I'm using Compass 2.2.0/Lucene 2.4.1 and I've specified the following in a XML Schema based configuration (using Compass::Spring):
<compass:transaction processor="read_committed" />
However, when checking the log4j debug level logging the following is observed:
DEBUG main: (DefaultLuceneQueryParser.java:76) - Query Parser configured with allowLeadingWildcard true and allowConstantScorePrefixQuery true
DEBUG main: (AsyncTransactionProcessorFactory.java:133) - Async Transaction Processor will wait for 10000ms if backlog is full
DEBUG main: (AsyncTransactionProcessorFactory.java:139) - Async Transaction Processor blocking batch size is  with timeout of 100ms
DEBUG main: (AsyncTransactionProcessorFactory.java:144) - Async Transaction Processor non blocking batch size is 
DEBUG main: (AsyncTransactionProcessorFactory.java:149) - Async Transaction Processor process before close is set to true
DEBUG main: (AsyncTransactionProcessorFactory.java:154) - Async Transaction Processor will use  concrrent threads to process transactions
DEBUG main: (AsyncTransactionProcessorFactory.java:159) - Async Transaction Processor uses UID based hashing for concurrent processing
DEBUG main: (AsyncTransactionProcessorFactory.java:163) - Starting Async polling transaction processor
DEBUG main: (TransactionFactoryFactory.java:35) - Using transaction factory org.compass.core.transaction.LocalTransactionFactory@11978b
DEBUG main: (FirstLevelCacheFactory.java:56) - Using first level cache http://org.compass.core.cache.first.NullFirstLevelCache
The RecommittedTransactionProcessorFactory never seems to be used.
With the following compass.cfg.xml:
I see now. The debug logging is just there since the Async transaction processor gets initialized even with default configuration. This allows to easily choose a specific session to be processed by it (just by setting it on the session settings).
If you use read committed, you should see read committed logs when you perform operations, and not async ones.
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