ngsg commented on code in PR #5478:
URL: https://github.com/apache/hive/pull/5478#discussion_r2018603799
##########
ql/src/java/org/apache/hadoop/hive/ql/exec/OperatorUtils.java:
##########
@@ -385,17 +385,22 @@ public static int countOperatorsUpstream(Operator<?>
start, Set<Class<? extends
}
public static void setMemoryAvailable(final List<Operator<? extends
OperatorDesc>> operators,
- final long memoryAvailableToTask) {
- if (operators == null) {
+ final long memoryAvailable) {
+ if (operators == null || operators.isEmpty()) {
return;
}
+ final long memoryAvailablePerOperator = memoryAvailable / operators.size();
Review Comment:
I think we could use a number less than `operators.size()` since not all
operators require significant memory that should be managed by
`getMaxMemoryAvailable()`. For instance, we can likely ignore select and filter
operators, as they behave more like fire-and-forget operations and do not
consume much memory. Given that `OperatorDesc.getMaxMemoryAvailable()` is
referenced by MapJoin, ReduceSink (with TopN), and GroupBy (with Hash Aggregate
Mode), I think #MapJoin + #(RS with TopN) + #(GBY with HashMode) + 1(for the
rest) could be a candidate.
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