Caizhi Weng created FLINK-17083: ----------------------------------- Summary: Restrict users of accumulators not to return null in Accumulator#getLocalValue Key: FLINK-17083 URL: https://issues.apache.org/jira/browse/FLINK-17083 Project: Flink Issue Type: Improvement Components: API / Core Affects Versions: 1.11.0 Reporter: Caizhi Weng
[This discussion|https://issues.apache.org/jira/browse/FLINK-13880] raises a problem that, if a user returns a null value in {{Accumulator#getLocalValue}}, he will be notified that the {{failureCause}} should not be null when fetching the accumulator result, which seems to be really wired. The problem is that we're not explicitly restricting the users not to return null values in {{Accumulator#getLocalValue}}. [~aljoscha] is it legal to return null values? If not, we should explicitly throws a related exception to the users instead of giving the users a somewhat unrelated exception. -- This message was sent by Atlassian Jira (v8.3.4#803005)