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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2759) We should never open an IndexInput when an IndexOutput is still open
Date Sun, 14 Nov 2010 23:30:15 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12931921#action_12931921
] 

Michael McCandless commented on LUCENE-2759:
--------------------------------------------

bq. RT's usage of doc stores, ie, reading from them while they're still being written to will
likely break this.

True, we need to cross that bridge w/ RT.

Actually I think Michael & I discussed it already on an issue but I can't remember where.

> We should never open an IndexInput when an IndexOutput is still open
> --------------------------------------------------------------------
>
>                 Key: LUCENE-2759
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2759
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 2.9.4, 3.0.3, 3.1, 4.0
>
>         Attachments: LUCENE-2759.patch
>
>
> I modified MockDirWrapper to assert this (except for
> segments_N/segments.gen, where it's expected), and, it uncovered a
> couple of places involving NRT readers where we open a shared doc
> store file that's still open for writing.
> First, if you install a merged segment warmer, we were failing to
> force the merge of the doc stores in this case, thus potentially
> opening the same doc stores that are also still open for writing.
> Second, if you're actively adding docs in other threads when you call
> IW.getReader(), the other threads could sneak in and flush new
> segments sharing the doc stores.  The returned reader then opens the
> doc store files that are still open for writing.

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