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

[bugzilla at redhat.com]

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

Divya <divya at redhat.com> changed:

           What    |Removed                     |Added
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                 CC|                            |divya at redhat.com
              Flags|                            |needinfo?(kdhananj at redhat.c
                   |                            |om)


--- Doc Text *updated* ---
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 to be followed by a LOOKUP, leading to 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. 


--- Comment #10 from Divya <divya at redhat.com> ---
Krutika,

Could you please review and sign-off the edited doc text?

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