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https://issues.apache.org/jira/browse/HDFS-9787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15140384#comment-15140384
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Jesse Yates commented on HDFS-9787:
-----------------------------------
The original solution was an attempting to catch the case where we don't flood
the NN with checkpoint requests. Instead, maybe the better solution would be to
do a small RPC to see when the latest image was uploaded. If it was uploaded
the quietMultiplier beyond the checkpoint period, then we attempt to upload the
checkpoint.
Its a bit more work, but I think this more clearly lays out the intentions in
the code, rather than obtaining the same effect, but without the overhead of
actually sending the checkpoint along each time we want to find out if its
behind.
> SNNs stop uploading FSImage to ANN once isPrimaryCheckPointer changed to
> false.
> -------------------------------------------------------------------------------
>
> Key: HDFS-9787
> URL: https://issues.apache.org/jira/browse/HDFS-9787
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ha
> Affects Versions: 3.0.0
> Reporter: Guocui Mi
> Assignee: Guocui Mi
> Attachments: HDFS-9786-v000.patch
>
>
> SNNs stop uploading FSImage to ANN once isPrimaryCheckPointer become false.
> Here is the logic to check if upload FSImage or not.
> In StandbyCheckpointer.java
> boolean sendRequest = isPrimaryCheckPointer || secsSinceLast >=
> checkpointConf.getQuietPeriod();
> doCheckpoint(sendRequest);
> The sendRequest is always false if isPrimaryCheckPointer is false giving
> secsSinceLast (~checkpointPeriod) >= checkpointConf.getQuietPeriod()
> (checkpointPeriod * this.quietMultiplier(default value 1.5)) always returns
> false.
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