GitHub user jinxing64 opened a pull request:
https://github.com/apache/spark/pull/18211
[WIP][SPARK-20994] Alleviate memory pressure in StreamManager
## What changes were proposed in this pull request?
In current code, chunks are fetched from shuffle service in two steps:
Step-1. Send `OpenBlocks`, which contains the blocks list to to fetch;
Step-2. Fetch the consecutive chunks from shuffle-service by `streamId` and
`chunkIndex`
Conceptually, there is no need to send the blocks list in step-1. Client
can send the blockId in Step-2. Receiving `ChunkFetchRequest`, server can check
if the chunkId is in local block manager and send back response.
Thus memory cost can be improved.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jinxing64/spark SPARK-20994
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18211.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #18211
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commit 883089aa824dabfb9b82a17546a953f1f0a22be4
Author: jinxing <[email protected]>
Date: 2017-06-05T09:19:18Z
[SPARK-20994] Alleviate memory pressure in StreamManager
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