HeartSaVioR commented on code in PR #38430:
URL: https://github.com/apache/spark/pull/38430#discussion_r1011237000
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/HDFSMetadataLog.scala:
##########
@@ -64,6 +67,17 @@ class HDFSMetadataLog[T <: AnyRef : ClassTag](sparkSession:
SparkSession, path:
fileManager.mkdirs(metadataPath)
}
+ protected val metadataCacheEnabled: Boolean
+ =
sparkSession.sessionState.conf.getConf(SQLConf.STREAMING_METADATA_CACHE_ENABLED)
+
+ /**
+ * Cache the latest two batches. [[StreamExecution]] usually just accesses
the latest two batches
+ * when committing offsets, this cache will save some file system operations.
+ */
+ protected[sql] val batchCache = Collections.synchronizedMap(new
LinkedHashMap[Long, T](2) {
Review Comment:
I was going to say I wouldn't concern much about it since the instances of
HDFSMetadataLog are not many. But another point would be that whether 1) we
prefer having condition in if or 2) we prefer dealing with higher-level API
e.g. foreach. Given that most usages are also having another condition for if
statement, it doesn't seem to simplify the code.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org
