sergey-safarov commented on issue #1125: Very slow replication for some of databases URL: https://github.com/apache/couchdb/issues/1125#issuecomment-360039562 Example of `_active_tasks` output (formated) ``` [ { "node":"[email protected]", "pid":"<0.23837.50>", "changes_pending":76072, "checkpoint_interval":30000, "checkpointed_source_seq":"1-g1AAAAF1eJzLYWBg4MhgTmEQTM4vTc5ISXIwNDLXMwBCwxygFFMiQ5L8____sxIZ8ChKUgCSSfaE1TmA1MWD1GUwJzLmAnnsiWmmhhZpydj04DMpAWRSPUEb81iAJEMDkAIqnU-M2gUQtfuJUXsAovY-MWofQNSC3JsFAGwAZt4", "continuous":false, "database":null, "doc_id":null, "doc_write_failures":0, "docs_read":27, "docs_written":27, "missing_revisions_found":27, "replication_id":"83de18e815b496003e016afaca85d7bc+create_target", "revisions_checked":27, "source":"http://217.12.247.99:5984/account%2f63%2ff8%2f14795fd5b8c74aa04ee865c52f73-201712/";, "source_seq":"527-g1AAAAJjeJyd0L0KwjAQAOBgBV19AFFfQJK2adrJOjmIk7s2f6WUqpOzvom-ib6Jvkm9JB2L0BK4wB33cXcVQmhceApN5OUqCyVS4rMlhkcqKA04ErO6rsvC4-sTJEYS6yCmrK3hDyPmEMWqkQ5W8jVnWJGuUmqkYyMtrMRzSuJcdpUyI90aaWolnBCpVdftzkOI6A4fYA-jbawmIhUKzXtpT6e9jLa3WsIopoHqpb2d9jHazt1MRpFUfi_t6zR7t62bLQ5ZjltnK3-ySqGL", "started_on":1516774642, "target":"http://217.12.247.98:5984/account%2f63%2ff8%2f14795fd5b8c74aa04ee865c52f73-201712/";, "through_seq":"1-g1AAAAF1eJzLYWBg4MhgTmEQTM4vTc5ISXIwNDLXMwBCwxygFFMiQ5L8____sxIZ8ChKUgCSSfaE1TmA1MWD1GUwJzLmAnnsiWmmhhZpydj04DMpAWRSPUEb81iAJEMDkAIqnU-M2gUQtfuJUXsAovY-MWofQNSC3JsFAGwAZt4", "type":"replication", "updated_on":1516776894, "user":null }, { "node":"[email protected]", "pid":"<0.2536.290>", "changes_pending":null, "checkpoint_interval":30000, "checkpointed_source_seq":0, "continuous":false, "database":null, "doc_id":null, "doc_write_failures":0, "docs_read":4, "docs_written":4, "missing_revisions_found":4, "replication_id":"880f88e653a7900c1e7c43461eff471d+create_target", "revisions_checked":4, "source":"http://217.12.247.99:5984/account%2fa4%2f87%2f97afcbf4c1782d55613a5f86b0bf-201712/";, "source_seq":"4-g1AAAAHbeJzLYWBg4MhgTmEQTM4vTc5ISXIwNDLXMwBCwxygFFMiQ5L8____sxIZ8ChKUgCSSfYgdRnMiYy5QB67RXJKinGKITY9-ExyAJkUj2KSobFpslGqGakmJYBMqifo9jwWIMnQAKSASucTo3YBRO1-hAvTzJMtTY2SSHQhxLQDENPuI0xLTTZLM0gjNeQgpj2AmAbycxYAxMp_Nw", "started_on":1516776088, "target":"http://217.12.247.98:5984/account%2fa4%2f87%2f97afcbf4c1782d55613a5f86b0bf-201712/";, "through_seq":"4-g1AAAAHbeJzLYWBg4MhgTmEQTM4vTc5ISXIwNDLXMwBCwxygFFMiQ5L8____sxIZ8ChKUgCSSfYgdRnMiYy5QB67RXJKinGKITY9-ExyAJkUj2KSobFpslGqGakmJYBMqifo9jwWIMnQAKSASucTo3YBRO1-hAvTzJMtTY2SSHQhxLQDENPuI0xLTTZLM0gjNeQgpj2AmAbycxYAxMp_Nw", "type":"replication", "updated_on":1516776089, "user":null }, { "node":"[email protected]", "pid":"<0.29148.294>", "changes_pending":null, "checkpoint_interval":30000, "checkpointed_source_seq":0, "continuous":false, "database":null, "doc_id":null, "doc_write_failures":0, "docs_read":4, "docs_written":4, "missing_revisions_found":4, "replication_id":"1aebc296b560ed25c8153cda8f55069e+create_target", "revisions_checked":4, "source":"http://217.12.247.99:5984/account%2fa4%2f87%2f97afcbf4c1782d55613a5f86b0bf-201710/";, "source_seq":"4-g1AAAAG5eJzLYWBg4MhgTmEQTM4vTc5ISXIwNDLXMwBCwxygFFMiQ5L8____sxIZ8ChKUgCSSfYgdRnMiUy5QB67pYGhYWKiGTY9-ExyAJkUT9jGBJC6eqiNjGAbzSwtUw1SDEm0MY8FSDI0ACmgYfPx2wpRuwCidj_CZsMkI0NLM1OybD4AMe0-MTY_gKgFhU0WAEpFdiQ", "started_on":1516776027, "target":"http://217.12.247.98:5984/account%2fa4%2f87%2f97afcbf4c1782d55613a5f86b0bf-201710/";, "through_seq":"1-g1AAAAF1eJzLYWBg4MhgTmEQTM4vTc5ISXIwNDLXMwBCwxygFFMiQ5L8____sxIZ8ChKUgCSSfYgdRnMiYy5QB67pYGhYWKiGTY9-ExyAJkUT9jGBJC6eoLq8liAJEMDkAIqnU-M2gUQtfuJUXsAovY-MWofQNSC3JsFAMMyZnM", "type":"replication", "updated_on":1516776028, "user":null }, { "node":"[email protected]", "pid":"<0.31083.294>", "changes_pending":null, "checkpoint_interval":30000, "checkpointed_source_seq":0, "continuous":false, "database":null, "doc_id":null, "doc_write_failures":0, "docs_read":4, "docs_written":4, "missing_revisions_found":4, "replication_id":"c125005084bccdfaffc089a2d25cdd43+create_target", "revisions_checked":4, "source":"http://217.12.247.99:5984/account%2fa4%2f87%2f97afcbf4c1782d55613a5f86b0bf-201711/";, "source_seq":"4-g1AAAAGXeJzLYWBg4MhgTmEQTM4vTc5ISXIwNDLXMwBCwxygFFMiQ5L8____szKYE5lygQLsSSmWJoYWKdg04DEmSQFIJtmjmGRoamCSaG5AqkkOIJPiQSYlMuBTlwBSV09QXR4LkGRoAFJApfOJUbsAonY_MWoPQNTeJ0btA4hakHuzABv8bmY", "started_on":1516776055, "target":"http://217.12.247.98:5984/account%2fa4%2f87%2f97afcbf4c1782d55613a5f86b0bf-201711/";, "through_seq":"1-g1AAAAF1eJzLYWBg4MhgTmEQTM4vTc5ISXIwNDLXMwBCwxygFFMiQ5L8____sxIZ8ChKUgCSSfYgdRnMiYy5QB67oamBSaK5ATY9-ExyAJkUT9jGBJC6eoLq8liAJEMDkAIqnU-M2gUQtfuJUXsAovY-MWofQNSC3JsFAI3AZkI", "type":"replication", "updated_on":1516776057, "user":null }, { "node":"[email protected]", "pid":"<0.32724.392>", "changes_pending":null, "checkpoint_interval":30000, "checkpointed_source_seq":0, "continuous":false, "database":null, "doc_id":null, "doc_write_failures":0, "docs_read":0, "docs_written":0, "missing_revisions_found":0, "replication_id":"7a796b343b45bb41d6cb9a76e6f9e675+create_target", "revisions_checked":0, "source":"http://217.12.247.99:5984/account%2fc3%2f43%2f646ab95638f945c8ec895263cf2e-201707/";, "source_seq":0, "started_on":1516776898, "target":"http://217.12.247.98:5984/account%2fc3%2f43%2f646ab95638f945c8ec895263cf2e-201707/";, "type":"replication", "updated_on":1516776898, "user":null }, { "node":"[email protected]", "pid":"<0.7273.48>", "changes_pending":null, "checkpoint_interval":30000, "checkpointed_source_seq":0, "continuous":false, "database":null, "doc_id":null, "doc_write_failures":0, "docs_read":8, "docs_written":8, "missing_revisions_found":8, "replication_id":"260c79c446f46814cdf361b5d02b59ce+create_target", "revisions_checked":8, "source":"http://217.12.247.99:5984/account%2f63%2ff8%2f14795fd5b8c74aa04ee865c52f73-201711/";, "source_seq":"1041-g1AAAAJjeJyd0LsNwjAQBmCLIEHLBDABivOyXZEdGABsn60oBKhoKICahhFgE1gEwSbBj5QRUqKT_pPudF9xFUJoXASAJnJ_kAWIHEdkHprClVkNOBLTuq7LIuBqawYjpkKuCGs7-MOImUmxaKSTkwSVOo1oVym30qqRjk4CAlpy6CqtrXRupKuXFERSdJV2Q5PoYprB7la7OY2zBHSGe2kPrz2t9vb_yqiMdT_t5bWP1ZZOIxR4Eqte2tdr7m8bp2nMaJSKtrvyB9O6pI8", "started_on":1516774615, "target":"http://217.12.247.98:5984/account%2f63%2ff8%2f14795fd5b8c74aa04ee865c52f73-201711/";, "through_seq":"3-g1AAAAGXeJzLYWBg4MhgTmEQTM4vTc5ISXIwNDLXMwBCwxygFFMiQ5L8____sxIZ8ChKUgCSSfaE1TmA1MUTVpcAUlcPUpfBnMiYC-Sxp6SmGCUnpWDTg8ekPBYgydAApICGzcdvK0TtAoja_cSoPQBRex_kSiawK80tUhJNjFPJcuUDiGmgsMkCAN8Hb1s", "type":"replication", "updated_on":1516774616, "user":null } ] ``` Replication to database `account%2f63%2ff8%2f14795fd5b8c74aa04ee865c52f73-201711` is now acrive about 1 hour, but processes only 8 doc.
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