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From "John Wang (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-3516) Add serialization support for RAMDirectory
Date Thu, 13 Oct 2011 17:59:14 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-3516?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

John Wang updated LUCENE-3516:
------------------------------

    Attachment: RAMDirectorySerializer.java
    
> Add serialization support for RAMDirectory
> ------------------------------------------
>
>                 Key: LUCENE-3516
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3516
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: core/store
>    Affects Versions: 3.4
>            Reporter: John Wang
>         Attachments: RAMDirectorySerializer.java
>
>
> We are building Lucene indexes via Hadoop, and using byte[] for of RAMDirectory as intermediate
storage. (we are using Hadoop's indexing contrib package)
> Currently Java serialization is used, and seemed wasteful and not portable across languages.
> Since RAMDirectory essentially is a collection of byte[], writing a serializer seemed
easy.
> Attached please find a utility class that does such. This includes a light performance
comparison test comparing the java serialization:
> Results: (input, number of files and avg file size, output, size percentage: our ser/java
ser, time, serialization: percentage, our ser/java ser, deserialization: percentage, our ser/java
ser
> test 1:(3, 1k)
> size: 66.93%
> ser time: 1.89%
> deser time: 4.48%
> test 2: (100,100)
> size: 95.16%
> ser time: 4.01%
> deser time: 13.36%
> test 3: (3,50k)
> size: 98.42%
> ser time: 3.09%
> deser time: 8.10%
> test 4: (1,1k)
> size: 41.70%
> ser time: 1.85%
> dser time: 3.85%
> The implementation is very elementary, yet still much better than java ser. Esp on the
time (avg 50x faster)

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