[GitHub] [couchdb] niconorsk opened a new issue #2073: CouchDB 2.0: Race condition when creating/deleting database

[GitBox <gi...@apache.org>]

niconorsk opened a new issue #2073: CouchDB 2.0: Race condition when creating/deleting database
URL: https://github.com/apache/couchdb/issues/2073
 
 
   Reposting of https://issues.apache.org/jira/browse/COUCHDB-3034 as this is still an issue
   
   ## Description
   
   I've noticed that CouchDB 2.0 (master) occasionally returns 500 errors when multiple clients attempt to PUT or DELETE the same database concurrently. 
   
   ## Steps to Reproduce
   
   This is reproducible by running multiple instances of following script in parallel against an n=1 (single node) cluster:
   ```
   #!/bin/bash
   
   for i in `seq 1 2000`;
   do
   	printf '\nPUT: '
       curl -XPUT 'http://localhost:15984/testdb' -w "%{http_code}\\n"
       printf '\nDELETE: '
       curl -XDELETE 'http://localhost:15984/testdb' -w "%{http_code}\\n"
   done
   ```
   This generates output along the lines of:
   ```
   PUT: {"ok":true}
   201
   
   DELETE: {"ok":true}
   200
   
   PUT: {"error":"error","reason":"internal_server_error"}
   500
   
   DELETE: {"error":"not_found","reason":"Database does not exist."}
   404
   
   PUT: {"error":"file_exists","reason":"The database could not be created, the file already exists."}
   412
   
   DELETE: {"ok":true}
   200
   
   PUT: {"error":"file_exists","reason":"The database could not be created, the file already exists."}
   412
   
   DELETE: {"ok":true}
   200
   
   PUT: {"ok":true}
   201
   
   DELETE: {"ok":true}
   200
   ```
   ## Your Environment
   
   * CouchDB Version used: 2.3.1 installed from RPM
   * Browser name and version: curl
   * Operating System and version: CentOS 7.5
   
   

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