c21 commented on a change in pull request #29079:
URL: https://github.com/apache/spark/pull/29079#discussion_r456862018
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
##########
@@ -2659,12 +2660,24 @@ object SQLConf {
buildConf("spark.sql.bucketing.coalesceBucketsInSortMergeJoin.maxBucketRatio")
.doc("The ratio of the number of two buckets being coalesced should be
less than or " +
"equal to this value for bucket coalescing to be applied. This
configuration only " +
- s"has an effect when
'${COALESCE_BUCKETS_IN_SORT_MERGE_JOIN_ENABLED.key}' is set to true.")
+ s"has an effect when '${COALESCE_BUCKETS_IN_JOIN_ENABLED.key}' is set
to true.")
.version("3.1.0")
.intConf
.checkValue(_ > 0, "The difference must be positive.")
.createWithDefault(4)
+ val COALESCE_BUCKETS_IN_SHUFFLED_HASH_JOIN_MAX_BUCKET_RATIO =
+
buildConf("spark.sql.bucketing.coalesceBucketsInShuffledHashJoin.maxBucketRatio")
+ .doc("The ratio of the number of two buckets being coalesced should be
less than or " +
+ "equal to this value for bucket coalescing to be applied. This
configuration only " +
+ s"has an effect when '${COALESCE_BUCKETS_IN_JOIN_ENABLED.key}' is set
to true. " +
+ "Note as coalescing reduces parallelism, there might be a higher risk
for " +
+ "out of memory error at shuffled hash join build side.")
+ .version("3.1.0")
+ .intConf
+ .checkValue(_ > 0, "The difference must be positive.")
+ .createWithDefault(2)
Review comment:
Sounds good. Updated to single ratio config for SMJ and SHJ. Thanks. cc
@maropu and @viirya.
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