radosgw multizone not syncing large bucket completly to other zone

[Enrico Kern <enrico.kern@xxxxxxxxxxxxxxx>]

Hello,

We have two ceph luminous clusters (12.2.5).

recently one of our big buckets stopped syncing properly. We have a one specific bucket which is around 30TB in size consisting of alot of directories with each one having files of 10-20MB.

The secondary zone is often completly missing multiple days of data in this bucket, while all other smaller buckets sync just fine.

Even with the complete data missing radosgw-admin sync status always says everything is fine.

the sync error log doesnt show anything for those days. 

Running 

radosgw-admin metadata sync and data sync also doesnt solve the issue. The only way of making it sync again is to disable and re-eanble the sync. That needs to be done as often as like 10 times in an hour to make it sync properly.

radosgw-admin bucket sync disable

radosgw-admin bucket sync enable

when i run data init i sometimes get this:

 radosgw-admin data sync init --source-zone berlin

2018-06-24 07:55:46.337858 7fe7557fa700  0 ERROR: failed to distribute cache for amsterdam.rgw.log:datalog.sync-status.6a9448d2-bdba-4bec-aad6-aba72cd8eac6

Sometimes when really alot of data is missing (yesterday it was more then 1 month) this helps making them get in sync again when run on the secondary zone:

radosgw-admin bucket check --fix --check-objects 

how can i debug that problem further? We have so many requests on the cluster that is is hard to dig something out of the log files..

Given all the smaller buckets are perfectly in sync i suspect some problem because of the size of the bucket.

Any points to the right direction are greatly appreciated.

Regards,

Enrico

--

Enrico Kern

VP IT Operations

enrico.kern@xxxxxxxxxx

+49 (0) 30 555713017 / +49 (0) 152 26814501

skype: flyersa
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