[jira] [Created] (FLINK-3888) Custom Aggregator with Convergence can't be registered directly with DeltaIteration

["Martin Liesenberg (JIRA)" <ji...@apache.org>]

Martin Liesenberg created FLINK-3888:
----------------------------------------

             Summary: Custom Aggregator with Convergence can't be registered directly with DeltaIteration
                 Key: FLINK-3888
                 URL: https://issues.apache.org/jira/browse/FLINK-3888
             Project: Flink
          Issue Type: Bug
            Reporter: Martin Liesenberg


Contrary to the [documentation|https://ci.apache.org/projects/flink/flink-docs-master/apis/batch/iterations.html] the method to add an aggregator with a custom convergence criterion to a DeltaIteration is not exposed directly to DeltaIteration, but can only be accessed via the {{aggregatorRegistry}}.
Moreover, when registering an aggregator with a custom convergence criterion  and running the program, the following exception appears in the logs:
{noformat}
Error: Cannot use custom convergence criterion with workset iteration. Workset iterations have implicit convergence criterion where workset is empty.
org.apache.flink.optimizer.CompilerException: Error: Cannot use custom convergence criterion with workset iteration. Workset iterations have implicit convergence criterion where workset is empty.
	at org.apache.flink.optimizer.plantranslate.JobGraphGenerator.finalizeWorksetIteration(JobGraphGenerator.java:1518)
	at org.apache.flink.optimizer.plantranslate.JobGraphGenerator.compileJobGraph(JobGraphGenerator.java:198)
	at org.apache.flink.optimizer.plantranslate.JobGraphGenerator.compileJobGraph(JobGraphGenerator.java:164)
	at org.apache.flink.test.util.TestEnvironment.execute(TestEnvironment.java:76)
	at org.apache.flink.api.java.ExecutionEnvironment.execute(ExecutionEnvironment.java:898)
	at org.apache.flink.api.java.DataSet.collect(DataSet.java:410)
	at org.apache.flink.api.java.DataSet.print(DataSet.java:1605)
{noformat}

The issue has been found while discussing FLINK-2926



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)