We faced the same issue. If you are executing a complete clean build, the Slave copies the complete index and just switches the pointer in the index.properties to point to the new index.xxxx directory, leaving behind the old copies. And it does not clean it up.
Had logged an JIRA and patch to SnapPuller class, you may want to give it a try - https://issues.apache.org/jira/browse/SOLR-2156 Regards, Jayendra 2010/10/26 Chengyang <atreey...@163.com> > I noticed that the slave node have some tmp Index.xxxxx dir that created > during the index sync with master, but they are not removed even after > serval days. So when will solr del the tmp index dir? >
