[Bugs] [Bug 1439731] Sharding: Fix a performance bug

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1439731


--- Doc Text *updated* by Divya <divya at redhat.com> ---
Previously, a bug in shard's in-memory cache invalidation in STAT fop was causing it to send lots of LOOKUPs as part of cache-invalidation, even when the file was not undergoing any modification. As a consequence, every STAT call from the application is followed by a LOOKUP, leading to a sub-optimal performance of I/O operations on the VMs. With this fix, in-memory cache invalidation in shard's STAT operation was corrected. Now, in a pure-read workload, there was not as many LOOKUPs as the number of STATs, leading to improved VM performance. This also benefited performance in mixed read-write workload from the VMs.


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