[jira] Commented: (LUCENE-2558) Use sequence ids for deleted docs

["Jason Rutherglen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-2558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12913400#action_12913400 ] 

Jason Rutherglen commented on LUCENE-2558:
------------------------------------------

For the deleted docs sequence id array, perhaps I'm a little bit
confused, but how will we signify in the sequence id array if a
document is deleted? I believe we need a secondary sequence id
array for deleted docs that is init'd to -1. When a document is
deleted, the sequence id is set for that doc in the
del-docs-seq-arr. When the deleted docs Bits is being accessed,
for a given doc, we'll compare the IRs seq-id-up-to with the
del-docs-seq-id, and if the IR seq-id is greater than or equal
to, the Bits.get method will return true, meaning the document
is deleted. 

I am forgetting how concurrency will work in this case, ie,
insuring multi-threaded visibility due to the JMM. Actually,
because we're pausing the writes/deletes when get reader is
called on the DWPT, JMM concurrency should be OK.

> Use sequence ids for deleted docs
> ---------------------------------
>
>                 Key: LUCENE-2558
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2558
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>    Affects Versions: Realtime Branch
>            Reporter: Jason Rutherglen
>            Priority: Minor
>             Fix For: Realtime Branch
>
>
> Utilizing the sequence ids created via the update document
> methods, we will enable IndexReader deleted docs over a sequence
> id array. 
> One of the decisions is what primitive type to use. We can start
> off with an int[], then possibly move to a short[] (for lower
> memory consumption) that wraps around.

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