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From Bing Hua <>
Subject Tlog vs. buffer + softcommit.
Date Thu, 09 Aug 2012 21:39:18 GMT

I'm a bit confused with the purpose of Transaction Logs (Update Logs) in

My understanding is, update request comes in, first the new item is put in
RAM buffer as well as T-Log. After a soft commit happens, the new item
becomes searchable but not hard committed in stable storage. Configuring
soft commit interval to 1 sec achieves NRT.

Then what exactly T-Log is doing in this scenario? Why is it there and under
what circumstances is it being cleared? 

I tried to search for online documentations but no success. Trying to get
something from source code. Any hints would be appreciated.


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