HBase Snapshot

Neelesh — Fri, 16 Sep 2022 10:45:03 GMT

Dear experts,

1. Is the Hbase snapshot take only pointer of table or it make copy of entire hbase table.

2. What export snapshot does in hbase.

3. Is hbase snapshot allow in cloudera express version.

Re: HBase Snapshot

Harsh J — Fri, 21 Oct 2016 06:11:15 GMT

> 1. Is the Hbase snapshot take only pointer of table or it make copy of entire hbase table.

Within the cluster the snapshot is only an increase in metadata ('pointer' as you mention) where the HFiles carrying the data are not copied but are moved to a special location where they are kept for the life of the snapshot existing.

> 2. What export snapshot does in hbase.

Exporting a snapshot allows you to make an actual, full-data physical copy of the data to another storage/HBase cluster.

> 3. Is hbase snapshot allow in cloudera express version.

Snapshots by themselves are a feature offered by Apache HBase itself. It comes with your 100% Open Source CDH and is always available for use regardless of your Cloudera Manager version/edition. This would cover all the Snapshot information presented at http://archive.cloudera.com/cdh5/cdh/5/hbase/book.html#ops.snapshots

With Cloudera Manager Enterprise, however, you gain the additional abilities to schedule HBase Snapshots and schedule exports of these Snapshots to S3-compliant storages as described at http://www.cloudera.com/documentation/enterprise/latest/topics/cm_bdr_managing_hbase_snapshots.html

For (1) and (2) I'd recommend reading also (in-full) the older but still relevant blog post of https://blog.cloudera.com/blog/2013/03/introduction-to-apache-hbase-snapshots/

Re: HBase Snapshot

Neelesh — Mon, 24 Oct 2016 10:18:10 GMT

Harsh,

Could you clarify answer for point no.1

1. Whether hbase snapshot make another copy of the table or not.

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