hi , The current replication strategy in solr involves shell scripts . The following are the drawbacks * It does not work with windows * Replication works as a separate piece not integrated with solr. * Cannot control replication from solr admin/JMX * Each operation requires manual telnet to the host
Doing the replication within java code has the following advantages * Platform independence * Manual steps can be completely eliminated. Everything can be driven from solrconfig.xml . ** Just put in the url of the master in the slaves that should be good enough to enable replication. Other things like frequency of snapshoot/snappull can also be configured * Start/stop can be triggered from solr/admin or JMX * Can get the status/progress while replication is going on * No need to have a login into the machine The implementation can be done as two components * A SolrEventListener which does a snapshoot . Same as done by the script * A ReplicationHandler which can act as a server to dish out the index snapshots (in the master) ** In the slave the same handler can poll at regular intervals and if there is a new snapshot fetch the index over http (it can use solrj+BinaryReponseWriter) * The same Handler can do a snap install * The Handler may expose all the operations over a REST interface or JMX * It may also show the current state of the master index through the console What do you think? -- --Noble Paul
