From ce0051d6f7e4ed54076676644c78b52b527ba190 Mon Sep 17 00:00:00 2001 From: Calvin Jia Date: Mon, 25 May 2015 16:50:43 -0700 Subject: [PATCH] [SPARK-6391][DOCS] Document Tachyon compatibility. Adds a section in the RDD persistence section of the programming-guide docs detailing Spark-Tachyon version compatibility as discussed in [[SPARK-6391]](https://issues.apache.org/jira/browse/SPARK-6391). Author: Calvin Jia Closes #6382 from calvinjia/spark-6391 and squashes the following commits: 113e863 [Calvin Jia] Move compatibility info to the offheap storage level section. 7942dc5 [Calvin Jia] Add a section in the programming-guide docs for Tachyon compatibility. --- docs/programming-guide.md | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/docs/programming-guide.md b/docs/programming-guide.md index 5d9df282efed8..10f474f237bfa 100644 --- a/docs/programming-guide.md +++ b/docs/programming-guide.md @@ -1214,9 +1214,11 @@ storage levels is: Compared to MEMORY_ONLY_SER, OFF_HEAP reduces garbage collection overhead and allows executors to be smaller and to share a pool of memory, making it attractive in environments with large heaps or multiple concurrent applications. Furthermore, as the RDDs reside in Tachyon, - the crash of an executor does not lead to losing the in-memory cache. In this mode, the memory + the crash of an executor does not lead to losing the in-memory cache. In this mode, the memory in Tachyon is discardable. Thus, Tachyon does not attempt to reconstruct a block that it evicts - from memory. + from memory. If you plan to use Tachyon as the off heap store, Spark is compatible with Tachyon + out-of-the-box. Please refer to this page + for the suggested version pairings.