Github user uncleGen commented on a diff in the pull request:
https://github.com/apache/spark/pull/15852#discussion_r87936909
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/CompactibleFileStreamLog.scala
---
@@ -63,7 +63,60 @@ abstract class CompactibleFileStreamLog[T <: AnyRef :
ClassTag](
protected def isDeletingExpiredLog: Boolean
- protected def compactInterval: Int
+ protected def defaultCompactInterval: Int
+
+ protected final lazy val compactInterval: Int = {
+ // SPARK-18187: "compactInterval" can be set by user via
defaultCompactInterval.
+ // If there are existing log entries, then we should ensure a
compatible compactInterval
+ // is used, irrespective of the defaultCompactInterval. There are
three cases:
+ //
+ // 1. If there is no '.compact' file, we can use the default setting
directly.
+ // 2. If there are two or more '.compact' files, we use the interval
of patch id suffix with
+ // '.compact' as compactInterval. It is unclear whether this case will
ever happen in the
+ // current code, since only the latest '.compact' file is retained
i.e., other are garbage
+ // collected.
--- End diff --
The log garbage operation is controlled by
'spark.sql.streaming.fileSource.log.deletion'. When it is 'false', there may be
two or more '.compact' files
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