Get() in QuroumProtocol

anycom

于 2012-03-07 12:39:46 发布

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文章标签： redirect

本文链接：https://blog.youkuaiyun.com/anycom/article/details/7328301

本文介绍了一种名为QuorumGetTask的线程机制，该机制创建了多个线程来处理请求。其中，完整的请求被发送到主节点，而摘要请求则被发送到副本节点。请求处理涉及到复杂的QuorumResponseHandler组件，并且在节点上由QuorumProtocol.GetQuorumVerbHandler处理。

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create multiple threads named QuorumGetTask

In these threads:

the full request is sent to the First EP named master, whereas digest request is sent to the replica eps. (the difference is labeled by dpi.setReplicationStatus(true/false));

Whose responses are handled ch.ethz.systems.cloudy2.server.components.protocol.quorum.QuorumResponseHandler<Set<DPI>>(int, int, IResponseResolver<T>), which is quite complicated

//CloudyFactory.getMessaging().sendRR(m, replica, quorumResponseHandler);

In the EPS, the requests sent handled by .ch.ethz.systems.cloudy2.server.components.protocol.quorum.QuorumProtocol.GetQuorumVerbHandler

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First, if local EP is not the first EP in the preferencelist, redirect request.