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For information on how to proceed, see https://docs.openstack.org/infra/manual/developers.html\n\n- EMC_PowerFlex_NOVA http://publiclogs.emc.com/85/804985/3/check/EMC_PowerFlex_NOVA/78e5870/EMC_PowerFlex_NOVA/None : NOT_REGISTERED\n\nLeave a comment with \u0027run-DellEMC PowerFlex CI\u0027 to trigger a recheck. For more information about CI, please see https://wiki.openstack.org/wiki/ThirdPartySystems/DellEMC_PowerFlex_CI","accounts_in_message":[],"_revision_number":3},{"id":"e6eddd2104d423b51d8c4beb14e3eaa7998cf177","author":{"_account_id":27838,"name":"Vadym Markov","email":"vmarkov@mirantis.com","username":"vmarkov"},"date":"2021-08-23 15:46:57.000000000","message":"Patch Set 3:\n\n\u003e Patch Set 3: Code-Review-1\n\u003e \n\u003e (1 comment)\n\u003e \n\u003e This likely will not break anything but we do not support runing nova in a multi threaded context via uwsgi so before we move forward with this we should discuss if that is something we actully want to support going forward as we know there are some eventlet related issues when greentreads are resumed on different os treads.\n\nGet notification about this issue at product deployment, and tried to reproduce on devstack env. Probably i need to dig deeper and file a bug to discuss an issue. Issue is difficult to reproduce, but for now main hypothesis that batch instance delete handled by several threads(?) of the single Nova node leads to mysql error 2013 \u0027Lost connection to MySQL server during query\u0027 bug. Very similar behavior was reproduced on testbench doing simultaneous mysql reads from several threads using non-scoped sqlalchemy session","accounts_in_message":[],"_revision_number":3},{"id":"79bb7dcbe5ee455e094512a79f2c83cf064ad734","tag":"autogenerated:cloudbase-ci","author":{"_account_id":26515,"name":"Cloudbase Nova Hyper-V CI","email":"nova_hyperv_ci@cloudbasesolutions.com","username":"nova_hyperv_ci"},"date":"2021-08-23 16:21:03.000000000","message":"Patch Set 3:\n\nBuild succeeded. For checking Nova with Ceph, add a comment with run-Cloudbase Nova Ceph Hyper-V CI\n\n- nova http://cloudbase-ci.com/nova/804985/3/iscsi : SUCCESS in 2h 37m 10s","accounts_in_message":[],"_revision_number":3},{"id":"aeda39f5bddff8b6b254f555dc004aea6c80a640","author":{"_account_id":9008,"name":"VMware NSX CI","username":"vmwareminesweeper","tags":["SERVICE_USER"]},"date":"2021-08-23 17:09:00.000000000","message":"Patch Set 3:\n\nBuild succeeded\n\n- dsvm-nova http://207.189.188.190/logs/804985/804985/3/check-not-vote/ext-nova-zuul/1a8a699 : SUCCESS in 1h 03m 15s","accounts_in_message":[],"_revision_number":3},{"id":"7aebd05df5e50a31acf023d3a05038e007742d57","tag":"autogenerated:jenkins-gerrit-trigger","author":{"_account_id":9732,"name":"Mellanox CI","email":"mlnx-openstack-ci@dev.mellanox.co.il","username":"mellanox","tags":["SERVICE_USER"]},"date":"2021-08-24 08:46:21.000000000","message":"Patch Set 3:\n\nBuild Successful \n\n* SRIOV-nova-direct http://13.74.249.42/refs/changes/85/804985/3/SRIOV-nova-direct : SUCCESS\n\n* SRIOV-nova-macvtap http://13.74.249.42/refs/changes/85/804985/3/SRIOV-nova-macvtap : SUCCESS","accounts_in_message":[],"_revision_number":3},{"id":"a428e15743b3f50d6e40ac5b3c91f02a68dc8884","author":{"_account_id":11604,"name":"sean mooney","email":"smooney@redhat.com","username":"sean-k-mooney"},"date":"2021-08-27 12:03:29.000000000","message":"Patch Set 3:\n\n\u003e Patch Set 3:\n\u003e \n\u003e \u003e Patch Set 3: Code-Review-1\n\u003e \u003e \n\u003e \u003e (1 comment)\n\u003e \u003e \n\u003e \u003e This likely will not break anything but we do not support runing nova in a multi threaded context via uwsgi so before we move forward with this we should discuss if that is something we actully want to support going forward as we know there are some eventlet related issues when greentreads are resumed on different os treads.\n\u003e \n\u003e Get notification about this issue at product deployment, and tried to reproduce on devstack env. Probably i need to dig deeper and file a bug to discuss an issue. Issue is difficult to reproduce, but for now main hypothesis that batch instance delete handled by several threads(?) of the single Nova node leads to mysql error 2013 \u0027Lost connection to MySQL server during query\u0027 bug. Very similar behavior was reproduced on testbench doing simultaneous mysql reads from several threads using non-scoped sqlalchemy session\n\nthe nova compute agent process is singel theraded for the most part.\n\nit has a option to run with a second thread for rpc heatbeats but that is all that thread does and it\nuse a seperate thread and proxy implemeaiton to comunicate with libvit but all of that is contole by a single main tread in which nova uses event let for coperative multi tasking.\n\nwe do not use multiple threads to execute any opertation in nova.\n\nthe compute agents also do not access the db directly they do that by rpc calls via the conductor.\nthe conductor is also single threaded in the same way using event let for coperative multi tasking using corotines.\n\nhttps://github.com/openstack/nova/blob/master/doc/source/reference/threading.rst descibes novas threading model in more detail.