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new 982baad5b8ad [SPARK-57536][SS] Use `maxOption` instead of
`sorted.lastOption` in `HDFSMetadataLog`
982baad5b8ad is described below
commit 982baad5b8ad8415f4d95a4e8bedd7ef016da66f
Author: Kousuke Saruta <[email protected]>
AuthorDate: Thu Jun 18 13:02:10 2026 -0700
[SPARK-57536][SS] Use `maxOption` instead of `sorted.lastOption` in
`HDFSMetadataLog`
### What changes were proposed in this pull request?
This PR replaces `listBatches.sorted.lastOption` with
`listBatches.maxOption` in `HDFSMetadataLog.getLatestBatchId()` and
`HDFSMetadataLog.getLatest()`.
### Why are the changes needed?
The intent of the code is to find the maximum batch ID. `sorted.lastOption`
sorts the entire array in O(n log n) to retrieve only the maximum element,
while `maxOption` achieves the same result in O(n). These methods are called on
every micro-batch in Structured Streaming, so avoiding unnecessary sorting
reduces overhead for long-running streaming jobs with many batches.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
GA
### Was this patch authored or co-authored using generative AI tooling?
Kiro CLI / Claude
Closes #56596 from sarutak/use-maxOption-in-HDFSMetadataLog.
Authored-by: Kousuke Saruta <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>
---
.../spark/sql/execution/streaming/checkpointing/HDFSMetadataLog.scala | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git
a/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/checkpointing/HDFSMetadataLog.scala
b/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/checkpointing/HDFSMetadataLog.scala
index fac502f75f3a..b06a90de44c4 100644
---
a/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/checkpointing/HDFSMetadataLog.scala
+++
b/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/checkpointing/HDFSMetadataLog.scala
@@ -266,10 +266,10 @@ class HDFSMetadataLog[T <: AnyRef : ClassTag](
}
/** Return the latest batch id without reading the file. */
- def getLatestBatchId(): Option[Long] = listBatches.sorted.lastOption
+ def getLatestBatchId(): Option[Long] = listBatches.maxOption
override def getLatest(): Option[(Long, T)] = {
- listBatches.sorted.lastOption.map { batchId =>
+ listBatches.maxOption.map { batchId =>
logInfo(log"Getting latest batch ${MDC(BATCH_ID, batchId)}")
(batchId, getExistingBatch(batchId))
}
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