Add serialization support for RAMDirectory
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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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