[Bugs] [Bug 1207603] New: Persist file size and block count of sharded files in the form of xattrs

bugzilla at redhat.com bugzilla at redhat.com
Tue Mar 31 09:46:50 UTC 2015


            Bug ID: 1207603
           Summary: Persist file size and block count of sharded files in
                    the form of xattrs
           Product: GlusterFS
           Version: mainline
         Component: sharding
          Assignee: bugs at gluster.org
          Reporter: kdhananj at redhat.com
        QA Contact: bugs at gluster.org
                CC: bugs at gluster.org

Description of problem:
Metadata read fops like stat, fstat, lookup, readdirp etc return the file size
and block count in their response. This means that for shard'ed files, it is
necessary to look up each of the shards associated with the file and aggregate
their block count and block_size before returning it to the translators above.
But that would involve lot of network fops, increasing the latency of these
fops. To get around this problem, the size and block count can be kept up to
data in the form of an xattr on the first shard with each inode write operation
(like writev, truncate, ftruncate, zerofill, discard, fallocate etc).

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