Dear developers/users,
Please suggest a solution for this.
Regards,
Naranderan R
On Fri, 22 May 2020 at 21:46, Naranderan Ramakrishnan <rnaranbe@xxxxxxxxx> wrote:
Dear team,We are using Gluster(v 7.0) as our primary data storage system and faced an issue recently. Please find the details below.Simple Background:A 2x3(DxR) volume is mounted in a few main-clients via FUSE mount. From these main clients, a lot of sub-clients will consume the required subset of data(a folder) via rsync. These sub-clients will also produce data to these main clients via rsync which will be propagated Gluster. In a simplified form,
Gluster(Brick1, Brick2 .. Brick6) --> Main-clients(FUSE mount of Gluster) --> Sub-clients(rsync from/to main-client)Issue:Due to some network issues, 2 bricks belong to the same replica sub-volume(say replica1) went unreachable from a main-client. This triggers 'client quorum is not met' - the client quorum policy is 'auto' & quorum-count is 2 due to this policy - so the replica1 went unavailable for this main-client.
So dirs&files in this replica1 were not listed but replica2 dirs&files were listed in the mount-point of the main-client. But the sub-clients were not aware of these background issues, they have read the listed files(of replica2 only) which resulted in undesired and unintentional behaviors.
Expectation:This is totally unexpected that subset of dirs&files will be available in a mount-point. A main-client should list either all the dirs & files or nothing. This is very critical to our application nature. Our application prefers consistency and atomicity to HA.
It would be much better if there is an option to enable atomic read even during these kinds of unexpected issues. Please let us know how can we achieve this.
Thanks in advance.
Regards,
Naranderan R
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