Fabian Hueske created FLINK-11825:
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Summary: Resolve name clash of StateTTL TimeCharacteristic class
Key: FLINK-11825
URL: https://issues.apache.org/jira/browse/FLINK-11825
Project: Flink
Issue Type: Improvement
Components: Runtime / State Backends
Affects Versions: 1.7.2
Reporter: Fabian Hueske
The StateTTL feature introduced the class
\{{org.apache.flink.api.common.state.TimeCharacteristic}} which clashes with
\{{org.apache.flink.streaming.api.TimeCharacteristic}}.
This is a problem for two reasons:
1. Users get confused because the mistakenly import
\{{org.apache.flink.api.common.state.TimeCharacteristic}}.
2. When using the StateTTL feature, users need to spell out the package name
for \{{org.apache.flink.api.common.state.TimeCharacteristic}} because the other
class is most likely already imported.
Since \{{org.apache.flink.streaming.api.TimeCharacteristic}} is one of the most
used classes of the DataStream API, we should make sure that users can use it
without import problems.
These error are hard to spot and confusing for many users.
I see two ways to resolve the issue:
1. drop \{{org.apache.flink.api.common.state.TimeCharacteristic}} and use
\{{org.apache.flink.streaming.api.TimeCharacteristic}} throwing an exception if
an incorrect characteristic is used.
2. rename the class \{{org.apache.flink.api.common.state.TimeCharacteristic}}
to some other name.
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