Instances of the GAE development web-server, dev_appserver.py are deployed on multiple virtual machines as an AppScale application server (AS) component. Since the datastore included with dev_appserver.py is a local file-based implementation that emulates the actual Google datastore APIs, this component is modified in AppScale so as to connect to a Hadoop HBase+HDFS deployment. (Recall that HBase and HDFS are open source implementations of Google’s BigTable and GFS architectures.) Therefore, AppScale also includes a collection of database server (DBS) components on a number of virtual machines on which HBase and HDFS run (these virtual machines can be the same ones on which AS components are deployed). Each AppScale node also runs an application controller (AC) that controls the AppScale components deployed on it.html
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做者:Petter Liu
出处:http://www.cnblogs.com/wintersun/
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