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https://issues.apache.org/jira/browse/DRILL-6310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16525929#comment-16525929
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ASF GitHub Bot commented on DRILL-6310:
---------------------------------------
Ben-Zvi commented on a change in pull request #1324: DRILL-6310: limit batch
size for hash aggregate
URL: https://github.com/apache/drill/pull/1324#discussion_r198702179
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/common/HashTableTemplate.java
##########
@@ -646,14 +647,18 @@ public PutStatus put(int incomingRowIdx, IndexPointer
htIdxHolder, int hashCode)
currentIdx = freeIndex++;
boolean addedBatch = false;
try { // ADD A BATCH
- addedBatch = addBatchIfNeeded(currentIdx);
+ addedBatch = addBatchIfNeeded(currentIdx, targetBatchRowCount);
+ if (addedBatch) {
+ // If we just added the batch, update the current index to point to
beginning of new batch.
+ currentIdx = (batchHolders.size() - 1) * BATCH_SIZE;
+ freeIndex = currentIdx + 1;
+ }
} catch (OutOfMemoryException OOME) {
- retryAfterOOM( currentIdx < batchHolders.size() * BATCH_SIZE );
+ retryAfterOOM( currentIdx < totalBatchHoldersSize);
Review comment:
*Just a comment:* The idea of using this "max, but not actual" size of batch
(the constant BATCH_SIZE) is on one hand smart (much less code needs to be
changed), but also a little awkward, as things don't mean exactly what they are
(e.g. totalBatchHolderSize).
Maybe in the future this code should be cleaned; e.g., keep a count of
the batches and compare to the count, instead of the not-real total.
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> limit batch size for hash aggregate
> -----------------------------------
>
> Key: DRILL-6310
> URL: https://issues.apache.org/jira/browse/DRILL-6310
> Project: Apache Drill
> Issue Type: Improvement
> Components: Execution - Flow
> Affects Versions: 1.13.0
> Reporter: Padma Penumarthy
> Assignee: Padma Penumarthy
> Priority: Major
> Fix For: 1.14.0
>
>
> limit batch size for hash aggregate based on memory.
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