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https://issues.apache.org/jira/browse/MAHOUT-788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13086359#comment-13086359
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Jeff Hansen commented on MAHOUT-788:
------------------------------------
By the way, the bug fix that initiated this behavior
(https://issues.apache.org/jira/browse/MAHOUT-679) also applies to
SequenceFileDumper and VectorDumper, but was never fixed there (so the output
is being flushed when the stream is unconditionally closed).
> ClusterDumper is never flushing output stream
> ---------------------------------------------
>
> Key: MAHOUT-788
> URL: https://issues.apache.org/jira/browse/MAHOUT-788
> Project: Mahout
> Issue Type: Bug
> Components: Clustering, Integration
> Affects Versions: 0.6
> Reporter: Jeff Hansen
> Assignee: Sean Owen
> Priority: Trivial
> Fix For: 0.6
>
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> ClusterDumper utility never calls flush on the OutputStreamWriter. As of
> issue https://issues.apache.org/jira/browse/MAHOUT-679, the output stream is
> never being closed when it defaults to System.out -- while that's a good
> thing, it would be nice to flush the stream before exiting the program. As
> is, when I run cluster dumper with the -b (substring) option set to something
> like 50, the stream never gets big enough to overflow the default buffer on
> my machine, so I see no output. Even when it does get big enough to overflow
> the buffer, I still miss the last cluster's summary. When the output is
> written to a file, the close() method usually flushes the buffer by default,
> but it shouldn't hurt to call the flush method either way -- therefore I'd
> suggest adding in an unconditional call to writer.flush(); in the finally
> block just before conditionally closing the writer. (line 199 in the
> org.apache.mahout.utils.clustering.ClusterDumper.run(String[] args) method)
> } finally {
> writer.flush();
> if (shouldClose) {
> Closeables.closeQuietly(writer);
> }
> }
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