Repository: spark Updated Branches: refs/heads/master fa13301ae -> 7276fa9aa
[SPARK-11751] Doc describe error in the "Spark Streaming Programming Guide" page In the **[Task Launching Overheads](http://spark.apache.org/docs/latest/streaming-programming-guide.html#task-launching-overheads)** section, >Task Serialization: Using Kryo serialization for serializing tasks can reduce >the task sizes, and therefore reduce the time taken to send them to the slaves. as we known **Task Serialization** is configuration by **spark.closure.serializer** parameter, but currently only the Java serializer is supported. If we set **spark.closure.serializer** to **org.apache.spark.serializer.KryoSerializer**, then this will throw a exception. Author: yangping.wu <wyphao.2...@163.com> Closes #9734 from 397090770/397090770-patch-1. Project: http://git-wip-us.apache.org/repos/asf/spark/repo Commit: http://git-wip-us.apache.org/repos/asf/spark/commit/7276fa9a Tree: http://git-wip-us.apache.org/repos/asf/spark/tree/7276fa9a Diff: http://git-wip-us.apache.org/repos/asf/spark/diff/7276fa9a Branch: refs/heads/master Commit: 7276fa9aa9d2eccb6aebd5c690ac334699142f1e Parents: fa13301 Author: yangping.wu <wyphao.2...@163.com> Authored: Tue Nov 17 14:11:34 2015 +0000 Committer: Sean Owen <so...@cloudera.com> Committed: Tue Nov 17 14:11:34 2015 +0000 ---------------------------------------------------------------------- docs/streaming-programming-guide.md | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/spark/blob/7276fa9a/docs/streaming-programming-guide.md ---------------------------------------------------------------------- diff --git a/docs/streaming-programming-guide.md b/docs/streaming-programming-guide.md index e9a27f4..96b36b7 100644 --- a/docs/streaming-programming-guide.md +++ b/docs/streaming-programming-guide.md @@ -2001,8 +2001,7 @@ If the number of tasks launched per second is high (say, 50 or more per second), of sending out tasks to the slaves may be significant and will make it hard to achieve sub-second latencies. The overhead can be reduced by the following changes: -* **Task Serialization**: Using Kryo serialization for serializing tasks can reduce the task - sizes, and therefore reduce the time taken to send them to the slaves. +* **Task Serialization**: Using Kryo serialization for serializing tasks can reduce the task sizes, and therefore reduce the time taken to send them to the slaves. This is controlled by the ```spark.closure.serializer``` property. However, at this time, Kryo serialization cannot be enabled for closure serialization. This may be resolved in a future release. * **Execution mode**: Running Spark in Standalone mode or coarse-grained Mesos mode leads to better task launch times than the fine-grained Mesos mode. Please refer to the --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@spark.apache.org For additional commands, e-mail: commits-h...@spark.apache.org
