LuciferYang commented on code in PR #36237:
URL: https://github.com/apache/spark/pull/36237#discussion_r852703387
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core/src/main/scala/org/apache/spark/deploy/history/FsHistoryProvider.scala:
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@@ -325,12 +325,18 @@ private[history] class FsHistoryProvider(conf: SparkConf,
clock: Clock)
override def getListing(): Iterator[ApplicationInfo] = {
// Return the listing in end time descending order.
- listing.view(classOf[ApplicationInfoWrapper])
+ // SPARK-38896: tryWithResource cannot be used here
+ // because this method needs to return an `Iterator`.
+ val closeableIter = listing.view(classOf[ApplicationInfoWrapper])
.index("endTime")
.reverse()
- .iterator()
- .asScala
- .map(_.toApplicationInfo())
+ .closeableIterator()
+ val dataIter = closeableIter.asScala.map(_.toApplicationInfo())
+ new Iterator[ApplicationInfo] with Closeable {
+ override def hasNext: Boolean = dataIter.hasNext
+ override def next(): ApplicationInfo = dataIter.next()
+ override def close(): Unit = closeableIter.close()
+ }
Review Comment:
Or we can return
```
KVUtils.mapToSeq(listing.view(classOf[ApplicationInfoWrapper])
.index("endTime")
.reverse())(_.toApplicationInfo()).iterator
```
This seems simpler, and the caller doesn't need to care about closing
`LevelDB/RocksDBIterator`, but it may use more memory
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