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https://issues.apache.org/jira/browse/HBASE-8700?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergey Shelukhin updated HBASE-8700:
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Description:
The test can fail due to random number collision, claiming there are
unreferenced elements for obvious reasons (we rewrite some link). Original
Accumulo test has one-stage generation so it doesn't count unreferenced
elements as failures, only undefined ones. With 200m longs out of half-long
range the probability of collision is approx 0.2%.
Moreover, without some way to debug, it's hard to debug what keys should be
looked at in such cases
was:We have a failure in the above test where one element is missing yet it
is not referenced-undefined, so it looks like a head of the list with previous
element disappearing; however such an eventuality would require a link from
tail to head to also disappear (otherwise there'd be a referenced-undefined
element), which is quite a coincidence. Without some way to debug, it's hard to
debug what keys should be looked at.
> IntegrationTestBigLinkedList can fail due to random number collision
> --------------------------------------------------------------------
>
> Key: HBASE-8700
> URL: https://issues.apache.org/jira/browse/HBASE-8700
> Project: HBase
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
>
> The test can fail due to random number collision, claiming there are
> unreferenced elements for obvious reasons (we rewrite some link). Original
> Accumulo test has one-stage generation so it doesn't count unreferenced
> elements as failures, only undefined ones. With 200m longs out of half-long
> range the probability of collision is approx 0.2%.
> Moreover, without some way to debug, it's hard to debug what keys should be
> looked at in such cases
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