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From "Michael Busch (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1879) Parallel incremental indexing
Date Fri, 06 Nov 2009 17:43:32 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12774329#action_12774329
] 

Michael Busch commented on LUCENE-1879:
---------------------------------------

{quote}
This sounds great! In fact your proposal for a ParallelSegmentWriter
is just like what I'm picturing - making the switching "down low"
instead of "up high" (above Lucene). This'd be more generic than just
the postings files, since all index files can be separately written. 
{quote}

Right.  The goal should it be to be able to use this for updating Lucene internal things (like
norms, column-stride fields), but also giving advanced users APIs, so that they can partition
their data into parallel indexes according to their update requirements (which the current
"above Lucene" approach allows).

{quote}
t'd then a low-level question of whether ParallelSegmentWriter stores
its files in different Directories, or, a single directory with
different file names (or maybe sub-directories within a directory, or,
something else). It could even use FileSwitchDirectory, eg to direct
certain segment files to an SSD (another way to achieve your example).
{quote}

Exactly! We should also keep the distributed indexing use case in mind here. It could make
sense for systems like Katta to not only shard in the document direction.

{quote}
This should also fit well into LUCENE-1458
{quote}

Sounds great!


> Parallel incremental indexing
> -----------------------------
>
>                 Key: LUCENE-1879
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1879
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Index
>            Reporter: Michael Busch
>            Assignee: Michael Busch
>             Fix For: 3.1
>
>         Attachments: parallel_incremental_indexing.tar
>
>
> A new feature that allows building parallel indexes and keeping them in sync on a docID
level, independent of the choice of the MergePolicy/MergeScheduler.
> Find details on the wiki page for this feature:
> http://wiki.apache.org/lucene-java/ParallelIncrementalIndexing 
> Discussion on java-dev:
> http://markmail.org/thread/ql3oxzkob7aqf3jd

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