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https://issues.apache.org/jira/browse/FLINK-14835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16982317#comment-16982317
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Victor Wong commented on FLINK-14835:
-------------------------------------
[~jark], after changing the return type of `Configuration`, `mvn clean verify`
failed because of japicmp error:
{code:java}
[ERROR] Failed to execute goal
com.github.siom79.japicmp:japicmp-maven-plugin:0.11.0:cmp (default) on project
flink-core: Breaking the build because there is at least one incompatibility:
org.apache.flink.configuration.Configuration.setBoolean(java.lang.String,boolean):METHOD_RETURN_TYPE_CHANGED,org.apache.flink.configuration.Configuration.setBytes(java.lang.String,byte[]):METHOD_RETURN_TYPE_CHANGED,org.apache.flink.configuration.Configuration.setClass(java.lang.String,java.lang.Class):METHOD_RETURN_TYPE_CHANGED,org.apache.flink.configuration.Configuration.setDouble(java.lang.String,double):METHOD_RETURN_TYPE_CHANGED,org.apache.flink.configuration.Configuration.setFloat(java.lang.String,float):METHOD_RETURN_TYPE_CHANGED,org.apache.flink.configuration.Configuration.setInteger(java.lang.String,int):METHOD_RETURN_TYPE_CHANGED,org.apache.flink.configuration.Configuration.setLong(java.lang.String,long):METHOD_RETURN_TYPE_CHANGED,org.apache.flink.configuration.Configuration.setString(java.lang.String,java.lang.String):METHOD_RETURN_TYPE_CHANGED
-> [Help 1]
{code}
It seems we have to give up this feature, right?
> Make `org.apache.flink.configuration.Configuration` support method chaining
> ---------------------------------------------------------------------------
>
> Key: FLINK-14835
> URL: https://issues.apache.org/jira/browse/FLINK-14835
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Configuration
> Affects Versions: 1.9.1
> Reporter: Victor Wong
> Priority: Major
>
> *Goal:*
> To make the following code examples work in production, which is very handy
> for users to set a couple of configurations:
> {code:java}
> // instantiate table environment
> TableEnvironment tEnv = ...tEnv.getConfig() // access high-level
> configuration
> .getConfiguration() // set low-level key-value options
> .setString("table.exec.mini-batch.enabled", "true") // enable mini-batch
> optimization
> .setString("table.exec.mini-batch.allow-latency", "5 s") // use 5 seconds
> to buffer input records
> .setString("table.exec.mini-batch.size", "5000"); // the maximum number of
> records can be buffered by each aggregate operator task
> {code}
>
> *Suggestion:*
> Currently, the return type of `setXXX` method is "void", we can make it
> return `Configuration` itself to support method chaining.
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