269a4ef11e
Cloudstack sends requests to directly managed HV hosts (direct agents) using the direct agent thread pool. The size of the pool is determined by global config direct.agent.pool.size defaulted to 500. Currently there is no restriction on the number of threads a direct agent can use from this shared thread pool to send requests to the host. This is fine as long as the host is responding to requests in a reasonable amount of time. But if there is a considerable delay in getting response, the thread remain blocked for that much time. As more commands are send to the slow host threads keep getting blocked. This can eventually lead to a situation where requests to healthy hosts cannot be processed as there are not enough free threads. The problem being addressed here is to localize the impact of few bad hosts, so that entire management server is not affected. One such way is to throttle based on the # of outstanding requests on per host basis. The outstanding requests to a host will be a % of direct agent pool size. This is configurable based on direct.agent.thread.cap. The default value is 0.1 or 10%, a value of 1 would mean the old behavior where there is no upper cap. This will ensure that the impacted host will be bound by a upper cap on the number of threads it can use to process requests and not the entire pool. |
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| agent | ||
| agent-simulator/tomcatconf | ||
| api | ||
| awsapi | ||
| awsapi-setup | ||
| build | ||
| client | ||
| cloud-cli | ||
| core | ||
| debian | ||
| deps | ||
| developer | ||
| docs/.tx | ||
| engine | ||
| framework | ||
| maven-standard | ||
| packaging | ||
| plugins | ||
| python | ||
| quickcloud | ||
| scripts | ||
| server | ||
| services | ||
| setup | ||
| systemvm | ||
| test | ||
| tools | ||
| ui | ||
| usage | ||
| utils | ||
| vmware-base | ||
| .gitignore | ||
| CHANGES | ||
| INSTALL.md | ||
| LICENSE | ||
| NOTICE | ||
| README.md | ||
| README.tools.md | ||
| configure-info.in | ||
| pom.xml | ||
| version-info.in | ||
README.md
Apache CloudStack Version 4.2.0
About Apache CloudStack
Apache CloudStack is software designed to deploy and manage large networks of virtual machines, as a highly available, highly scalable Infrastructure as a Service (IaaS) cloud computing platform. CloudStack is used by a number of service providers to offer public cloud services, and by many companies to provide an on-premises (private) cloud offering.
Apache CloudStack currently supports the most popular hypervisors: VMware, Oracle VM, KVM, XenServer and Xen Cloud Platform. CloudStack also offers bare metal management of servers, using PXE to provision OS images and IPMI to manage the server. Apache CloudStack offers three methods for managing cloud computing environments: an easy to use Web interface, command line tools, and a full-featured RESTful API.
Visit us at Apache CloudStack.
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License
Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you 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.
Building CloudStack
See the INSTALL file.
Notice of Cryptographic Software
This distribution includes cryptographic software. The country in which you currently reside may have restrictions on the import, possession, use, and/or re-export to another country, of encryption software. BEFORE using any encryption software, please check your country's laws, regulations and policies concerning the import, possession, or use, and re-export of encryption software, to see if this is permitted. See http://www.wassenaar.org/ for more information.
The U.S. Government Department of Commerce, Bureau of Industry and Security (BIS), has classified this software as Export Commodity Control Number (ECCN) 5D002.C.1, which includes information security software using or performing cryptographic functions with asymmetric algorithms. The form and manner of this Apache Software Foundation distribution makes it eligible for export under the License Exception ENC Technology Software Unrestricted (TSU) exception (see the BIS Export Administration Regulations, Section 740.13) for both object code and source code.
The following provides more details on the included cryptographic software:
CloudStack makes use of JaSypt cryptographic libraries
CloudStack has a system requirement of MySQL, and uses native database encryption functionality.
CloudStack makes use of the Bouncy Castle general-purpose encryption library.
CloudStack can optionally interacts with and controls OpenSwan-based VPNs.
CloudStack has a dependency on Apache WSS4J as part of the AWSAPI implementation.
CloudStack has a dependency on and makes use of JSch - a java SSH2 implementation.