Github user gaborhermann commented on the pull request:
https://github.com/apache/flink/pull/802#issuecomment-119321451
The main purpose of this is to enable a deterministic (non-time based) test
for iteration as it sometimes failed for some reason on Travis. (See [here]
(https://issues.apache.org/jira/browse/FLINK-2180?focusedCommentId=14576968&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14576968)).
I thought it might also be useful to users for debugging purposes (similarly
to maxWaitTime) and it was also easier to introduce it in the API level.
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