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If the\nnova-api does not receive a response within `rpc_response_timeout` it will\ntreat the request as failed and raise an exception.\n\nThere are multiple cases where nova-compute actually already processed the\nrequest and just the reply did not reach the nova-api in time (see bug report).\nAfter the failed request the database will contain a BlockDeviceMapping entry\nfor the volume + instance combination that will never be cleaned up again.\nThis entry also causes the nova-api to reject all future attachments of this\nvolume to this instance (as it assumes it is already attached).\n\nTo work around this we check if a BlockDeviceMapping has already been created\nwhen we see a messaging timeout. If this is the case we can safely delete it\nas the compute node has already finished processing and we will no longer pick\nit up.\nThis allows users to try the request again.\n\nA previous fix was abandoned but without a clear reason ([1]).\n\n[1]: https://review.opendev.org/c/openstack/nova/+/731804\n\nCloses-Bug: 1960401\nChange-Id: I17f4d7d2cb129c4ec1479cc4e5d723da75d3a527\n(cherry picked from commit 9eb116b99ce32bc69c4abf8ec3b0179ef89a8860)\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/b9406c0a22f4ad821661a3dfc93f6b72c38e847e"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/b9406c0a22f4ad821661a3dfc93f6b72c38e847e"}]},"branch":"refs/heads/stable/stein"},"9425ad78a95da2d8dc5309dd32867dbc0a3d21a4":{"kind":"REWORK","_number":2,"created":"2022-02-22 08:06:17.000000000","uploader":{"_account_id":29074,"name":"Felix Huettner","email":"felix.huettner@digits.schwarz","username":"felix.huettner"},"ref":"refs/changes/59/829859/2","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/nova","ref":"refs/changes/59/829859/2","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/nova refs/changes/59/829859/2 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/nova refs/changes/59/829859/2 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/nova refs/changes/59/829859/2 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/nova refs/changes/59/829859/2"}}},"commit":{"parents":[{"commit":"85cda94e672a9ca0f512589d543a5a6659d285ad","subject":"[stable-only] Pin virtualenv and setuptools","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/85cda94e672a9ca0f512589d543a5a6659d285ad"}]}],"author":{"name":"Felix Huettner","email":"felix.huettner@mail.schwarz","date":"2022-02-09 11:03:15.000000000","tz":60},"committer":{"name":"Felix Huettner","email":"felix.huettner@mail.schwarz","date":"2022-02-22 08:06:10.000000000","tz":60},"subject":"Gracefull recovery when attaching volume fails","message":"Gracefull recovery when attaching volume fails\n\nWhen trying to attach a volume to an already running instance the nova-api\nrequests the nova-compute service to create a BlockDeviceMapping. If the\nnova-api does not receive a response within `rpc_response_timeout` it will\ntreat the request as failed and raise an exception.\n\nThere are multiple cases where nova-compute actually already processed the\nrequest and just the reply did not reach the nova-api in time (see bug report).\nAfter the failed request the database will contain a BlockDeviceMapping entry\nfor the volume + instance combination that will never be cleaned up again.\nThis entry also causes the nova-api to reject all future attachments of this\nvolume to this instance (as it assumes it is already attached).\n\nTo work around this we check if a BlockDeviceMapping has already been created\nwhen we see a messaging timeout. If this is the case we can safely delete it\nas the compute node has already finished processing and we will no longer pick\nit up.\nThis allows users to try the request again.\n\nA previous fix was abandoned but without a clear reason ([1]).\n\n[1]: https://review.opendev.org/c/openstack/nova/+/731804\n\nCloses-Bug: 1960401\nChange-Id: I17f4d7d2cb129c4ec1479cc4e5d723da75d3a527\n(cherry picked from commit 9eb116b99ce32bc69c4abf8ec3b0179ef89a8860)\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/9425ad78a95da2d8dc5309dd32867dbc0a3d21a4"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/9425ad78a95da2d8dc5309dd32867dbc0a3d21a4"}]},"branch":"refs/heads/stable/stein"}},"requirements":[],"submit_records":[],"submit_requirements":[]}