GitHub user sihuazhou opened a pull request:
https://github.com/apache/flink/pull/5979
[FLINK-9070][state]improve the performance of RocksDBMapState.clear()
## What is the purpose of the change
This PR intend to improve the performance of `RocksDBMapState.clear()` base
on the follow things:
- Using RocksIterator to iterate the records directly (currently we use the
RocksDBMapIterator, witch will buffer the records and may also need to perform
seeking multi times.)
- Using WriteBatch to perform deleting in bulk.
## Brief change log
- *improve the `RocksDBMapState.clear()` via iterating the records
directly and deleting records using WriteBatch.*
## Verifying this change
This change is already covered by existing tests,.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (no)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (no)
- The serializers: (no)
- The runtime per-record code paths (performance sensitive): (no)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
- The S3 file system connector: (no)
## Documentation
no
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sihuazhou/flink improveMapStateClear
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/5979.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 #5979
----
commit 969036a32b49b32a4168afb747dff54fe9ada6e6
Author: sihuazhou <summerleafs@...>
Date: 2018-04-07T13:52:05Z
improve the RocksDBMapState.clear() via iterate the records directly and
delete records using WriteBatch.
----
---
