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https://issues.apache.org/jira/browse/HBASE-8352?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ted Yu updated HBASE-8352:
--------------------------
Release Note:
In order to avoid name collision with hdfs snapshot, ".snapshot" under HBase
root directory must be renamed as ".hbase-snapshot" before deployment of 0.94.7
or later release is started.
Don't do rolling upgrade between 0.94.6.1 and 0.94.7 if there're on-going
snapshots activities.
Sequence of actions should be:
1. make sure all on-going snapshots activities have completed
2. shutdown all the masters and upgrade them to 0.94.7+ release
3. rename ".snapshot" under HBase root directory as ".hbase-snapshot" (You now
can perform clone or restore, but not taking snapshots)
4. upgrade the region servers
(You should not take snapshots until all the regions server are aligned to
0.94.7+ release)
If you take a snapshot during the RS upgrades nothing critical happens. The
".snapshot" folder would appear again and the snapshot will fail since half of
the data will be in ".hbase-snapshot" and the other half in ".snapshot"
was:
In order to avoid name collision with hdfs snapshot, ".snapshot" under HBase
root directory must be renamed as ".hbase-snapshot" before deployment of 0.94.7
or later release is started.
Don't do rolling upgrade between 0.94.6.1 and 0.94.7 if there're on-going
snapshots activities.
Sequence of actions should be:
1. make sure all on-going snapshots activities have completed
2. all the RSs and Masters must be aligned to 0.94.7+ release
3. rename ".snapshot" under HBase root directory as ".hbase-snapshot"
4. perform upgrade
> Rename '.snapshot' directory
> ----------------------------
>
> Key: HBASE-8352
> URL: https://issues.apache.org/jira/browse/HBASE-8352
> Project: HBase
> Issue Type: Bug
> Reporter: Ted Yu
> Assignee: Ted Yu
> Priority: Critical
> Fix For: 0.98.0, 0.94.7, 0.95.1
>
> Attachments: 8352-0.94-v1.txt, 8352-trunk.txt
>
>
> Testing HBase Snapshot on top of Hadoop's Snapshot branch
> (http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-2802/), we found
> that both features used '.snapshot' directory to store metadata.
> HDFS (built from HDFS-2802 branch) doesn't allow paths with .snapshot as a
> component
> From discussion on [email protected], (see
> http://search-hadoop.com/m/kY6C3cXMs51), consensus was to rename '.snapshot'
> directory in HBase so that both features can co-exist smoothly.
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