On Fri, 8 Jul 2022 at 22:04, Robert Newson <rnew...@apache.org> wrote:
> Hi, > > The config file isn't monitored, so just changing the file won't help, > you'd need to restart couchdb. I did not change the config file, used the config API instead and checked that the files were changed afyerwards. Did you have anything bypassed in the first place, though? Yes: - os_process -read - write - view_update Could you explain the replication problems you encountered? A few of these: [error] 2022-04-27T00:14:26.027209Z couc...@couchdb-310-couchdb-2.couchdb-310-couchdb.couchdb.svc.cluster.local <0.28525.7700> 734f3d6415 req_err(50502807) unknown_error : normal [<<"chttpd:catch_error/3 L358">>,<<"chttpd:handle_req_after_auth/2 L324">>,<<"chttpd:process_request/1 L305">>,<<"chttpd:handle_request_int/1 L243">>,<<"mochiweb_http:headers/6 L150">>,<<"proc_lib:init_p_do_apply/3 L247">>] In addition to this, the source cluster was constantly compacting views and shards, even when there wwere no transactions. I can say for sure that it is generally unsafe to modify shard files > out-of-band while couchdb is running, as it appears you did at step 5. > Couchdb may well have opened the shard files (created at step 3) and it > holds them open in a cache. > The renaming of files to match the database-id happened on a shared volume that was not used by either cluster, only after setting the target cluster to maintenance mode I copied the shard files. > I don't think we have written up how to do this properly (we strongly > advise replication instead) but I did write an SO post a while ago: > https://stackoverflow.com/questions/6676972/moving-a-shard-from-one-bigcouch-server-to-another-for-balancing. > The sharing scheme for bigcouch is the same as for couchdb 3.x. > > The essential difference is to _not_ create the clustered database at the > target cluster until _after_ you've copied the shard files over. You then > create the '_dbs' doc yourself. (Note that in big couch this database was > called "dbs"). I based my procedure on the CouchDB doc (4.4.3. Moving a shard). Cheers, Luca Morandini
