I have migrated the search workflows in my application from Lucene to Compass. Since we have some backend jobs which are continuosly updating the data in the lucene index, we are caching the lucene IndexSearcher object and refresh it every hour.
Now with compass, I am using CompassSearchHelper to query the compass index. Does Compass internally cache the lucene IndexSearcher object? If yes, how can I periodically refresh it in compass?
Compass takes care of that for you. It will check the index periodically and if the index changes, it will invalidate the reader/searcher opened against it. You can control the timings using different Compass settings (explained in the docs in the settings section).
I could not find the information in the docs to control the Searcher refresh. I did find how to control the index optimization using compass.engine.optimizer.schedule and compass.engine.optimizer.schedule.period.
Can you please point me to the settings for refresh?
Should the cache be cleared on commit. Note, that setting it to false might mean that the transaction isolation level will not function properly (for example, with read_committed, it will mean that data that is committed will take time to be reflected in the index). Defaults to true.
Sets how often (in milliseconds) the index manager will check if the index cache needs to be invalidated. Defaults to 5000 milliseconds. Setting it to 0 means that the cache will check if it needs to be invalidated all the time. Setting it to -1 means that the cache will not check the index for invalidation, it is perfectly fine if a single instance is working with the index, since the cache is automatically invalidated upon a dirty operation.
That was very helpful. I have a couple of related questions.
I have 2 applications, one is user facing and the other is the backend application that adds data in to the system periodically. They are 2 different jvms deployed on the same server.
1. Refresh the searcher on the user-facing app
2. Optimize the index from the backend app
I can use the configurations mentioned by you to refresh and optimize. But I was wondering if the refresh searcher gets triggered while optimize is running on the index, it might run in to some issues?
It will. The refresh process checks the index version, and if has changed, it will refresh the searcher. The optimize process will cause the index version to increase, which will cause the searcher to be refreshed (within the time limit of the cache invalidation).
Yes it does refresh the searcher as mentioned by you. But occassionally, I am unable to find/search for an executive, who has been added to the compass index. I am still not exactly sure of the pattern.
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