blocking clients connection during rdb persistence

[George Chilumbu]

During rdb persistence, does redis block client writes during the forking duration, or during the duration of taking the snapshot, to during both phrases?

For example, if forking takes 2 seconds, and 10 minutes for the snapshot to complete, what is the total time redis will block writes?

Use also refer to the log below to provide the answer

1428:M 18 Oct 14:15:06.014 * 100000 changes in 3600 seconds. Saving...

1428:M 18 Oct 14:15:07.303 * Background saving started by pid 24251

24251:C 18 Oct 14:26:19.719 * DB saved on disk

24251:C 18 Oct 14:26:21.226 * RDB: 59 MB of memory used by copy-on-write

1428:M 18 Oct 14:26:22.879 * Background saving terminated with success