gaborgsomogyi commented on a change in pull request #26502: [SPARK-29876][SS]
Delete/archive file source completed files in separate thread
URL: https://github.com/apache/spark/pull/26502#discussion_r346913035
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/FileStreamSource.scala
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@@ -342,7 +344,14 @@ object FileStreamSource {
def size: Int = map.size()
}
- private[sql] trait FileStreamSourceCleaner {
+ private[sql] abstract class FileStreamSourceCleaner {
+ protected val cleanThreadPool = ThreadUtils.newDaemonCachedThreadPool(
+ "file-source-cleaner-threadpool",
+ SQLConf.get.getConf(SQLConf.FILE_SOURCE_CLEANER_NUM_THREADS)
+ )
+
+ def stop(): Unit = cleanThreadPool.shutdown()
Review comment:
As far as I see even without this change we can loose file. Clean happens
after we've updated the checkpoint. If app dead happens after checkpoint update
but before clean then the file is lost. If we would like to give guarantees it
may lead far...
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