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Posted to dev@lucene.apache.org by "Han Jiang (JIRA)" <ji...@apache.org> on 2013/06/15 12:04:20 UTC
[jira] [Comment Edited] (LUCENE-5029) factor out a generic
'TermState' for better sharing in FST-based term dict
[ https://issues.apache.org/jira/browse/LUCENE-5029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13684121#comment-13684121 ]
Han Jiang edited comment on LUCENE-5029 at 6/15/13 10:02 AM:
-------------------------------------------------------------
Update reader part, now we can safely remove termBlockOrd in BlockTermState, which means the API
is OK for non-block based term dict. As for FST-based term dict,
Also, I remove 'nextTerm' from PostingsReaderBase as well (Since it's already defined in TermMetaData.read())
The remaining job is then to bring back TermStateOuputs.
The patch is still against trunk, but strange that it fails on this single test:
{code}
ant test -Dtestcase=TestDrillSideways -Dtests.method=testRandom -Dtests.seed=7FEAE9B6DF414156 -Dtests.slow=true -Dtests.postingsformat=TempBlock -Dtests.locale=ar_KW -Dtests.timezone=America/Indiana/Winamac -Dtests.file.encoding=US-ASCII
{code}
But I suppose it is unrelated?
was (Author: billy):
Update reader part, now we can safely remove termBlockOrd in BlockTermState, which means the API is OK for non-block based term dict. As for FST-based term dict,
the remaining job is to then bring back TermStateOuputs.
The patch is still against trunk, but strange that it will fail on this single test:
{code}
ant test -Dtestcase=TestDrillSideways -Dtests.method=testRandom -Dtests.seed=7FEAE9B6DF414156 -Dtests.slow=true -Dtests.postingsformat=TempBlock -Dtests.locale=ar_KW -Dtests.timezone=America/Indiana/Winamac -Dtests.file.encoding=US-ASCII
{code}
But I suppose it is unrelated?
> factor out a generic 'TermState' for better sharing in FST-based term dict
> --------------------------------------------------------------------------
>
> Key: LUCENE-5029
> URL: https://issues.apache.org/jira/browse/LUCENE-5029
> Project: Lucene - Core
> Issue Type: Sub-task
> Reporter: Han Jiang
> Assignee: Han Jiang
> Priority: Minor
> Fix For: 4.4
>
> Attachments: LUCENE-5029.algebra.patch, LUCENE-5029.algebra.patch, LUCENE-5029.patch, LUCENE-5029.patch, LUCENE-5029.patch, LUCENE-5029.patch
>
>
> Currently, those two FST-based term dict (memory codec & blocktree) all use FST<BytesRef> as a base data structure, this might not share much data in parent arcs, since the encoded BytesRef doesn't guarantee that 'Outputs.common()' always creates a long prefix.
> While for current postings format, it is guaranteed that each FP (pointing to .doc, .pos, etc.) will increase monotonically with 'larger' terms. That means, between two Outputs, the Outputs from smaller term can be safely pushed towards root. However we always have some tricky TermState to deal with (like the singletonDocID for pulsing trick), so as Mike suggested, we can simply cut the whole TermState into two parts: one part for comparation and intersection, another for restoring generic data. Then the data structure will be clear: this generic 'TermState' will consist of a fixed-length LongsRef and variable-length BytesRef.
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