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https://issues.apache.org/jira/browse/HDFS-3540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13449369#comment-13449369
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Tsz Wo (Nicholas), SZE commented on HDFS-3540:
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Hi Colin, you keep mentioning HDFS-3004 or the recovery mode feature in trunk.
However, we are talking about branch-1 recovery mode here.
> ... There's many more convincing process-based arguments. branch-1 is a
> stable branch. We should be fixing bugs, not making major changes. We should
> be trying to minimize the divergence between branch-1 and branch-2, not
> amplify it. People already know how to use recovery mode. We're not going to
> retrain people to use an (in my opinion more error-prone) system that does
> the same thing.
The branch-1 recovery mode feature is not yet released. If the new feature has
problems, we should remove it. It is not a point if people already know how to
use it. If there are people using development code, they have to get prepared
that the un-released new feature may be changed or removed.
Also, we don't not have to minimize the divergence between branch-1 and
branch-2. We usually add new features to branch-2 but not branch-1.
> Further improvement on recovery mode and edit log toleration in branch-1
> ------------------------------------------------------------------------
>
> Key: HDFS-3540
> URL: https://issues.apache.org/jira/browse/HDFS-3540
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 1.2.0
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
>
> *Recovery Mode*: HDFS-3479 backported HDFS-3335 to branch-1. However, the
> recovery mode feature in branch-1 is dramatically different from the recovery
> mode in trunk since the edit log implementations in these two branch are
> different. For example, there is UNCHECKED_REGION_LENGTH in branch-1 but not
> in trunk.
> *Edit Log Toleration*: HDFS-3521 added this feature to branch-1 to remedy
> UNCHECKED_REGION_LENGTH and to tolerate edit log corruption.
> There are overlaps between these two features. We study potential further
> improvement in this issue.
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