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I edited slightly the commit message and rebased, otherwise LGTM. I verified that it fixes the issue on a DevStack setup.","accounts_in_message":[],"_revision_number":3},{"id":"37db050819788c1704e3652b803d1ff4dd1f65bf","author":{"_account_id":22348,"name":"Zuul","username":"zuul","tags":["SERVICE_USER"]},"date":"2019-05-13 19:03:26.000000000","message":"Patch Set 3: Verified+1\n\nBuild succeeded (check pipeline).\n\n- openstack-tox-lower-constraints http://logs.openstack.org/35/650635/3/check/openstack-tox-lower-constraints/fac0e02/ : SUCCESS in 6m 06s\n- openstack-tox-pep8 http://logs.openstack.org/35/650635/3/check/openstack-tox-pep8/8080f9c/ : SUCCESS in 6m 17s\n- openstack-tox-py27 http://logs.openstack.org/35/650635/3/check/openstack-tox-py27/c462efc/ : SUCCESS in 7m 23s\n- openstack-tox-py35 http://logs.openstack.org/35/650635/3/check/openstack-tox-py35/61e3486/ : SUCCESS in 7m 47s\n- openstack-tox-py36 http://logs.openstack.org/35/650635/3/check/openstack-tox-py36/43eaca0/ : SUCCESS in 4m 45s\n- openstack-tox-py37 http://logs.openstack.org/35/650635/3/check/openstack-tox-py37/27fb751/ : SUCCESS in 5m 02s\n- openstack-tox-docs http://logs.openstack.org/35/650635/3/check/openstack-tox-docs/21cda6c/html/ : SUCCESS in 4m 18s\n- blazar-devstack-dsvm http://logs.openstack.org/35/650635/3/check/blazar-devstack-dsvm/f20788b/ : SUCCESS in 40m 54s\n- blazar-devstack-dsvm-py35 http://logs.openstack.org/35/650635/3/check/blazar-devstack-dsvm-py35/e1c9cc9/ : SUCCESS in 33m 27s\n- openstack-tox-pylint http://logs.openstack.org/35/650635/3/check/openstack-tox-pylint/efaeeec/ : SUCCESS in 6m 25s (non-voting)","accounts_in_message":[],"_revision_number":3},{"id":"b340dde7c2c6b707f24d46bdb8f67fe98254775f","author":{"_account_id":28543,"name":"shupeng","email":"15050873171@163.com","username":"Vieri"},"date":"2019-05-14 09:16:49.000000000","message":"Patch Set 3: Code-Review+1","accounts_in_message":[],"_revision_number":3},{"id":"46f6ab4bd19aef9f09d313e918acba8d0930845f","author":{"_account_id":28935,"name":"98k","email":"18552437190@163.com","username":"98k"},"date":"2019-05-14 15:17:07.000000000","message":"Patch Set 3: Code-Review+1","accounts_in_message":[],"_revision_number":3},{"id":"c05dff435d05fa7fa6da403e35104eb1743a3ab3","author":{"_account_id":25625,"name":"Tetsuro Nakamura","email":"tetsuro.nakamura.bc@hco.ntt.co.jp","username":"tetsuro0907"},"date":"2019-05-21 02:47:14.000000000","message":"Patch Set 3: Code-Review+2 Workflow+1\n\nGreat improvement. Thanks!","accounts_in_message":[],"_revision_number":3},{"id":"5fc8a1d0fa3684ee42f03f6508ef504a98ba6a78","author":{"_account_id":22348,"name":"Zuul","username":"zuul","tags":["SERVICE_USER"]},"date":"2019-05-21 02:47:26.000000000","message":"Patch Set 3: -Verified\n\nStarting gate jobs.","accounts_in_message":[],"_revision_number":3},{"id":"796e1491cb3c4e9cc092872993bc483686793e7e","author":{"_account_id":22348,"name":"Zuul","username":"zuul","tags":["SERVICE_USER"]},"date":"2019-05-21 03:33:51.000000000","message":"Change has been successfully merged by Zuul","accounts_in_message":[],"_revision_number":3},{"id":"550d11f7058034a7245d14d6f44564a42cbdd2a8","author":{"_account_id":22348,"name":"Zuul","username":"zuul","tags":["SERVICE_USER"]},"date":"2019-05-21 03:33:51.000000000","message":"Patch Set 3: Verified+2\n\nBuild succeeded (gate pipeline).\n\n- openstack-tox-lower-constraints http://logs.openstack.org/35/650635/3/gate/openstack-tox-lower-constraints/e1cf8d8/ : SUCCESS in 15m 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SIGHUP signal for blazar-manager correctly\n\nAfter a SIGHUP signal is sent to blazar-manager, the RPC messaging\nbetween API and blazar-manager stops working and users start seeing\n\"Internal Server Error\".\n\nThis issue is fixed in this patch, which adds a wait method to the\nRPCServer class and calls the wait method of the RPC server from\noslo.messaging, so that all existing requests are fulfilled before\nrestarting the blazar-manager service again.\n\nChange-Id: I8272975afeabfb74f974e9bf9a6ae9162c22a6e0\nCloses-Bug: #1807689\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/blazar/commit/e5d8c65a3691725c044117a8431c793182a2183b"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/blazar/commit/e5d8c65a3691725c044117a8431c793182a2183b"}]},"branch":"refs/heads/master"},"89bfc325caa86fd0af4eaa691d04e6772d55f588":{"kind":"TRIVIAL_REBASE","_number":3,"created":"2019-05-13 18:16:29.000000000","uploader":{"_account_id":15197,"name":"Pierre Riteau","email":"pierre@stackhpc.com","username":"priteau","status":"StackHPC"},"ref":"refs/changes/35/650635/3","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/blazar","ref":"refs/changes/35/650635/3","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/blazar refs/changes/35/650635/3 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/blazar refs/changes/35/650635/3 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/blazar refs/changes/35/650635/3 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/blazar refs/changes/35/650635/3"}}},"commit":{"parents":[{"commit":"d9d61f12c3d09d53c85968057ee6e405e5fee19c","subject":"Merge \"Fix ID of previous migration in comment\"","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/blazar/commit/d9d61f12c3d09d53c85968057ee6e405e5fee19c"}]}],"author":{"name":"asmita singh","email":"asmita.singh@nttdata.com","date":"2019-02-27 13:40:32.000000000","tz":0},"committer":{"name":"Pierre Riteau","email":"pierre@stackhpc.com","date":"2019-05-13 18:16:29.000000000","tz":0},"subject":"Handle SIGHUP signal for blazar-manager correctly","message":"Handle SIGHUP signal for blazar-manager correctly\n\nAfter a SIGHUP signal is sent to blazar-manager, the RPC messaging\nbetween API and blazar-manager stops working and users start seeing\n\"Internal Server Error\".\n\nThis issue is fixed in this patch, which adds a wait method to the\nRPCServer class and calls the wait method of the RPC server from\noslo.messaging, so that all existing requests are fulfilled before\nrestarting the blazar-manager service again.\n\nChange-Id: I8272975afeabfb74f974e9bf9a6ae9162c22a6e0\nCloses-Bug: #1807689\n","web_links":[{"name":"gitea","tooltip":"Open in 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