In addition to what Emir mentioned, when Solr opens a new Transaction Log
file it will delete the older ones up to some conditions :
keep at least N number of records [1] and max K number of files[2].
N is specified in the solrconfig.xml ( in the update handler section) and
can be documents related or files related or both.
So , potentially it could delete no one.
This blog from Erick is quite explicative[3] .
If you like to take a look to the code, this class should help[4]
[1] <str name="numRecordsToKeep">${solr.ulog.numRecordsToKeep:100}</str>
[2] <str name="maxNumLogsToKeep">${solr.ulog.maxNumLogsToKeep:10}</str>
[3]
https://lucidworks.com/2013/08/23/understanding-transaction-logs-softcommit-and-commit-in-sorlcloud/
[4] org.apache.solr.update.UpdateLog
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Alessandro Benedetti
Search Consultant, R&D Software Engineer, Director
Sease Ltd. - www.sease.io
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Sent from: http://lucene.472066.n3.nabble.com/Solr-User-f472068.html
