EHC ❯ Using index increased searching time in 4 times

• Type: Bug
• Status: Resolved
• Priority: 2 Major
• Resolution: As Designed
• Component/s: ehcache-core
• Labels:

• Assignee: ljacomet
• Reporter: 01epa
• Created: January 20, 2015
• Votes: 0
• Watchers: 2
• Updated:

  February 11, 2015
• Resolved:

  February 11, 2015

Description

We enabled indexing for search in ehcache accordingly to instruction here http://ehcache.org/documentation/2.8/apis/search

This means that we set allowDynamicIndexing=”true” and added DynamicAttributesExtractor.

But after that we did some tests and checked perfomance. As we found the performance decreased. The search time increased in 4 times.

Debug showed that DynamicAttributesExtractor called not only once (before put or update as said in docs) but also every time during search for every object. It absolutely not clear what is wrong and how DynamicAttributesExtractor may help with quick search if it decreases permfomance.

Comments

Louis Jacomet Jacomet 2015-02-11

This is an unfortunate consequence of search being implemented in a brute force way in OpenSource Ehcache. This means that attributes have to be extracted when search queries run.

The [implementation and performance

http://ehcache.org/documentation/2.8/apis/search#implementation-and-performance] section of the documentation indicates that OpenSource Ehcache has no indexing capabilities.