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https://issues.apache.org/jira/browse/HDFS-1984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt Foley updated HDFS-1984:
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Summary: 1073: Enable multiple checkpointers to run simultaneously (was:
HDFS-1073: Enable multiple checkpointers to run simultaneously)
Fixed bug title for consistency with other HDFS-1073 sub-tasks.
> 1073: Enable multiple checkpointers to run simultaneously
> ---------------------------------------------------------
>
> Key: HDFS-1984
> URL: https://issues.apache.org/jira/browse/HDFS-1984
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: name-node
> Affects Versions: Edit log branch (HDFS-1073)
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: Edit log branch (HDFS-1073)
>
> Attachments: hdfs-1984.txt
>
>
> One of the motivations of HDFS-1073 is that it decouples the checkpoint
> process so that multiple checkpoints could be taken at the same time and not
> interfere with each other.
> Currently on the 1073 branch this doesn't quite work right, since we have
> some state and validation in FSImage that's tied to a single fsimage_N --
> thus if two 2NNs perform a checkpoint at different transaction IDs, only one
> will succeed.
> As a stress test, we can run two 2NNs each configured with the
> fs.checkpoint.interval set to "0" which causes them to continuously
> checkpoint as fast as they can.
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