question Re: Is hbase snapshot valid after hfiles get deleted? in Archives of Support Questions (Read Only)

Is hbase snapshot valid after hfiles get deleted?

SandeepP — Fri, 16 Sep 2022 10:36:08 GMT

After successfully taking hbase snapshot of table, if hfiles for the table gets removed, will my snapshot be still valid?

Snapshot was taken as

hbase shell> snapshot 'tableName', 'tableSnapshot'

Soon after this, if all corresponding hfiles for the table is removed at OS level, what happens to the snapshot?

Re: Is hbase snapshot valid after hfiles get deleted?

dice — Wed, 24 Aug 2016 04:33:41 GMT

Even you hit a single host crash, the corresponding blocks are replicated
in the other hosts. That is, the hfile in the HDFS level should be safe.
Otherwise, are you running the cluster as standalone mode?

Thanks,
Dice.

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Re: Is hbase snapshot valid after hfiles get deleted?

Harsh J — Wed, 24 Aug 2016 05:41:32 GMT

A snapshot in HBase is a function of some captured metadata and associated archived HFiles covering the data. If either of these were to be permanently lost, then the snapshot would be inconsistent.

There is a snapshot info utility you can invoke on snapshot name directories to have it examine the contents:

~> hbase org.apache.hadoop.hbase.snapshot.SnapshotInfo -snapshot "NAME OF SNAPSHOT"

(For more, run with -help)

Re: Is hbase snapshot valid after hfiles get deleted?

SandeepP — Wed, 24 Aug 2016 22:14:56 GMT

Thanks.