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authorVenkatesh Somyajulu <vsomyaju@redhat.com>2014-06-17 15:09:50 +0530
committerVijay Bellur <vbellur@redhat.com>2014-06-17 05:39:22 -0700
commit93832829016a0a51a8938c0c89c6bd09b3229c9f (patch)
tree46bf0526f0585e1046141cd265dfb3afd1844cd5 /geo-replication/syncdaemon/monitor.py
parent3a499d170de2c7df06b127b709d27c64cef98886 (diff)
cluster/dht: Do layout self healing of directory for nameless lookup
Problem: Currently in the nameless lookup code path, if at the end of the lookup, even if it detects that layout anamolies are there, layout healing will not be done as there is no code to heal it. So there can be race between mkdir and lookup. Assume mkdir is going on from some other mount point, Say, M1. Directories are created on some nodes but layout is not set yet. Now from M2, nameless lookup goes, lookup will be success full as the directory is present on some of the nodes, but it won't heal layout. Now if create goes after lookup fop, because layout is absent, file creation will fail. Fix: Included the code of layout self-heal in the nameless lookup path. At the end of lookup, layout will be computed as it would have been in the named lookup, but it will be set to those node only, where directory is present. So after that if create fop goes, the probabiliy to get the subvolume with proper hash-range is high now, so reduces the race window. Other: Whenever a directory is created, we have to choose a brick from which we start allocating layout in a circular fashion. To calculate this starting brick, I have changed the candidate from name of the directory to gfid of the directory But to compute where a given file belongs, we will still use the name of the file. Hash computed from the name of the file should belong to any one of the directory-hash-range Calculation of hash for a file is acting as a consumer and the setting of directory layout based on gfid is acting as a producer, which are independent from each other. Change-Id: I3808c55082cd1b5c72d2c77cbbc063f55aa38bee BUG: 1095888 Signed-off-by: Venkatesh Somyajulu <vsomyaju@redhat.com> Reviewed-on: http://review.gluster.org/7493 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Raghavendra Bhat <raghavendra@redhat.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
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