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https://issues.apache.org/jira/browse/HDFS-1521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12971944#action_12971944
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Todd Lipcon commented on HDFS-1521:
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test-patch also passes:
[exec] +1 overall.
[exec]
[exec] +1 @author. The patch does not contain any @author tags.
[exec]
[exec] +1 tests included. The patch appears to include 21 new or
modified tests.
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[exec] +1 javadoc. The javadoc tool did not generate any warning
messages.
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[exec] +1 javac. The applied patch does not increase the total number
of javac compiler warnings.
[exec]
[exec] +1 findbugs. The patch does not introduce any new Findbugs
(version 1.3.9) warnings.
[exec]
[exec] +1 release audit. The applied patch does not increase the
total number of release audit warnings.
[exec]
[exec] +1 system test framework. The patch passed system test
framework compile.
> Persist transaction ID on disk between NN restarts
> --------------------------------------------------
>
> Key: HDFS-1521
> URL: https://issues.apache.org/jira/browse/HDFS-1521
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Affects Versions: 0.22.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: 0.22.0
>
> Attachments: hdfs-1521.3.txt, hdfs-1521.4.txt, hdfs-1521.txt,
> hdfs-1521.txt
>
>
> For HDFS-1073 and other future work, we'd like to have the concept of a
> transaction ID that is persisted on disk with the image/edits. We already
> have this concept in the NameNode but it resets to 0 on restart. We can also
> use this txid to replace the _checkpointTime_ field, I believe.
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