Invalid Object map without flags set

[Glen Baars <glen@xxxxxxxxxxxxxxxxxxxxxx>]

Hello Ceph Users,

 

We are having issues with ensuring that object-map and fast-diff is working correctly. Most of the time when there is an invalid fast-diff map, the flag is set to correctly indicate this. We have a script that checks for this and rebuilds object maps as required. If we don’t fix these, snapshot removal and rbd usage commands are too slow.

 

About 10% of the time when we issue an `rbd du` command we get the following situation.

 

warning: fast-diff map is invalid for 2d6b4502-f720-4c00-b4a4-8879e415f283@18-D-2018-07-11:1109. operation may be slow.

 

When we check the `rbd info` it doesn’t have any flags set.

 

[INFO]    {"name":"2d6b4502-f720-4c00-b4a4-8879e415f283","size":536870912000,"objects":128000,"order":22,"object_size":4194304,"block_name_prefix":"rbd_data.17928643c9869","format":2,"features":["layering","exclusive-lock","object-map","fast-diff","deep-flatten"],"flags":[],"create_timestamp":"Sat Apr 28 19:45:59 2018"}
[Feat]    ["layering","exclusive-lock","object-map","fast-diff","deep-flatten"]
[Flag]    []

 

Is there another way to detect invalid object maps?

 

Ceph 12.2.7 – All Bluestore

Kind regards,

 

Glen Baars

 

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