path: root/xlators/features/changelog/lib/src/gf-changelog.c
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authorAvra Sengupta <>2014-04-22 00:52:57 +0000
committerVijay Bellur <>2014-04-28 04:02:22 -0700
commit54a5a42848870ee17b923c6c37d65fdfe4a5fec9 (patch)
treef3203513924efaa7c28b2419611729356cc9066e /xlators/features/changelog/lib/src/gf-changelog.c
parenta7c8d514c0487019d218c327deb52f7d09645875 (diff)
glusterd/snapshot: Compare and update snapshots during peer handshake
During a peer-handshake, after the volumes have synced, and the list of missed snapshots have synced, the node will perform the pending deletes and restores on this list. At this point, the current snapshot list in the node will be updated, and hence in case of conflicts arising during snapshot handshake, the peer hosting the bricks will be given precedence Likewise, if there will be a conflict, and both peers will be in the same state, i.e either both would be hosting bricks or both would not be hosting bricks, then a decision can't be taken and a peer-reject will happen. glusterd_compare_and_update_snap() implements the following algorithm to perform the above task: Step 1: Start. Step 2: Check if the peer is missing a delete on the said snap. If yes, goto step 6. Step 3: Check if there is a conflict between the peer's data and the local snap. If no, goto step 5. Step 4: As there is a conflict, check if both the peer and the local nodes are hosting bricks. Based on the results perform the following: Peer Hosts Bricks Local Node Hosts Bricks Action Yes Yes Goto Step 7 No No Goto Step 7 Yes No Goto Step 8 No Yes Goto Step 6 Step 5: Check if the local node is missing the peer's data. If yes, goto step 9. Step 6: It's a no-op. Goto step 10 Step 7: Peer Reject. Goto step 10 Step 8: Delete local node's data. Step 9: Accept Peer Data. Step 10: Stop Change-Id: I79be0f0f5f2a4f5c72277a4e77c2be732af432e1 BUG: 1061685 Signed-off-by: Avra Sengupta <> Reviewed-on: Tested-by: Gluster Build System <> Reviewed-by: Krishnan Parthasarathi <> Reviewed-by: Rajesh Joseph <> Reviewed-by: Atin Mukherjee <> Reviewed-by: Vijay Bellur <>
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