\n\ni think your best path forward would be to file a bug with the details fo the problem you are hitting and the version of openstack, os ectra that you have deployed so we can triage the bug report.","accounts_in_message":[],"_revision_number":3}],"current_revision_number":3,"current_revision":"d8568afecfa418821096e5587c56f0322d971ef2","revisions":{"459ac0e138c3c82d4211efdaa09690bd9634f896":{"kind":"REWORK","_number":1,"created":"2021-08-18 11:07:47.000000000","uploader":{"_account_id":27838,"name":"Vadym Markov","email":"vmarkov@mirantis.com","username":"vmarkov"},"ref":"refs/changes/85/804985/1","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/nova","ref":"refs/changes/85/804985/1","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/nova refs/changes/85/804985/1 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/nova refs/changes/85/804985/1 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/nova refs/changes/85/804985/1 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/nova refs/changes/85/804985/1"}}},"commit":{"parents":[{"commit":"370830e9445c9825d1e34e60cca01fdfe88d5d82","subject":"Merge \"libvirt: Enable \u0027vmcoreinfo\u0027 feature by default\"","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/370830e9445c9825d1e34e60cca01fdfe88d5d82"}]}],"author":{"name":"Vadym Markov","email":"vmarkov@mirantis.com","date":"2021-08-18 10:00:44.000000000","tz":180},"committer":{"name":"Vadym Markov","email":"vmarkov@mirantis.com","date":"2021-08-18 11:07:44.000000000","tz":180},"subject":"Fix for concurrent DB update issue","message":"Fix for concurrent DB update issue\n\nCurrently, Nova relies on oslo_db managing connection to DB, sessions,\ntransaction handling, etc. Oslo_db uses SQLAlchemy as intermediate ORM\nlayer, which provides regular Session object to Nova context. But Nova\nuses multi-thread architecture on top of uwsgi, which requires\nthread-safe scoped_session. Modifying of oslo_db seems to be very\ndifficult because it strongly relies on current session mechanism. So,\nthis patch proposing lock usage which prevents multiple thread of the\nsame Nova node writing to DB simultaneously\n\nChange-Id: Ia36b8e4eac507b826385d69f039eaca95ab617be\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/459ac0e138c3c82d4211efdaa09690bd9634f896"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/459ac0e138c3c82d4211efdaa09690bd9634f896"}]},"branch":"refs/heads/master"},"a3192c8484bde5c6f8c3ef19ac1c76ba32a42166":{"kind":"NO_CHANGE","_number":2,"created":"2021-08-18 11:08:03.000000000","uploader":{"_account_id":27838,"name":"Vadym Markov","email":"vmarkov@mirantis.com","username":"vmarkov"},"ref":"refs/changes/85/804985/2","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/nova","ref":"refs/changes/85/804985/2","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/nova refs/changes/85/804985/2 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/nova refs/changes/85/804985/2 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/nova refs/changes/85/804985/2 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/nova refs/changes/85/804985/2"}}},"commit":{"parents":[{"commit":"370830e9445c9825d1e34e60cca01fdfe88d5d82","subject":"Merge \"libvirt: Enable \u0027vmcoreinfo\u0027 feature by default\"","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/370830e9445c9825d1e34e60cca01fdfe88d5d82"}]}],"author":{"name":"Vadym Markov","email":"vmarkov@mirantis.com","date":"2021-08-18 10:00:44.000000000","tz":180},"committer":{"name":"Vadym Markov","email":"vmarkov@mirantis.com","date":"2021-08-18 11:07:50.000000000","tz":180},"subject":"Fix for concurrent DB update issue","message":"Fix for concurrent DB update issue\n\nCurrently, Nova relies on oslo_db managing connection to DB, sessions,\ntransaction handling, etc. Oslo_db uses SQLAlchemy as intermediate ORM\nlayer, which provides regular Session object to Nova context. But Nova\nuses multi-thread architecture on top of uwsgi, which requires\nthread-safe scoped_session. Modifying of oslo_db seems to be very\ndifficult because it strongly relies on current session mechanism. So,\nthis patch proposing lock usage which prevents multiple thread of the\nsame Nova node writing to DB simultaneously\n\nChange-Id: Ia36b8e4eac507b826385d69f039eaca95ab617be\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/a3192c8484bde5c6f8c3ef19ac1c76ba32a42166"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/a3192c8484bde5c6f8c3ef19ac1c76ba32a42166"}]},"branch":"refs/heads/master"},"d8568afecfa418821096e5587c56f0322d971ef2":{"kind":"REWORK","_number":3,"created":"2021-08-23 13:38:10.000000000","uploader":{"_account_id":27838,"name":"Vadym Markov","email":"vmarkov@mirantis.com","username":"vmarkov"},"ref":"refs/changes/85/804985/3","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/nova","ref":"refs/changes/85/804985/3","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/nova refs/changes/85/804985/3 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/nova refs/changes/85/804985/3 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/nova refs/changes/85/804985/3 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/nova refs/changes/85/804985/3"}}},"commit":{"parents":[{"commit":"10b1dc84f47a71061340f8e0ae0fe32dca44061a","subject":"Merge \"fup: Move _migrate_stub into LibvirtMigrationMixin\"","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/10b1dc84f47a71061340f8e0ae0fe32dca44061a"}]}],"author":{"name":"Vadym Markov","email":"vmarkov@mirantis.com","date":"2021-08-18 10:00:44.000000000","tz":180},"committer":{"name":"Vadym Markov","email":"vmarkov@mirantis.com","date":"2021-08-23 13:37:44.000000000","tz":180},"subject":"Fix for concurrent DB update issue","message":"Fix for concurrent DB update issue\n\nCurrently, Nova relies on oslo_db managing connection to DB, sessions,\ntransaction handling, etc. Oslo_db uses SQLAlchemy as intermediate ORM\nlayer, which provides regular Session object to Nova context. 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