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https://issues.apache.org/jira/browse/ACCUMULO-1471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13670432#comment-13670432
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Keith Turner commented on ACCUMULO-1471:
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bq. it just being a hint that different iterators will respect to different
degrees (and generally, you might get back results that are outside the range
specified)
The basic stack built by Mock and Accumulo does not treat the range and col
fams as a hint. When iterators are independently pulled out of this system
stack, the behavior may be different.
I should have outlined the history. A long time ago Accumulo actually built
the system stack as follows.
MultiIterator(RFile(ColumnFamilySkippingIterator(LGroup())),
RFile(ColumnFamilySkippingIterator(LGroup())),
ColumnFamilySkippingIterator(InMemMap()))
With this use case, ColumnFamilySkippingIterator() would not pass column fams
to data source iterators like Rfile.LGroup(), InMemMap(), and SortedMapIter.
Also the data source iterators used to throw an exception if column fams were
passed. Howerver this led to severe performance problems in some cases.
ColumnFamilySkippingIterator was moved above MultiIterator and modified to pass
columns as a hint to data sources. Data sources were modified to accept column
fams, with the understanding that filtering would always be done above.
Currently rfile is only data source that uses this hint, in the future the in
memory map will support locality groups and use this hint also.
The javadoc I am thinking of is specifically for SortedMapIterator, encouraging
wrapping it w/ ColumnFamilySkippingIterator if using it directly.
> SortedMapIterator.seek() doesn't respect columnFamilies
> -------------------------------------------------------
>
> Key: ACCUMULO-1471
> URL: https://issues.apache.org/jira/browse/ACCUMULO-1471
> Project: Accumulo
> Issue Type: Bug
> Components: client
> Affects Versions: 1.4.3, 1.5.0
> Reporter: Michael Berman
> Priority: Minor
> Fix For: 1.5.1, 1.6.0
>
>
> If you specify columnFamilies in a seek() on a SortedMapIterator, it will
> happily return results from other column families. The arguments are never
> even read.
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