GitHub user tdas opened a pull request:
https://github.com/apache/spark/pull/11645
[WIP][SPARK-13809][SQL] State store for streaming aggregations
## What changes were proposed in this pull request?
In this PR, I am implementing a new abstraction for management of streaming
state data - State Store. It is a key-value store for persisting running
aggregates for aggregate operations in streaming dataframes. The motivation and
design is discussed here.
https://docs.google.com/document/d/1-ncawFx8JS5Zyfq1HAEGBx56RDet9wfVp_hDM8ZL254/edit#
## How was this patch tested?
Unit tests (WIP)
## TODO
[ ] Unit tests
- [ ] StateStoreCoordinator
- [ ] StateStoreRDD fault-tolerance
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/tdas/spark state-store
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11645.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 #11645
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commit c0194744378c2b1827aa6bb3a6109b3549710a44
Author: Tathagata Das <tathagata.das1...@gmail.com>
Date: 2016-03-10T23:02:37Z
First draft of StateStore
commit 4f8dade98ab2720ffab78a6ace567b9705f1b488
Author: Tathagata Das <tathagata.das1...@gmail.com>
Date: 2016-03-11T01:50:50Z
Updated tests
commit f417bde8bd65572e78125c7aa900221fa0bc4d7c
Author: Tathagata Das <tathagata.das1...@gmail.com>
Date: 2016-03-11T04:24:39Z
Added basic unit test for StateStoreRDD
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