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https://issues.apache.org/jira/browse/HDFS-3540?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colin Patrick McCabe updated HDFS-3540:
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Attachment: HDFS-3540-b1.004.patch
This patch integrates edit log toleration with Recovery Mode, so that both can
be turned on at the same time without interfering with one another. It also
fixes a bug where we would not do HDFS-3335-style checking of the end of the
log unless edit log toleration was enabled.
This patch also contains a small improvement to Recovery Mode: RM now prints
out the approximate remaining length of the edit log file. By this, I mean the
length of the file that remains, minus the length of the padding bytes. This
should help the system administrator get a better idea of how many bytes of
edits he is discarding if he chooses "stop reading the edit log here."
> 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
> Attachments: HDFS-3540-b1.004.patch
>
>
> *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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