Baloo/XapianProblems: Difference between revisions
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=== Problems with Xapian === | === Problems with Xapian === | ||
* It heavily relies on exceptions. Exceptions are not well supported in Qt and might make the application crash as mentioned [http://qt-project.org/doc/qt-5/exceptionsafety.html here]. For example while locking a database Xapian expects the program to catch | * It heavily relies on exceptions. Exceptions are not well supported in Qt and might make the application crash as mentioned [http://qt-project.org/doc/qt-5/exceptionsafety.html here]. For example while locking a database Xapian expects the program to catch certain exceptions and retry if they are caught. | ||
*If we want to read and write to an Xapian database simultaneously we need to keep separate copies for reading and writing, thus wasting memory. | *If we want to read and write to an Xapian database simultaneously we need to keep separate copies for reading and writing, thus wasting memory. | ||
Revision as of 14:03, 29 November 2014
Problems with Xapian
- It heavily relies on exceptions. Exceptions are not well supported in Qt and might make the application crash as mentioned here. For example while locking a database Xapian expects the program to catch certain exceptions and retry if they are caught.
- If we want to read and write to an Xapian database simultaneously we need to keep separate copies for reading and writing, thus wasting memory.
- It does not handle data that is changing frequently, if data in document changes to frequently it can lead to a conditions in which locking the database for writing becomes impossible thus making baloo fail.
- Baloo needs support for normalizing text i.e. removing all diacritic marks and also needs to split words with '_' to generate terms, Xapian's term generator doesn't provide support for either. So baloo uses its own term generator.
- While searching for something the user may not type complete words so we need to look for every possible expansion of the words in a query, xapian doesn't provide this feature so we're using our own query parser.