On Tue, Feb 6, 2018 at 3:15 PM, Pranith Kumar Karampuri <pkarampu@xxxxxxxxxx> wrote:
On Sun, Feb 4, 2018 at 5:09 PM, Raghavendra Gowdappa <rgowdapp@xxxxxxxxxx> wrote:All,
One of our users pointed out to the documentation that glusterfs is not good for storing "Structured data" [1], while discussing an issue [2]. Does any of you have more context on the feasibility of storing "structured data" on Glusterfs? Is one of the reasons for such a suggestion "staleness of metadata" as encountered in bugs like [3]?\I think the default configuration of glusterfs leads to unwanted behaviour with structured data workloads. Based on my experience with customers I handled, structured data usecase needs stronger read after write consistency guarantees from multiple clients which I don't think we got a chance to qualify. People who get it working generally disable perf xlators. Then there are some issues that happen because of distributed nature of glusterfs (For example: ctime). So technically we can get glusterfs to work for structured data workloads. We will need to find and fix issues by trying out that workload. Performance qualification on that will also be useful to analyse.
A note on this for people who are not aware about 'gluster-block' project:
https://github.com/gluster/gluster-block could be used to handle some such workloads. If anyone gets into issues on top of Gluster Filesystem mount, then feel free to try gluster-block out, and give us feedback to help improving it.
-Amar
[1] http://docs.gluster.org/en/latest/Install-Guide/Overview/
[2] https://bugzilla.redhat.com/show_bug.cgi?id=1512691
[3] https://bugzilla.redhat.com/show_bug.cgi?id=1390050
regards,
Raghavendra
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--Pranith
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Amar Tumballi (amarts)
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