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https://review.opendev.org/openstack/swift refs/changes/88/777288/1"}}},"commit":{"parents":[{"commit":"5791cec31e6935a9af691dbd181bc1657d87ce2d","subject":"Use swiftclient Connections in sharding probe tests","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/swift/commit/5791cec31e6935a9af691dbd181bc1657d87ce2d"}]}],"author":{"name":"Clay Gerrard","email":"clay.gerrard@gmail.com","date":"2020-11-09 21:46:45.000000000","tz":-360},"committer":{"name":"Pete Zaitcev","email":"zaitcev@kotori.zaitcev.us","date":"2021-02-24 02:47:35.000000000","tz":-360},"subject":"Populate shrinking shards with shard ranges learnt from root","message":"Populate shrinking shards with shard ranges learnt from root\n\nShard shrinking can be instigated by a third party modifying shard\nranges, moving one shard to shrinking state and expanding the\nnamespace of one or more other shard(s) to act as acceptors. These\nstate and namespace changes must propagate to the shrinking and\nacceptor shards. The shrinking shard must also discover the acceptor\nshard(s) into which it will shard itself.\n\nThe sharder audit function already updates shards with their own state\nand namespace changes from the root. However, there is currently no\nmechanism for the shrinking shard to learn about the acceptor(s) other\nthan by a PUT request being made to the shrinking shard container.\n\nThis patch modifies the shard container audit function so that other\noverlapping shards discovered from the root are merged into the\naudited shard\u0027s db. In this way, the audited shard will have acceptor\nshards to cleave to if shrinking.\n\nThis new behavior is restricted to when the shard is shrinking. In\ngeneral, a shard is responsible for processing its own sub-shard\nranges (if any) and reporting them to root. Replicas of a shard\ncontainer synchronise their sub-shard ranges via replication, and do\nnot rely on the root to propagate sub-shard ranges between shard\nreplicas. The exception to this is when a third party (or\nauto-sharding) wishes to instigate shrinking by modifying the shard\nand other acceptor shards in the root container.  In other\ncircumstances, merging overlapping shard ranges discovered from the\nroot is undesirable because it risks shards inheriting other unrelated\nshard ranges. For example, if the root has become polluted by\nsplit-brain shard range management, a sharding shard may have its\nsub-shards polluted by an undesired shard from the root.\n\nDuring the shrinking process a shard range\u0027s own shard range state may\nbe either shrinking or, prior to this patch, sharded. The sharded\nstate could occur when one replica of a shrinking shard completed\nshrinking and moved the own shard range state to sharded before other\nreplica(s) had completed shrinking. This makes it impossible to\ndistinguish a shrinking shard (with sharded state), which we do want\nto inherit shard ranges, from a sharding shard (with sharded state),\nwhich we do not want to inherit shard ranges.\n\nThis patch therefore introduces a new shard range state, \u0027SHRUNK\u0027, and\napplies this state to shard ranges that have completed shrinking.\nShards are now restricted to inherit shard ranges from the root only\nwhen their own shard range state is either SHRINKING or SHRUNK.\n\nThis patch also:\n\n - Stops overlapping shrinking shards from generating audit warnings:\n   overlaps are cured by shrinking and we therefore expect shrinking\n   shards to sometimes overlap.\n\n - Extends an existing probe test to verify that overlapping shard\n   ranges may be resolved by shrinking a subset of the shard ranges.\n\n - Adds a --no-auto-shard option to swift-container-sharder to enable the\n   probe tests to disable auto-sharding.\n\n - Improves sharder logging, in particular by decrementing ranges_todo\n   when a shrinking shard is skipped during cleaving.\n\n - Adds a ShardRange.sort_key class method to provide a single definition\n   of ShardRange sort ordering.\n\n - Improves unit test coverage for sharder shard auditing.\n\nCo-Authored-By: Tim Burke \u003ctim.burke@gmail.com\u003e\nCo-Authored-By: Alistair Coles \u003calistairncoles@gmail.com\u003e\nCherry-Picked-From: I9034a5715406b310c7282f1bec9625fe7acd57b6\nChange-Id: Ifc5d1ae142f63520df49fe610c94b332dcea3180\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/swift/commit/18cdf9b5680b6d9a2201e9781771e3a5efac0355"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/swift/commit/18cdf9b5680b6d9a2201e9781771e3a5efac0355"}]},"branch":"refs/heads/stable/ussuri"}},"requirements":[],"submit_records":[{"status":"CLOSED","labels":[{"label":"Verified","status":"OK","applied_by":{"_account_id":22348,"name":"Zuul","username":"zuul","tags":["SERVICE_USER"]}},{"label":"Code-Review","status":"OK","applied_by":{"_account_id":15343,"name":"Tim Burke","email":"tburke@nvidia.com","username":"tburke"}},{"label":"Workflow","status":"OK","applied_by":{"_account_id":15343,"name":"Tim Burke","email":"tburke@nvidia.com","username":"tburke"}}]}],"submit_requirements":[{"name":"Verified","status":"SATISFIED","is_legacy":true,"submittability_expression_result":{"expression":"label:Verified\u003dCustom-Rule","fulfilled":true,"status":"PASS","passing_atoms":["label:Verified\u003dCustom-Rule"],"failing_atoms":[],"atom_explanations":{}}},{"name":"Workflow","status":"SATISFIED","is_legacy":true,"submittability_expression_result":{"expression":"label:Workflow\u003dCustom-Rule","fulfilled":true,"status":"PASS","passing_atoms":["label:Workflow\u003dCustom-Rule"],"failing_atoms":[],"atom_explanations":{}}},{"name":"Code-Review","status":"SATISFIED","is_legacy":true,"submittability_expression_result":{"expression":"label:Code-Review\u003dCustom-Rule","fulfilled":true,"status":"PASS","passing_atoms":["label:Code-Review\u003dCustom-Rule"],"failing_atoms":[],"atom_explanations":{}}}]}