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From "Joydeep Sen Sarma (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3637) Support for snapshots
Date Wed, 25 Jun 2008 01:50:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12607835#action_12607835
] 

Joydeep Sen Sarma commented on HADOOP-3637:
-------------------------------------------

why are thousands of snapshots required. just curious - since most commercial products offer
couple of hundred at most - and i have never heard anyone complain.

one of my biggest concerns is irrecoverable corruption of on-disk namenode metadata and the
ability to restore to a known point in time from a backup copy of the metadata. typically
the backup image would be obtained by external software (extraneous to HDFS). It would be
good to articulate a recovery procedure for this (and this as a core requirement). (it is
understood that the backup should be more recent than the oldest snapshot for there to be
at least one available recovery point).

> Support for snapshots
> ---------------------
>
>                 Key: HADOOP-3637
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3637
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: dfs
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>
> Support HDFS snapshots. It should support creating snapshots without shutting down the
file system. Snapshot creation should be lightweight and a typical system should be able to
support a few thousands concurrent snapshots. There should be a way to surface (i.e. mount)
a few of these snapshots simultaneously.

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