无法删除行键 [英] cannot delete row key

问题描述

我在Cassandra中删除行键时遇到问题。每当我删除Row Key，该RowKey包含的所有列都将被删除，但RowKey本身不会被删除。任何人都可以告诉我如何删除一个rowkey，一旦它被插入columnfamily。

I'm having an issue while deleting row key in Cassandra. Whenever I delete Row Key all the columns contained by that RowKey are deleted but RowKey itself is not deleted. Can anybody tell me how to remove a rowkey, once it is inserted in columnfamily.

我期待着通过thrift客户端。

I'm looking forward to do that via thrift client.

推荐答案

这是分布式删除在Cassandra中工作的副作用。从分布式删除的Cassandra wiki页面：

This is a side effect of how distributed deletes work in Cassandra. From the Cassandra wiki page on distributed deletes:

[A]删除操作不能只是擦除立即删除的数据的所有痕迹：如果我们做了，并且副本没有收到删除操作，当它再次变得可用时，它将处理副本没有收到删除，因为错过了一个写入更新，并修复它们！因此，Cassandra不会删除删除的数据，而是使用一个称为墓碑的特殊值替换它。然后可以将墓碑传播到错过最初删除请求的副本。

[A] delete operation can't just wipe out all traces of the data being removed immediately: if we did, and a replica did not receive the delete operation, when it becomes available again it will treat the replicas that did receive the delete as having missed a write update, and repair them! So, instead of wiping out data on delete, Cassandra replaces it with a special value called a tombstone. The tombstone can then be propagated to replicas that missed the initial remove request.

另请参阅常见问题中的此问题： a href =http://wiki.apache.org/cassandra/FAQ#range_ghosts>为什么删除的键在范围扫描期间显示？

Also take a look at this question on the FAQ: Why do deleted keys show up during range scans?

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