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
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