GitHub user brkyvz opened a pull request:
https://github.com/apache/spark/pull/18595
[SPARK-21370][SS] Create distinction between read-only and read-write state
stores
## What changes were proposed in this pull request?
Currently the HDFSBackedStateStore sets it's state as UPDATING as it is
initialized.
For every trigger, we create two state stores, one used during "Restore"
and one during "Save". The "Restore" StateStore is read-only. This state store
gets "aborted" after a task is completed, which results in a file being created
and immediately deleted.
This can be avoided if there is an INITIALIZED state and abort deletes
files only when there is an update to the state store using "put" or "remove".
## How was this patch tested?
Unit tests in `StateStoreSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/brkyvz/spark read-only-state-store
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18595.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 #18595
----
commit 6d208f5e3bed657bedd5838595efa8d14ff3be33
Author: Burak Yavuz <[email protected]>
Date: 2017-07-11T00:00:53Z
create distinction between read-only and read-write state stores
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