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ff1a81c872
The current non-deterministic IP allocation algorithm balances IPs across the whole cluster. It does not consider different interfaces/VLANs/subnets, so these different groups of IPs aren't generally well balanced. This adds the LCP2 algorithm for IP allocation and allows it to be enabled by setting the "LCP2PublicIPs" tunable to 1. The LCP2 algorithm calculates the imbalance of a node by totalling the squares of the distances between each IP on the node. The IP distance is defined as the length longest common prefix (LCP) of bits that is found when comparing 2 IPs. The imbalance of a cluster is the maximum imbalance for any node. At each step the algorithm selects an allocation to the IP/node combination that results in the choosing the allocation that best reduces the imbalance of the cluster. The implementation splits out the IP allocation part of ctdb_takeover_run() into new function ctdb_takeover_run_core(), and then extracts out the basic IP assignment code into new functions basic_allocate_unassigned() and basic_failback(). 3 new functions lcp2_init(), lcp2_allocate_unassigned() and lcp2_failback() implement the LCP2 algorithm, and are hooked into ctdb_takeover_run_core(). Signed-off-by: Martin Schwenke <martin@meltin.net> (This used to be ctdb commit 61fc7fbd0235469df22deb6581c6bd47e30bc0be) |
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| .. | ||
| cmdline.h | ||
| ctdb_client.h | ||
| ctdb_private.h | ||
| ctdb_protocol.h | ||
| ctdb_typesafe_cb.h | ||
| ctdb.h | ||
| idtree.h | ||
| includes.h | ||