GitHub user fhueske opened a pull request:
https://github.com/apache/flink/pull/3912
[FLINK-6589] [core] Deserialize ArrayList with capacity of size+1 to
prevent growth.
Several Table API / SQL operators hold records in a `MapState[Long,
List[X]]` keyed on a timestamp.
When a new record arrives, the corresponding list is fetched and the record
is added to the list.
Currently, the `ListSerializer` deserializes lists as `ArrayList` with
capacity exactly equal to the number of serialized elements. Hence, the
`ArrayList` will grow when a new element is added which is an expensive
operation.
This PR changes the capacity of the deserialized `ArrayList` to #elements +
1 to avoid the growing the list when a single element is added.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/fhueske/flink listSer
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/3912.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 #3912
----
commit 1fa86b4e282ab0594d8dc768840de4c798e29591
Author: Fabian Hueske <[email protected]>
Date: 2017-05-15T19:41:51Z
[FLINK-6589] [core] Deserialize ArrayList with capacity of size+1 to
prevent growth.
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