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From "Michael Busch (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-743) IndexReader.reopen()
Date Fri, 05 Oct 2007 07:42:51 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12532585
] 

Michael Busch commented on LUCENE-743:
--------------------------------------

I ran new performance tests with the latest patch similar to the tests I explained in an earlier
comment on this issue.

I'm using again a 4.5M index. In each round I delete one document and (re)open the IndexReader
thereafter. Here are the numbers for 5000 rounds:

|| || Time || Speedup ||
| open |  703s | |
| reopen(closeOldReader==false) | 62s | 11x |
| reopen(closeOldReader==true) |16s | 44x |

Now in each round I delete on document and also set the norm for one random document. Numbers
for 1000 rounds:

|| || Time || Speedup ||
| open |  166s | |
| reopen(closeOldReader==false) | 33s | 5.0x |
| reopen(closeOldReader==true) | 29s | 5.7x |

I think these numbers look pretty good. We get a quite decent speedup even if the old readers
are not closed.

I would like to commit this in a couple of days to get ready for Lucene 2.3. It would be nice
if someone could review the latest patch! Hoss? Others?

> IndexReader.reopen()
> --------------------
>
>                 Key: LUCENE-743
>                 URL: https://issues.apache.org/jira/browse/LUCENE-743
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Otis Gospodnetic
>            Assignee: Michael Busch
>            Priority: Minor
>             Fix For: 2.3
>
>         Attachments: IndexReaderUtils.java, lucene-743-take2.patch, lucene-743.patch,
lucene-743.patch, lucene-743.patch, MyMultiReader.java, MySegmentReader.java
>
>
> This is Robert Engels' implementation of IndexReader.reopen() functionality, as a set
of 3 new classes (this was easier for him to implement, but should probably be folded into
the core, if this looks good).

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