google cloud bigtable列版本未删除

Question

我们在 cloud bigtable 中创建了一个 table 具有两个列族。一个列族有 30 个版本，另一个列族有 1 个版本。但是，当我们查询 table 时，我们将获得我们已将最大版本数设置为 1 的列的多个版本。

Table 创建语句：

create 'myTable', {NAME => 'cf1', VERSIONS => '30'}, {NAME => 'cf2', VERSIONS => '1'}


Describe 'myTable':

{NAME => ‘cf2’, BLOOMFILTER => ‘ROW’, VERSIONS => ‘**1**’, IN_MEMORY => ‘false’, KEEP_DELETED_CELLS => ‘FALSE’, DATA_BLOCK_ENCODING => ‘NONE’, TTL => ‘FOREVER’, COMPRESSION => ‘NONE’, MIN_VERSIONS => ‘0’, BLOCKCACHE => ‘true’, BLOCKSIZE => ‘65536’, REPLICATION_SCOPE
 => ‘0’}                                                                                                                                                                                                                                                                        
{NAME => ‘cf1’, BLOOMFILTER => ‘ROW’, VERSIONS => ‘**30**’, IN_MEMORY => ‘false’, KEEP_DELETED_CELLS => ‘FALSE’, DATA_BLOCK_ENCODING => ‘NONE’, TTL => ‘FOREVER’, COMPRESSION => ‘NONE’, MIN_VERSIONS => ‘0’, BLOCKCACHE => ‘true’, BLOCKSIZE => ‘65536’, REPLICATION_SCOPE
 => ‘0’}

大table 垃圾收集是如何工作的？它多久删除一次旧版本？还是我们在创建 table 时遗漏了什么？

Answer 1

来自 Bigtable 文档：值的删除在后台随机发生，因此您可能仍然可以在数据过期后几天内读取数据.

Link to docs

Even more detailed explanation

google cloud bigtable列版本未删除

google cloud bigtable column versions are not deleted

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