ea8e545a27
Change the behavior of the EC reconstructor to perform a fragment rebuild to a handoff node when a primary peer responds with 507 to the REPLICATE request. Each primary node in a EC ring will sync with exactly three primary peers, in addition to the left & right nodes we now select a third node from the far side of the ring. If any of these partners respond unmounted the reconstructor will rebuild it's fragments to a handoff node with the appropriate index. To prevent ssync (which is uninterruptible) receiving a 409 (Conflict) we must give the remote handoff node the correct backend_index for the fragments it will recieve. In the common case we will use determistically different handoffs for each fragment index to prevent multiple unmounted primary disks from forcing a single handoff node to hold more than one rebuilt fragment. Handoff nodes will continue to attempt to revert rebuilt handoff fragments to the appropriate primary until it is remounted or rebalanced. After a rebalance of EC rings (potentially removing unmounted/failed devices), it's most IO efficient to run in handoffs_only mode to avoid unnecessary rebuilds. Closes-Bug: #1510342 Change-Id: Ief44ed39d97f65e4270bf73051da9a2dd0ddbaec |
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| functional | ||
| probe | ||
| unit | ||
| __init__.py | ||
| sample.conf | ||