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https://issues.apache.org/jira/browse/FLUME-1516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13613167#comment-13613167
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Brock Noland commented on FLUME-1516:
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Job failed with:
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[ERROR] BUILD ERROR
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[INFO] Error getting reports from the plugin
'org.tomdz.maven:sphinx-maven-plugin:1.0.2': Unable to load the mojo
'org.tomdz.maven:sphinx-maven-plugin:1.0.2:generate' in the plugin
'org.tomdz.maven:sphinx-maven-plugin'. A required class is missing:
org/codehaus/plexus/util/xml/XmlStreamWriter
org.codehaus.plexus.util.xml.XmlStreamWriter
[INFO] ------------------------------------------------------------------------
[INFO] For more information, run Maven with the -e switch
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 39 seconds
[INFO] Finished at: Mon Mar 25 21:23:56 UTC 2013
[INFO] Final Memory: 74M/638M
[INFO] ------------------------------------------------------------------------
{noformat}
> Write Dual Checkpoints to avoid replays
> ---------------------------------------
>
> Key: FLUME-1516
> URL: https://issues.apache.org/jira/browse/FLUME-1516
> Project: Flume
> Issue Type: New Feature
> Components: Channel
> Affects Versions: v1.3.0
> Reporter: Brock Noland
> Assignee: Hari Shreedharan
> Fix For: v1.4.0
>
> Attachments: DualCheckpoints.pdf, DualCheckpointsv2.pdf,
> DualCheckpointsv3.pdf, FLUME-1516-1.patch, FLUME-1516-2.patch,
> FLUME-1516-3.patch, FLUME-1516-4.patch, FLUME-1516-5.patch,
> FLUME-1516-6.patch, FLUME-1516.patch
>
>
> Per the LFS paper (http://www.cs.berkeley.edu/~brewer/cs262/LFS.pdf) we can
> write two checkpoints to avoid replaying the logs in the case we
> crash/shutdown while writing a checkpoint.
> Section 4:
> "In order to handle a crash during a checkpoint operation there are actually
> two checkpoint regions, and checkpoint operations alternate between them. The
> checkpoint time is in the last block of the checkpoint so if the checkpoint
> fails the time will not be updated. During reboot, the system reads both
> checkpoint regions and uses the one with the most recent time."
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