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Dear All
We have the same question here, if anyone can help ... Thank you!
Cheers Francois From: ceph-users on behalf of P. O. <posdub@xxxxxxxxx>
Sent: Friday, August 9, 2019 11:05 AM To: ceph-users@xxxxxxxxxxxxxx Subject: [ceph-users] Multisite RGW - Large omap objects related with bilogs Hi all,
<< ATT00001.txt (0.4KB) (0.4KB) >>I have two ceph clusters in RGW multisite environment, with ~1500 bucketes ( 500M objects, 70TB ). Some of the buckets are very dynamic (objects are constantly changing). I have problems with large omap objects in bucket indexes, related with "dynamic buckets". For example: [root@rgw ~]# radosgw-admin bucket stats --bucket bucket_s3d33 |grep num_objects "num_objects": 564 In /var/log/ceph/ceph.log: cluster [WRN] Large omap object found. Object: 10:297646ca:::.dir.86a05ec8-9982-429b-9f94-28363610a95c.12546d0.17892:head Key count: 5307523 Size (bytes): 748792509 I found, this is because of bucket index logs: [root@rgw-1 ~]# rados -p default.rgw.buckets.index listomapkeys .dir.86a05ec8-9982-429b-9f94-28363610a95c.12546d0.17892 | wc -l 5307523 There are a lot of keys: �0_00013758656.71188336.4 �0_00013758657.71188337.5 �0_00013758658.71188338.4 �0_00013758659.71188339.5 �0_00013758660.71188342.4 �0_00013758661.71188343.5 �0_00013758662.71188344.4 [root@rgw-1 ~]# radosgw-admin bilog list --bucket bucket_s3d33 --max-entries 6000000 |grep op_id | wc -l 5307523 I have configured parameters in my ceph.conf: rgw sync log trim concurrent buckets = 32 rgw sync log trim max buckets = 64 rgw sync log trim interval = 1200 rgw sync log trim min cold buckets = 4 But from two weeks, the omap key count is still growing. How can I safely clean these bilogs (with no bucket damage and no replication damage)? I found two radosgw-admin parameters related with bilogs trimming: 1) radosgw-admin bilog trim --bucket=bucket_s3d33 --start-marker XXXX --end-marker YYYY I dont know what values should be in: --start-marker XXXX --end-marker YYYY. Is it safe to use "bilog trim" on bucket with replication in progress? If yes, should i run this on both sites? 2) radosgw-admin bilog autotrim Is this command safe? Can I use autotrim on selected bucket? Maybe there is some other way, to delete bilogs? Best regards, P.O. |
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