Repository: spark
Updated Branches:
  refs/heads/master 4b4ee2601 -> f77270b88


[SPARK-23358][CORE] When the number of partitions is greater than 2^28, it will 
result in an error result

## What changes were proposed in this pull request?
In the `checkIndexAndDataFile`,the `blocks` is the ` Int` type,  when it is 
greater than 2^28, `blocks*8` will overflow, and this will result in an error 
result.
In fact, `blocks` is actually the number of partitions.

## How was this patch tested?
Manual test

Author: liuxian <liu.xi...@zte.com.cn>

Closes #20544 from 10110346/overflow.


Project: http://git-wip-us.apache.org/repos/asf/spark/repo
Commit: http://git-wip-us.apache.org/repos/asf/spark/commit/f77270b8
Tree: http://git-wip-us.apache.org/repos/asf/spark/tree/f77270b8
Diff: http://git-wip-us.apache.org/repos/asf/spark/diff/f77270b8

Branch: refs/heads/master
Commit: f77270b8811bbd8956d0c08fa556265d2c5ee20e
Parents: 4b4ee26
Author: liuxian <liu.xi...@zte.com.cn>
Authored: Fri Feb 9 08:45:06 2018 -0600
Committer: Sean Owen <so...@cloudera.com>
Committed: Fri Feb 9 08:45:06 2018 -0600

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 .../scala/org/apache/spark/shuffle/IndexShuffleBlockResolver.scala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/spark/blob/f77270b8/core/src/main/scala/org/apache/spark/shuffle/IndexShuffleBlockResolver.scala
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diff --git 
a/core/src/main/scala/org/apache/spark/shuffle/IndexShuffleBlockResolver.scala 
b/core/src/main/scala/org/apache/spark/shuffle/IndexShuffleBlockResolver.scala
index c5f3f6e..d88b25c 100644
--- 
a/core/src/main/scala/org/apache/spark/shuffle/IndexShuffleBlockResolver.scala
+++ 
b/core/src/main/scala/org/apache/spark/shuffle/IndexShuffleBlockResolver.scala
@@ -84,7 +84,7 @@ private[spark] class IndexShuffleBlockResolver(
    */
   private def checkIndexAndDataFile(index: File, data: File, blocks: Int): 
Array[Long] = {
     // the index file should have `block + 1` longs as offset.
-    if (index.length() != (blocks + 1) * 8) {
+    if (index.length() != (blocks + 1) * 8L) {
       return null
     }
     val lengths = new Array[Long](blocks)


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