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GitWeb","url":"https://opendev.org/openstack/nova/commit/cef67a0be765cb057a85a80657a3b8b426dd4dd4"}]}],"author":{"name":"melanie witt","email":"melwittt@gmail.com","date":"2020-03-06 17:05:28.000000000","tz":0},"committer":{"name":"melanie witt","email":"melwittt@gmail.com","date":"2020-03-19 21:14:52.000000000","tz":0},"subject":"Lowercase ironic driver hash ring and ignore case in cache","message":"Lowercase ironic driver hash ring and ignore case in cache\n\nRecently we had a customer case where attempts to add new ironic nodes\nto an existing undercloud resulted in half of the nodes failing to be\ndetected and added to nova. Ironic API returned all of the newly added\nnodes when called by the driver, but half of the nodes were not\nreturned to the compute manager by the driver.\n\nThere was only one nova-compute service managing all of the ironic\nnodes of the all-in-one typical undercloud deployment.\n\nAfter days of investigation and examination of a database dump from the\ncustomer, we noticed that at some point the customer had changed the\nhostname of the machine from something containing uppercase letters to\nthe same name but all lowercase. The nova-compute service record had\nthe mixed case name and the CONF.host (socket.gethostname()) had the\nlowercase name.\n\nThe hash ring logic adds all of the nova-compute service hostnames plus\nCONF.host to hash ring, then the ironic driver reports only the nodes\nit owns by retrieving a service hostname from the ring based on a hash\nof each ironic node UUID.\n\nBecause of the machine hostname change, the hash ring contained, for\nexample: {\u0027MachineHostName\u0027, \u0027machinehostname\u0027} when it should have\ncontained only one hostname. And because the hash ring contained two\nhostnames, the driver was able to retrieve only half of the nodes as\nnodes that it owned. So half of the new nodes were excluded and not\nadded as new compute nodes.\n\nThis adds lowercasing of hosts that are added to the hash ring and\nignores case when comparing the CONF.host to the hash ring members\nto avoid unnecessary pain and confusion for users that make hostname\nchanges that are otherwise functionally harmless.\n\nThis also adds logging of the set of hash ring members at level DEBUG\nto help enable easier debugging of hash ring related situations.\n\nCloses-Bug: #1866380\n\nChange-Id: I617fd59de327de05a198f12b75a381f21945afb0\n(cherry picked from commit 7145100ee4e732caa532d614e2149ef2a545287a)\n(cherry picked from commit 588b0484bf6f5fe41514f1428aeaf5613635e35a)\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/8f8667a8dd0e453eaef8f75a3fff25db62d4cc17"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/8f8667a8dd0e453eaef8f75a3fff25db62d4cc17"}]},"branch":"refs/heads/stable/stein"}},"requirements":[],"submit_records":[],"submit_requirements":[]}