They use Hadoop to process massive batch workloads, taking their Hadoop cluster down for upgrades periodically, whereas their Voldemort servers never go down.

他们使用Hadoop来处理大块的批数据，这样其Hadoop集群就需要周期性地进行升级，但Voldemort则永远不需要。

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All nodes in the cluster must be brought down in order to upgrade to the next release level.

为了升级到下一个发布版本，集群中的所有节点都必须停止运作。

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The session data also needs to be replicated to other cluster nodes, in case the original cluster node goes down (failover scenario).

如果原始集群节点出现问题(故障转移情况)，则会话数据还必须复制到其他的集群节点。

youdao

If I get you down to a cluster of about 30 water molecules, the boiling point is a function of the size of the water droplet.

如果对于一个由30个水分子,组成的簇，沸点是,水珠尺寸的函数。

麻省理工公开课 - 固态化学导论课程节选

The whale rose about 5ft above the water, showing a sliver of its back and a cluster of cream coloured barnacles, and then dove back down.

BBC: A wild world off California's coast

Fitted with curved guiderails, the sodbreaker lifted the newly liberated sod cluster and turned it so that the sod ribbon would gently plop upside down, ready for settlers to slice it into individual sections weighing about 100 pounds (45kg) each.

ECONOMIST: Building houses