use different configuration.
> Separate threshold for broadcast and shuffled hash join
> -------------------------------------------------------
>
> Key: SPARK-20006
> URL: https://issues.apache.org/jira/browse/SPARK-20006
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: Zhan Zhang
> Priority: Minor
>
> Currently both canBroadcast and canBuildLocalHashMap use the same configuration: AUTO_BROADCASTJOIN_THRESHOLD.
> But the memory model may be different. For broadcast, currently the hash map is always build on heap. For shuffledHashJoin, the hash map may be build on heap(longHash), or off heap(other map if off heap is enabled). The same configuration makes the configuration hard to tune (how to allocate memory onheap/offheap). Propose to use different configuration. Please comments whether it is reasonable.
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