[Bugs] [Bug 1304287] New: Make the WRITE_IS_APPEND feature in AFR dynamically configurable for performance necessity

bugzilla at redhat.com bugzilla at redhat.com
Wed Feb 3 09:15:24 UTC 2016


https://bugzilla.redhat.com/show_bug.cgi?id=1304287

            Bug ID: 1304287
           Summary: Make the WRITE_IS_APPEND feature in AFR dynamically
                    configurable for performance necessity
           Product: GlusterFS
           Version: mainline
         Component: replicate
          Assignee: bugs at gluster.org
          Reporter: li.ping288 at zte.com.cn
                CC: bugs at gluster.org



Description of problem:

    Problem:
    AS discussed at
    http://www.gluster.org/pipermail/gluster-devel/2016-January/047915.html

    The WRITE_IS_APPEND in afr_writev leads to locking for each file writing
operation
    in posix_writev in the server end.  This lock then impacts on the
concurrent ability
    of posix_writev to do final file writing and results in AFR writing
performance drop.

    Fix:
    Make the WRITE_IS_APPEND feature in AFR dynamically configurable.
    Enable or disable it under the necessity of performance.

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