[SPARK-16580][CORE] class Accumulator in package spark is deprecated: use AccumulatorV2

[keypointt]

https://issues.apache.org/jira/browse/SPARK-16580#

What changes were proposed in this pull request?

When I was working on the R wrapper, I found the compile warn.

> project mllib
> console
[warn] /Users/renxin/workspace/spark/core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala:78: class Accumulator in package spark is deprecated: use AccumulatorV2
[warn]     accumulator: Accumulator[JList[Array[Byte]]])
[warn]
[warn] /Users/renxin/workspace/spark/core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala:78: class Accumulator in package spark is deprecated: use AccumulatorV2
[warn]     accumulator: Accumulator[JList[Array[Byte]]])
[warn]
[warn] /Users/renxin/workspace/spark/core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala:78: class Accumulator in package spark is deprecated: use AccumulatorV2
[warn]     accumulator: Accumulator[JList[Array[Byte]]])
[warn]
[warn] /Users/renxin/workspace/spark/core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala:71: class Accumulator in package spark is deprecated: use AccumulatorV2
[warn] private[spark] case class PythonFunction(
[warn]
[warn] /Users/renxin/workspace/spark/core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala:78: class Accumulator in package spark is deprecated: use AccumulatorV2
[warn]     accumulator: Accumulator[JList[Array[Byte]]])
[warn]
[warn] /Users/renxin/workspace/spark/core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala:873: trait AccumulatorParam in package spark is deprecated: use AccumulatorV2
[warn]   extends AccumulatorParam[JList[Array[Byte]]] {
[warn]
[warn] /Users/renxin/workspace/spark/core/src/main/scala/org/apache/spark/util/AccumulatorV2.scala:459: trait AccumulableParam in package spark is deprecated: use AccumulatorV2
[warn]     param: org.apache.spark.AccumulableParam[R, T]) extends AccumulatorV2[T, R] {
[warn]
[warn] /Users/renxin/workspace/spark/core/src/main/scala/org/apache/spark/util/AccumulatorV2.scala:459: trait AccumulableParam in package spark is deprecated: use AccumulatorV2
[warn]     param: org.apache.spark.AccumulableParam[R, T]) extends AccumulatorV2[T, R] {
[warn]

Using AccumulatorV2 and warnings on "PythonRDD.scala:78" and "PythonRDD.scala:71" disappeared.

I didn't change AccumulableParam or AccumulatorParam, since they are being used in class LegacyAccumulatorWrapper of AccumulatorV2.

How was this patch tested?

Tested manually on my laptop.

[SparkQA]

Test build #62389 has finished for PR 14226 at commit 84db726.

• This patch fails PySpark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[srowen]

@keypointt what do you think about following up on this?

[keypointt]

@srowen sorry, I had a very busy week passed, now I have time to look into it. Will keep you posted :)

[SparkQA]

Test build #63192 has finished for PR 14226 at commit fe83dd9.

• This patch fails PySpark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[MLnick]

I think #14467 is addressing this, and seems to be further along (it is a little more involved to make it work than what you have here)

[srowen]

Yeah let's close this one as a duplicate

[keypointt]

sure, closing it