Hi all, We've just updated to SOLR 4.0 production and Zookeeper 3.3.6 from SOLR 4.0 development version circa November 2011. We keep 6 months of data online in our primary cluster, and archive off old stuff to a slower disk archive cluster. We used to remove SOLR cores with the following code, but everything has changed in Zookeeper now.
Old code to remove cores from Zookeeper: curl http://127.0.0.1:8080/solr/admin/cores?action=UNLOAD&core=${SHARD}<http://127.0.0.1:8080/solr/admin/cores?action=UNLOAD&core=$%7bSHARD%7d> echo "Removing indexes from all Zookeeper hosts" for (( i=0; i<${#ZK_HOSTS[*]}; i++ )) do $JAVA -cp .:/apps/zookeeper-3.3.5/zookeeper-3.3.5.jar:/apps/zookeeper-3.3.5/lib/jline-0.9.94.jar:/apps/zookeeper-3.3.5/lib/log4j-1.2.15.jar org.apache.zookeeper.ZooKeeperMain -server ${ZK_HOSTS[$i]} delete /collections/polecat/shards/solrenglish:8080_solr_$SHARD/$HOSTNAME:8080_solr_$SHARD $JAVA -cp .:/apps/zookeeper-3.3.5/zookeeper-3.3.5.jar:/apps/zookeeper-3.3.5/lib/jline-0.9.94.jar:/apps/zookeeper-3.3.5/lib/log4j-1.2.15.jar org.apache.zookeeper.ZooKeeperMain -server ${ZK_HOSTS[$i]} delete /collections/polecat/shards/solrenglish:8080_solr_$SHARD Done curl http://solrmaster01:8080/solr/admin/cores?action=RELOAD&core=master Now that we have migrated, I have tried removing cores from Zookeeper by removing the stuff for the unloaded core in "leaders" and "leader_elect", but for some reason SOLR keeps sending the requests to the shard, and I end up with the "no servers hosting shard" error. Does anyone know how to remove a SOLR core from a SOLR server and have Zookeeper updated, and have distributed queries still work? The only thing I know how to do now is stop tomcat, stop zookeeper, clear out the data directory and then restart both. This isn't really ideal for a process I'd like to have running each night, and surely it is something others have it. I've tried google searching, and what I find is references to the bug where solr notifies zookeeper on core unloads which is marked as fixed, and people talking about how it doesn't work but if your run reloads on each core, it will work. (also doesn't work when I do it) Regards, Gilles Comeau
