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https://issues.apache.org/jira/browse/FLINK-1085?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14118108#comment-14118108
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Fabian Hueske commented on FLINK-1085:
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The same applies to the {{SynchronousChainedCombineDriver}}.
> Unnecessary failing of GroupReduceCombineDriver
> -----------------------------------------------
>
> Key: FLINK-1085
> URL: https://issues.apache.org/jira/browse/FLINK-1085
> Project: Flink
> Issue Type: Bug
> Components: Local Runtime
> Affects Versions: 0.7-incubating, 0.6.1-incubating
> Reporter: Fabian Hueske
> Labels: starter
>
> With a recent update (commit cbbcf7820885a8a9734ffeba637b0182a6637939) the
> GroupReduceCombineDriver was changed to not use an asynchronous partial
> sorter. Instead, the driver fills a sort buffer with records, sorts it,
> combines them, clears the buffer, and continues to fill it again.
> The GroupReduceCombineDriver fails if a record cannot be serialized into an
> empty sort buffer, i.e., if the record is too large for the buffer.
> Alternatively, we should emit a WARN message for the first record that is too
> large and just forward all records which do not fit into the empty sort
> buffer (maybe continue to count how many records were simply forwarded and
> give a second WARN message with this statistic).
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