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From "Adrien Grand (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-4792) Smaller doc maps
Date Thu, 21 Feb 2013 20:52:12 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-4792?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Adrien Grand updated LUCENE-4792:
---------------------------------

    Attachment: LUCENE-4792.patch

Patch. I used RamUsageEstimator to estimate the memory savings depending on the ratio of deleted
documents on a segment of 100M docs (deleted docs are randomly chosen):


|| Deletion ratio || Old size || New size ||
| 0.001|214.6 MB|32.2 MB|
| 0.01|250.3 MB|53.7 MB|
| 0.1|298 MB|71.3 MB|
| 0.3|309.9 MB|79.3 MB|
| 0.5|321.9 MB|80.8 MB|
| 0.7|309.9 MB|79.3 MB|
| 0.9|298 MB|71.3 MB|
| 0.99|250.3 MB|53.8 MB|
| 0.999|214.6 MB|32.3 MB|


                
> Smaller doc maps
> ----------------
>
>                 Key: LUCENE-4792
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4792
>             Project: Lucene - Core
>          Issue Type: Improvement
>    Affects Versions: 4.2
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>         Attachments: LUCENE-4792.patch
>
>
> MergeState.DocMap could leverage MonotonicAppendingLongBuffer to save memory.

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