删除HBase中的列 [英] Deleting Columns in HBase

问题描述

在HBase中，调用DeleteColumn（）方法，即基本上对列族进行模式更改或删除列族会导致HBase Cluster停机？

解决方案

上的deleteColumn方法HBase的删除突变删除特定行中的特定列，这不是模式更改，因为HBase不保留每行的列的模式级知识（并且每行可以有不同的数目和类型列 - 认为它是一个人口稀少的矩阵）。这个对象上的deleteFamily也是如此。

不会出现集群停机时间（并且HBase实际上不会删除数据，直到该区域的下一个主要压缩）

如果你想从整个表中删除一个列族，你可以通过HBaseAdmin来完成，并且使用名称不那么恰当的 deleteColumn 方法（或者外壳与 alter'table_name'，{NAME =>'family_name'，METHOD =>'delete'} ） - 在这种情况下，表需要先禁用而HBase不会遭受宕机，具体的表格将会是

In HBase, calling DeleteColumn() method i.e., essentially a schema change to a column family or deleting column families will result in downtime of HBase Cluster?

解决方案

The deleteColumn method on a Delete mutation of HBase deletes specific column(s) from a specific row this is not a schema change since HBase does not retain a schema-level knowledge of columns of each row (and each row can have a different number and types of columns - think about it as a thinly populated matrix). The same is true for deleteFamily on this object.

There won't be a cluster downtime for this (and HBase will not actually delete the data until the next major compaction of the region)

If you want to drop a column family from the whole table you can do that via HBaseAdmin with the not so aptly named deleteColumn method (or the shell with alter 'table_name', {NAME => 'family_name', METHOD => 'delete'}) - in this case the table needs to be disabled first so while HBase won't suffer a downtime, the specific table will

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