[jira] [Created] (COUCHDB-3304) Rollback default value of config global_change:max_write_delay to 500

["Bala Kolla (JIRA)" <ji...@apache.org>]

Bala Kolla created COUCHDB-3304:
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             Summary: Rollback default value of config global_change:max_write_delay to 500
                 Key: COUCHDB-3304
                 URL: https://issues.apache.org/jira/browse/COUCHDB-3304
             Project: CouchDB
          Issue Type: Bug
          Components: Database Core
            Reporter: Bala Kolla


This config default value has changed from 500 to 25 and it's causing a noticeable impact on the performance. We executed a performance test benchmark to simulate the load test of put_insert (create) scenario. The summary of the results is shown here.

As evident in the performance test results shown below, there is improvement across the board. Throughput improved by around 10%, p99 is improved by around 20% and similar gains in other latency metrics.

A0 ==> Default config of 25
A1 ==> 500.0
 
 	                                    bench_result	p90	          p99	p999
global_changes-max_write_delay	 	 	 	 	 	 
A0	                                            363874	83485.6	115756	176128
A1	                                            403827	63356.4	84457.6	102221




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