On 5/26/2017 2:20 AM, mganeshs wrote: > I am planning the following for moving my old solr index data created in > 4.10 to new solr server with 6.5.1. Let me know whether it will work out or > not. > > * Setup Solr and Collections with version 5.5 > * Copy data folder ( in old solr server 4.10 ) to the corresponding > collection's data folder > * Optmize the collection > * Now setup new solr and collections with version 6.5.1 > * Copy the data folder of corresponding collections in 5.5 server ( which > got optmised ) to data folder in 6.5.1 server
The fact that you're using "collection" to describe this suggests that you're running in cloud mode. If you are, and the collections are sharded with the compositeId router, then you must be very careful to make sure that the hash ranges match. Bad things will start to happen with indexing if they don't match. If you're not running cloud, or have indexes with only one shard, then you're good to go. You may find that you need to manually edit hash ranges in zookeeper and restart all the new Solr instances. Generally speaking, if you upgrade to 5.5 and optimize like you're describing, everything will work. By using the IndexUpgrader from a Solr 5.5.4 download, you could upgrade the index to a format that 6.5.1 can read, and skip the intermediate upgrade. The statement about hash ranges would still apply, though. https://cwiki.apache.org/confluence/display/solr/IndexUpgrader+Tool I am assuming here that your 4.10 servers are using a schema that is compatible with 6.5.1 without change. If you have to change the schema, chances are goood that you're going to have to completely reindex anyway. Thanks, Shawn
