[
https://issues.apache.org/jira/browse/HIVE-8639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14252076#comment-14252076
]
Szehon Ho commented on HIVE-8639:
---------------------------------
[~brocknoland] yes there are tests that still do. The triggering factor is
whether the tests have "hive.auto.convert.sortmerge.join.to.mapjoin" turned on.
For example, all the auto_sortmerge_.* tests have at least one part that runs
SMB join before that flag is turned on.
[~xuefuz] can you review when you get a chance?
Test failures seem unrelated. I looked at join32_lessSize, it seems caused by
a TimeoutException in spark client's RPC layer.
{noformat}
Caused by: java.util.concurrent.TimeoutException: Timed out waiting for client
connection.
at org.apache.hive.spark.client.rpc.RpcServer$2.run(RpcServer.java:125)
{noformat}
> Convert SMBJoin to MapJoin [Spark Branch]
> -----------------------------------------
>
> Key: HIVE-8639
> URL: https://issues.apache.org/jira/browse/HIVE-8639
> Project: Hive
> Issue Type: Sub-task
> Components: Spark
> Affects Versions: spark-branch
> Reporter: Szehon Ho
> Assignee: Szehon Ho
> Attachments: HIVE-8639.1-spark.patch, HIVE-8639.2-spark.patch,
> HIVE-8639.3-spark.patch, HIVE-8639.3-spark.patch, HIVE-8639.4-spark.patch
>
>
> HIVE-8202 supports auto-conversion of SMB Join. However, if the tables are
> partitioned, there could be a slow down as each mapper would need to get a
> very small chunk of a partition which has a single key. Thus, in some
> scenarios it's beneficial to convert SMB join to map join.
> The task is to research and support the conversion from SMB join to map join
> for Spark execution engine. See the equivalent of MapReduce in
> SortMergeJoinResolver.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
