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https://issues.apache.org/jira/browse/ACCUMULO-2608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13971674#comment-13971674
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Keith Turner commented on ACCUMULO-2608:
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Some things to consider :
* Test nodes make random decisions. For example the shard Insert nodes
generates random documents. So even if you visited notes in the Shard test in
the same order, completely different things could happen because different data
was generated. This could possibly be addressed by using the same PRNG and
seeding it the same.
* Concurrent walkers will generate multiple trails/paths. Replaying those
trail concurrently will very likely not result in the same sequence of events
globally.
* The XML file the ticket mentions generating and XML file. This may not fit
in memory.
In my experience when I rerun random walk I usually see the same bugs. If I
only see a bug once over weeks of running random walk on 20 nodes, it indicates
that the bug may be improbable and therefore of a lower priority. There are
certainly a few bugs that I only ever saw once in random walk and could not
figure them and never saw them again. I saw these on a cluster w/ many walkers.
> Create a randomwalk replay meta-node
> ------------------------------------
>
> Key: ACCUMULO-2608
> URL: https://issues.apache.org/jira/browse/ACCUMULO-2608
> Project: Accumulo
> Issue Type: New Feature
> Components: test
> Reporter: Mike Drob
> Assignee: Bill Havanki
> Priority: Critical
> Fix For: 1.4.6, 1.5.2, 1.6.1
>
>
> It would be useful to have the ability to replay randomwalk sequences.
> If a randomwalk fails, it is often difficult to reproduce due to the random
> nature of things. If current test runs were modified to output a specially
> crafted module representing their sequence, then future runs could accept it
> as the module to run and improve reproduction capabilities.
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