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https://issues.apache.org/jira/browse/FLINK-11167?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Congxian Qiu reassigned FLINK-11167:
------------------------------------
Assignee: Congxian Qiu
> Optimize RocksDBList#put for no empty input
> -------------------------------------------
>
> Key: FLINK-11167
> URL: https://issues.apache.org/jira/browse/FLINK-11167
> Project: Flink
> Issue Type: Improvement
> Reporter: Congxian Qiu
> Assignee: Congxian Qiu
> Priority: Major
>
> In `RocksDBListState.putInternal` we will first remove the current state and
> then add the new list if needed(list is no empty) such as below.
> I think if the list is not empty, we could {color:#FF0000}skip the remove
> operation{color}.
>
> {code:java}
> public void updateInternal(List<V> values) {
> Preconditions.checkNotNull(values, "List of values to add cannot be
> null.");
> clear();
> if (!values.isEmpty()) {
> try {
> writeCurrentKeyWithGroupAndNamespace();
> byte[] key = dataOutputView.getCopyOfBuffer();
> byte[] premerge = getPreMergedValue(values, elementSerializer,
> dataOutputView);
> backend.db.put(columnFamily, writeOptions, key, premerge);
> } catch (IOException | RocksDBException e) {
> throw new FlinkRuntimeException("Error while updating data to
> RocksDB", e);
> }
> }
> }
> {code}
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