Assert the stability of custom search preferences #41150
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Today the `?preference=custom_string_value` search preference will only change its choice of a shard copy if something changes the `IndexShardRoutingTable` for that specific shard. Users can use this behaviour to route searches to a consistent set of shard copies, which means they can reliably hit copies with hot caches, and use the other copies only for redundancy in case of failure. However we do not assert this property anywhere, so we might break it in future. This commit adds a test that shows that searches are routed consistently even if other indices are created/rebalanced/deleted. Relates https://discuss.elastic.co/t/176598, elastic#41115, elastic#26791
DaveCTurner
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We discussed this and agreed to add this test to make sure that we do not unconsciously change this behaviour in future, but to leave the docs as they are since we cannot really guarantee that any given |
jpountz
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Apr 17, 2019
DaveCTurner
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Today the `?preference=custom_string_value` search preference will only change its choice of a shard copy if something changes the `IndexShardRoutingTable` for that specific shard. Users can use this behaviour to route searches to a consistent set of shard copies, which means they can reliably hit copies with hot caches, and use the other copies only for redundancy in case of failure. However we do not assert this property anywhere, so we might break it in future. This commit adds a test that shows that searches are routed consistently even if other indices are created/rebalanced/deleted. Relates https://discuss.elastic.co/t/176598, #41115, #26791
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Today the `?preference=custom_string_value` search preference will only change its choice of a shard copy if something changes the `IndexShardRoutingTable` for that specific shard. Users can use this behaviour to route searches to a consistent set of shard copies, which means they can reliably hit copies with hot caches, and use the other copies only for redundancy in case of failure. However we do not assert this property anywhere, so we might break it in future. This commit adds a test that shows that searches are routed consistently even if other indices are created/rebalanced/deleted. Relates https://discuss.elastic.co/t/176598, elastic#41115, elastic#26791
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Today the
?preference=custom_string_valuesearch preference will only changeits choice of a shard copy if something changes the
IndexShardRoutingTablefor that specific shard. Users can use this behaviour to route searches to a
consistent set of shard copies, which means they can reliably hit copies with
hot caches, and use the other copies only for redundancy in case of failure.
However we do not assert this property anywhere, so we might break it in
future.
This commit adds a test that shows that searches are routed consistently even
if other indices are created/rebalanced/deleted.
Relates https://discuss.elastic.co/t/176598, #41115, #26791