hbase复制和快照命令之间的区别 [英] diffrence between hbase copy and snapshot command

问题描述

我在hbase中有一个包含大量数据的表，所以我希望在这种情况下使用表的背面，这是很好的

1--复制命令以获取表格的备份
2 - 获取该表格的快照

还请解释快照的内部机制是简单的重命名表？

问候
Amit

解决方案

快照最好。

• HBase快照允许您在不影响Region Server的情况下拍摄表的快照。快照，克隆和恢复操作不涉及数据复制。另外，将快照导出到另一个群集不会影响Region Server。

在版本0.94.6之前，唯一的备份或克隆表的方法是使用CopyTable / ExportTable，或者在禁用表后复制HDFS中的所有hfiles。这些方法的缺点是可能会降低区域服务器的性能（复制/导出表），或者您需要禁用表，这意味着无法读取或写入;这通常是不可接受的。

• 快照不仅仅是在多个操作之间进行重命名，如果你想在一个特定的点恢复，那么这是正确的使用方法：
  快照是一组元数据信息，允许管理员恢复到表格的先前状态。快照不是表格的副本;它只是一个文件名列表，不会复制数据。完整的快照恢复意味着您可以恢复到之前的表格模式，您将恢复以前的数据，并丢失自拍摄快照以来所做的任何更改。

另请参阅快照+和+可重复+读取+ HBase +表格

Snapshot Internals

I have a table in hbase which contain a huge amount of data I want to take the back of the table so in this situation which is good

1--Copy command to take the back up of the table 2--Take the snapshot of that table

And also please explain the internal mechanism of snapshot Is it simply renaming the table?

Regards Amit

解决方案

snapshot is best.

• HBase Snapshots allow you to take a snapshot of a table without too much impact on Region Servers. Snapshot, Clone and restore operations don't involve data copying. Also, Exporting the snapshot to another cluster doesn't have impact on the Region Servers.

Prior to version 0.94.6, the only way to backup or to clone a table is to use CopyTable/ExportTable, or to copy all the hfiles in HDFS after disabling the table. The disadvantages of these methods are that you can degrade region server performance (Copy/Export Table) or you need to disable the table, that means no reads or writes; and this is usually unacceptable.

• Snapshot is not just rename, between multiple operations if you want to restore at one particular point then this is the right case to use : A snapshot is a set of metadata information that allows an admin to get back to a previous state of the table. A snapshot is not a copy of the table; it’s just a list of file names and doesn’t copy the data. A full snapshot restore means that you get back to the previous "table schema" and you get back your previous data losing any changes made since the snapshot was taken.

Also, see Snapshots+and+Repeatable+reads+for+HBase+Tables

Snapshot Internals

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