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| author | wangyang <wangyang@haizhi.com> | 2016-06-10 13:10:03 -0700 |
|---|---|---|
| committer | Reynold Xin <rxin@databricks.com> | 2016-06-10 13:10:03 -0700 |
| commit | 026eb90644be7685971dacaabae67a293edd0133 (patch) | |
| tree | cacc1ed1fb398d122bb5a46fd20b94574203fd58 /streaming | |
| parent | 865ec32dd997e63aea01a871d1c7b4947f43c111 (diff) | |
| download | spark-026eb90644be7685971dacaabae67a293edd0133.tar.gz spark-026eb90644be7685971dacaabae67a293edd0133.tar.bz2 spark-026eb90644be7685971dacaabae67a293edd0133.zip | |
[SPARK-15875] Try to use Seq.isEmpty and Seq.nonEmpty instead of Seq.length == 0 and Seq.length > 0
## What changes were proposed in this pull request?
In scala, immutable.List.length is an expensive operation so we should
avoid using Seq.length == 0 or Seq.lenth > 0, and use Seq.isEmpty and Seq.nonEmpty instead.
## How was this patch tested?
existing tests
Author: wangyang <wangyang@haizhi.com>
Closes #13601 from yangw1234/isEmpty.
Diffstat (limited to 'streaming')
| -rw-r--r-- | streaming/src/main/scala/org/apache/spark/streaming/dstream/TransformedDStream.scala | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/streaming/src/main/scala/org/apache/spark/streaming/dstream/TransformedDStream.scala b/streaming/src/main/scala/org/apache/spark/streaming/dstream/TransformedDStream.scala index 47eb9b806f..0dde120927 100644 --- a/streaming/src/main/scala/org/apache/spark/streaming/dstream/TransformedDStream.scala +++ b/streaming/src/main/scala/org/apache/spark/streaming/dstream/TransformedDStream.scala @@ -29,7 +29,7 @@ class TransformedDStream[U: ClassTag] ( transformFunc: (Seq[RDD[_]], Time) => RDD[U] ) extends DStream[U](parents.head.ssc) { - require(parents.length > 0, "List of DStreams to transform is empty") + require(parents.nonEmpty, "List of DStreams to transform is empty") require(parents.map(_.ssc).distinct.size == 1, "Some of the DStreams have different contexts") require(parents.map(_.slideDuration).distinct.size == 1, "Some of the DStreams have different slide durations") |