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  1. Couchbase Server
  2. MB-46062

Expiry Load: Index total ram and disk usage is oscillating between certain values while there is no mutation left from KV.

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      Steps:
      1. Start an expiry load with ttl=1000s
      2. Create few indexes. Let the KV load complete
      3. Wait for index mutations to finish.
      4. Wait for index purger to run as in the disk size start reducing to min.
      5. After some time the disk usage and ram used started increasing.
      6. It reduces again and this follows.

      See the screenshot for index total ram:

      Disk usage by indexes on .67, .68:

      172.23.110.67

      [root@cen-sd10 ~]# du -cm /data/ | tail -1
      8022	total
      [root@cen-sd10 ~]# du -cm /data/ | tail -1
      8022	total
      [root@cen-sd10 ~]# du -cm /data/ | tail -1
      4652	total
      [root@cen-sd10 ~]# du -cm /data/ | tail -1
      4652	total
      [root@cen-sd10 ~]# du -cm /data/ | tail -1
      8801	total
      [root@cen-sd10 ~]# du -cm /data/ | tail -1
      8409	total
      [root@cen-sd10 ~]# du -cm /data/ | tail -1
      8409	total
      

      172.23.110.68

      [root@cen-sd09 ~]# du -cm /data/ | tail -1
      19396	total
      [root@cen-sd09 ~]# du -cm /data/ | tail -1
      19396	total
      [root@cen-sd09 ~]# du -cm /data/ | tail -1
      21726	total
      [root@cen-sd09 ~]# du -cm /data/ | tail -1
      20702	total
      [root@cen-sd09 ~]# du -cm /data/ | tail -1
      24714	total
      [root@cen-sd09 ~]# 
      [root@cen-sd09 ~]# du -cm /data/ | tail -1
      20863	total
      [root@cen-sd09 ~]# du -cm /data/ | tail -1
      19976	total
      

      The difference between the low and the high value is nearly 3GB for instance with idx18

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            jliang John Liang
            ritesh.agarwal Ritesh Agarwal
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            Dates

              Created:
              Updated:

              Gerrit Reviews

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                PagerDuty