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  1. Lustre
  2. LU-925

land Async Glimpse Lock (AGL) to master to pre-fetch size/block attributes from OSTs for statahead

    Details

    • Type: Task
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: Lustre 2.2.0
    • Fix Version/s: Lustre 2.2.0
    • Labels:
      None
    • Story Points:
      2
    • Rank (Obsolete):
      4772

      Description

      Lustre-2.x supports statahead, which pre-fetches object's attributes (like owner/mode/xtime/ACL, etc) from MDS, then most MDS-side RPCs are overlapped with other traversing process. But there is not file size/block attributes pre-fetching, the traversing thread has to send synchronous glimpse size RPC to OST(s) for that by itself. Before SOM is available, we should consider asynchronous glimpse size for per-fetching size/block attributes from OST(s). This

      http://review.whamcloud.com/#change,1243

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              • Assignee:
                yong.fan nasf (Inactive)
                Reporter:
                adilger Andreas Dilger
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                • Created:
                  Updated:
                  Resolved: