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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

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    • Resolution: Fixed
    • Icon: Major Major
    • Lustre 2.2.0
    • Lustre 2.2.0
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      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

        1. meta-test-100k-2.2.91.txt
          13 kB
        2. meta-test-1600k-2.2.91-LU925.txt
          11 kB
        3. Statahead_and_AGL.pdf
          219 kB

            yong.fan nasf (Inactive)
            adilger Andreas Dilger
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