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https://issues.apache.org/jira/browse/HDFS-3137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13241941#comment-13241941
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Eli Collins commented on HDFS-3137:
-----------------------------------
Thanks Nicholas!
Btw I verified an upgrade from a populated (both image and logs) 18.3 install
upgrade successfully to a trunk build (3.0-SNAPSHOT) with this change:
{noformat}
2012-03-29 16:50:05,947 INFO org.apache.hadoop.hdfs.server.namenode.FSImage: Sta
rting upgrade of image directory /home/eli/hadoop/dirs3/name.
old LV = -16; old CTime = 0.
new LV = -40; new CTime = 1333065005946
...
2012-03-29 16:50:06,003 INFO org.apache.hadoop.hdfs.server.namenode.FSImage:
Upgrade of /home/eli/hadoop/dirs3/name is complete.
{noformat}
> Bump LAST_UPGRADABLE_LAYOUT_VERSION
> -----------------------------------
>
> Key: HDFS-3137
> URL: https://issues.apache.org/jira/browse/HDFS-3137
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Reporter: Eli Collins
> Assignee: Eli Collins
> Attachments: hdfs-3137.txt, hdfs-3137.txt, hdfs-3137.txt
>
>
> LAST_UPGRADABLE_LAYOUT_VERSION is currently -7, which corresponds to Hadoop
> 0.14. How about we bump it to -16, which corresponds to Hadoop 0.18?
> I don't think many people are using releases older than v0.18, and those who
> are probably want to upgrade to the latest stable release (v1.0). To upgrade
> to eg 0.23 they can still upgrade to v1.0 first and then upgrade again from
> there.
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