[Bugs] [Bug 1439571] New: dht/rebalance: Improve rebalance crawl performance

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1439571

            Bug ID: 1439571
           Summary: dht/rebalance: Improve rebalance crawl performance
           Product: GlusterFS
           Version: mainline
         Component: distribute
          Assignee: spalai at redhat.com
          Reporter: spalai at redhat.com
                CC: bugs at gluster.org



Description of problem:
  This bug is created to track development for rebalance crawl performance.

 The job of the crawler in rebalance is to fetch files from each local
subvolume and push them to migration queue if it is eligible for migration. And
we do a lookup on the entries received to figure out the eligibilty. Since, the
lookup done is on a local subvolume we receive linkto files and regular files
as well. 

Rebalance currently does two lookups to separate linkto files from data files.
Instead it can get the linkto file information(both attr and xattr) from
readdirp which will remove one lookup cost. And the other lookup on the data
file can be off loaded to migrator threads.

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