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  1. Couchbase Server
  2. MB-36442

Drop in cbbackupmgr backup throughput in MH build 6.5.0-4449

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    Description

      cbbackupmgr backup throughput is degraded in 6.5.0-4449  .

      It appears to be due to one of the below memory related changes .

      changed projects : kv_engine changed from 3e816d39c162d94ba643f14437af1fca697d17df to master

      [+] 510acc6 Prepare Command Contexts for OoO [2/n]

      [+] 8cdb2ce Update uses of AtomicDuration to new template platform changed from d2114be8ae6c40e72f890493cd4f3ead376d57a2 to master

      [+] f42ec1e Allow memory order of AtomicDuration to be specified

       

      replica doc comparison between two tests :

       

      http://cbmonitor.sc.couchbase.com/reports/html/?snapshot=leto_650-4449_backup_11da&label=4449&snapshot=leto_650-4448_backup_f42a&label=4448

       

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            This seems to be the root cause for memcahced RSS memory degradation 

            http://showfast.sc.couchbase.com/#/timeline/Linux/kv/memory/all

             

            sharath.sulochana Sharath Sulochana (Inactive) added a comment -   This seems to be the root cause for memcahced RSS memory degradation  http://showfast.sc.couchbase.com/#/timeline/Linux/kv/memory/all  

            Dave Rigby - I was not sure who should I direct this ticket . Appreciate if you could assign it to right person .

            sharath.sulochana Sharath Sulochana (Inactive) added a comment - Dave Rigby  - I was not sure who should I direct this ticket . Appreciate if you could assign it to right person .
            owend Daniel Owen added a comment -

            Hey Patrick Varley Could you take a look at this?

            thanks

            owend Daniel Owen added a comment - Hey Patrick Varley Could you take a look at this? thanks

            The root cause was that documents in Couchbase Server was no longer being compressed, and as a result more data was being transferred by cbbackupmgr.

            This was caused by http://review.couchbase.org/#/c/115567/, basically memcached was incorrectly storing the documents uncompressed that change was then reverted in MB-36413.

            pvarley Patrick Varley added a comment - The root cause was that documents in Couchbase Server was no longer being compressed, and as a result more data was being transferred by cbbackupmgr. This was caused by http://review.couchbase.org/#/c/115567/ , basically memcached was incorrectly storing the documents uncompressed that change was then reverted in MB-36413 .

            Closing as a duplicate of MB-36413.

            pvarley Patrick Varley added a comment - Closing as a duplicate of MB-36413 .

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              pvarley Patrick Varley
              sharath.sulochana Sharath Sulochana (Inactive)
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