HyukjinKwon commented on a change in pull request #25552: [SPARK-28849][CORE]
Add a number to control transferTo calls to avoid infinite loop in some
occasional cases
URL: https://github.com/apache/spark/pull/25552#discussion_r321991001
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File path: core/src/main/scala/org/apache/spark/internal/config/package.scala
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@@ -1407,4 +1407,13 @@ package object config {
.bytesConf(ByteUnit.BYTE)
.createOptional
+ private[spark] val TRANSFERTO_NUM_CALLS =
+ ConfigBuilder("spark.file.transferToZeroReturns")
+ .doc("To track the numbers of 0 return value of Java NIO's transferTo. "
+
+ "In some occasional case, Spark's copyFileStreamNIO will always return
zero and " +
+ "run into infinite loop, this configuration is used to track the
number of return 0 and " +
+ "jump out of loop in time. This is an internal configuration, " +
+ "user shouldn't configure it normally")
+ .intConf
Review comment:
@jerryshao, actually I think it might be better to consider more
conservative way to note this is an internal configuration via `.internal()`.
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