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Posted to user@couchdb.apache.org by Carlos Alonso <ca...@cabify.com> on 2017/10/01 09:42:28 UTC

Trying to understand why a node gets 'frozen'

Hello everyone!!

I'm trying to understand an issue we're experiencing on CouchDB 2.1.0
running on Ubuntu 14.04. The cluster itself is currently replicating from
another source cluster and we have seen that one node gets frozen from time
to time having to restart it to get it to respond again.

Before getting unresponsive, the node throws a lot of {error,
sel_conn_closed}. See an example trace below.

[error] 2017-10-01T05:25:23.921126Z couchdb@couchdb-1 <0.13489.0> --------
gen_server <0.13489.0> terminated with reason:
{checkpoint_commit_failure,<<"Failure on target commit:
{'EXIT',{http_request_failed,\"POST\",\n                             \"
http://127.0.0.1:5984/mydb/_ensure_full_commit\",\n
     {error,sel_conn_closed}}}">>}
  last msg: {'EXIT',<0.10626.0>,{checkpoint_commit_failure,<<"Failure on
target commit: {'EXIT',{http_request_failed,\"POST\",\n
         \"http://127.0.0.1:5984/mydb/_ensure_full_commit\",\n
               {error,sel_conn_closed}}}">>}}
     state: {state,<0.10626.0>,<0.13490.0>,20,{httpdb,"
https://source_ip/mydb/",nil,[{"Accept","application/json"},{"Authorization","Basic
..."},{"User-Agent","CouchDB-Replicator/2.1.0"}],30000,[{is_ssl,true},{socket_options,[{keepalive,true},{nodelay,false}]},{ssl_options,[{depth,3},{verify,verify_none}]}],10,250,<0.11931.0>,20,nil,undefined},{httpdb,"
http://127.0.0.1:5984/mydb/",nil,[{"Accept","application/json"},{"Authorization","Basic
..."},{"User-Agent","CouchDB-Replicator/2.1.0"}],30000,[{socket_options,[{keepalive,true},{nodelay,false}]}],10,250,<0.11995.0>,20,nil,undefined},[],<0.25756.4748>,nil,{<0.13490.0>,#Ref<0.0.724041731.98305>},[{docs_read,1},{missing_checked,1},{missing_found,1}],nil,nil,{batch,[<<"{\"_id\":\"df84bfda818ea150b249da89e8d79a38\",\"_rev\":\"1-ebb0119fbdcad604ad372fa6e05d06a2\",...\":{\"start\":1,\"ids\":[\"ebb0119fbdcad604ad372fa6e05d06a2\"]}}">>],605}}

The particular node is 'responsible' for a replication that has quite many
{mp_parser_died,noproc} errors, which AFAIK is a known bug (
https://github.com/apache/couchdb/issues/745), but I don't know if that may
have any relationship.

When that happens, just restarting the node brings it up and running
properly.

Any help would be really appreciated.

Regards
-- 
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*Carlos Alonso*
Data Engineer
Madrid, Spain

carlos.alonso@cabify.com

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