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https://issues.apache.org/jira/browse/LUCENE-1076?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shai Erera updated LUCENE-1076:
-------------------------------
Attachment: LUCENE-1076-3x.patch
Patch against 3x. This is not ready to commit yet, as many tests fail on
exceptions like this:
{noformat}
[junit] java.lang.IndexOutOfBoundsException
[junit] at java.util.AbstractList.subList(AbstractList.java:763)
[junit] at java.util.Vector.subList(Vector.java:975)
[junit] at
org.apache.lucene.index.IndexWriter.commitMerge(IndexWriter.java:3550)
[junit] at
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4057)
[junit] at
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:3631)
{noformat}
Mike says there was an earlier commit (handled how deletes are flushed) that
is a dependency of that, and that I can continue only he back-ports that.
In the meantime, I've fixed tests that assumed LogMP (for setting compound and
mergeFactor) by adding LTC.setUseCompoundFile and LTC.setMergeFactor as utility
methods.
Will continue after Mike back-ports the dependencies.
> Allow MergePolicy to select non-contiguous merges
> -------------------------------------------------
>
> Key: LUCENE-1076
> URL: https://issues.apache.org/jira/browse/LUCENE-1076
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.3
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 3.2, 4.0
>
> Attachments: LUCENE-1076-3x.patch, LUCENE-1076.patch,
> LUCENE-1076.patch, LUCENE-1076.patch
>
>
> I started work on this but with LUCENE-1044 I won't make much progress
> on it for a while, so I want to checkpoint my current state/patch.
> For backwards compatibility we must leave the default MergePolicy as
> selecting contiguous merges. This is necessary because some
> applications rely on "temporal monotonicity" of doc IDs, which means
> even though merges can re-number documents, the renumbering will
> always reflect the order in which the documents were added to the
> index.
> Still, for those apps that do not rely on this, we should offer a
> MergePolicy that is free to select the best merges regardless of
> whether they are continuguous. This requires fixing IndexWriter to
> accept such a merge, and, fixing LogMergePolicy to optionally allow
> it the freedom to do so.
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