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## Copyright (c) 2007-2008 Facebook ## ## Licensed under the Apache License, Version 2.0 (the "License"); ## you may not use this file except in compliance with the License. ## You may obtain a copy of the License at ## ## http://www.apache.org/licenses/LICENSE-2.0 ## ## Unless required by applicable law or agreed to in writing, software ## distributed under the License is distributed on an "AS IS" BASIS, ## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. ## See the License for the specific language governing permissions and ## limitations under the License. ## ## See accompanying file LICENSE or visit the Scribe site at: ## http://developers.facebook.com/scribe/ One of the common problems we face when running scribe is that when multiple scribe servers(senders) are forwarding messages to a single scribe server(receiver) some times the receiver cannot keep up and asks the remote servers to backoff by sending a TRY_LATER. This test is used to simulate that behavior so that we can study it and improve the way scribe senders backoff. In this test we basically try to "hammer" a scribe receiver. You will need 3 servers: 2 will act as senders and 1 as receiver IMPORTANT: substitute "put_your_receiving_server_here" in hammersource.conf appropriately with you receiving server Follow the steps in order 1. On the 1st sender do $ cd scribe/test/simulatebackoff $ scribed -c hammersource.conf -p 1463 # start the scribe server 1 On another terminal window do $ sudo php new.superstress.php # create scribe clients and send to server 2 2. On the 2nd sender do $ cd scribe/test/simulatebackoff $ scribed -c hammersource.conf -p 1463 # start the scribe server 2 On another terminal window do $ sudo php new.superstress.php # create scribe clients and send to server 2 3. Wait a few minutes and let the two servers buffer messages to local disk for a while. For consistency you may wait for new.superstress.php to finish 4. On the scribe receiver $ sudo rm -rf /tmp/defaultprimary /tmp/defaultsecondary /tmp/hammerprimary /tmp/hammersecondary $ cd scribe/test/simulatebackoff $ scribed hammersink.conf # start the scribe receiver 5. Use $sudo scribe_ctrl counters 1463 on the machines to get basic counters. 6. Use some monitoring system like ganglia to study the network sent/received bytes, memory usages and disk 7. Verify that all messages sent were received. Note that you cannot use resultchecker for this because two senders are used.