A method and system for selecting an optimal host in a distributed system

Abstract

The invention relates to an optimal host selection method and a system in a distributed system, the method comprises the steps: step1, operating status information of each host in a host cluster at present time is collected, and a load statue evaluation value corresponding to each host is generated; step2, all operating load evaluation values form a evaluation value set which is segmented into a plurality of section evaluation values, a weight is given to each section evaluation value according to a preset rule, so that each host has a weight; step3, all hosts are sorted according to the evaluation values, and the sorted host information and the corresponding weight are put into an array; step4, all weights are summed, the obtained result is multiplied by a random number in a (0, 1) section to obtain a metric; step 5, the metric subtracts weights in the array in sequence until the difference value is not more than zero, the optimal host at present time is obtained, and the method is finished. The method and the system can make the cluster overall load be balanced.

Description

technical field [0001] The invention relates to a method and system for selecting an optimal host in a distributed system. Background technique [0002] In a distributed computing system, when a process is started and the main node host (or process) is abnormal, selecting a backup node host (or process) to take over the failed node requires the current software to select a node in a cluster composed of several hosts. The most "fit" host to run on. [0003] Since the software is deployed and run independently, the selection process is concurrent with each other. When the software only knows the current resources of the cluster, it will calculate the same "most suitable" host at the same time, resulting in this "most suitable" host. "Too much software is started on the host, and the cluster load is unbalanced. Contents of the invention [0004] The technical problem to be solved by the present invention is that, in a distributed system, when the software selects a suitable...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that, in a distributed system, when the software selects a suitable host in the host cluster to run, it is easy to cause a host to be idle at that time, so that the software that is looking for the host at the same time all selects this host, or thus It leads to the phenomenon that the overall load of the cluster is unbalanced, and provides a method and system for selecting the optimal host in a distributed system that avoids this problem when the software is concurrently looking for a host suitable for its operation.

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