cephfs miss data for 15s when master mds rebooting

["13605702596@xxxxxxx" <13605702596@xxxxxxx>]

hi

i used 3 nodes to deploy mds (each node also has mon on it)

my config:

[mds.ceph-node-10-101-4-17]
mds_standby_replay = true
mds_standby_for_rank = 0

[mds.ceph-node-10-101-4-21]
mds_standby_replay = true
mds_standby_for_rank = 0

[mds.ceph-node-10-101-4-22]
mds_standby_replay = true
mds_standby_for_rank = 0

the mds stat:

e29: 1/1/1 up {0=ceph-node-10-101-4-22=up:active}, 1 up:standby-replay, 1 up:standby

i mount the cephfs on the ceph client, and run the test script to write data into file under the cephfs dir,

when i reboot the master mds, and i found the data is not written into the file.

after 15 seconds, data can be written into the file again

so my question is: 

is this normal when reboot the master mds?

when will the up:standby-replay mds take over the the cephfs?

thanks

---

13605702596@xxxxxxx

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