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https://issues.apache.org/jira/browse/HDFS-12979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16855171#comment-16855171
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Konstantin Shvachko commented on HDFS-12979:
--------------------------------------------
Only suggestion I can think of for avoiding static variable
{{disableAvoidDeltaForTesting}} is to pass this information via
{{ServletContext}}:
{code:java}
nn.httpServer.getHttpServer().setAttribute("recent.image.check.enabled",
true);
{code}
Then in {{ImageServlet.doPut()}} you can extract the attribute back from the
context. It may look a bit better than having the explicit static variable.
Also would be good to use something more meaningful as the variable name,
something like {{recentImageCheckEnabled}}.
> StandbyNode should upload FsImage to ObserverNode after checkpointing.
> ----------------------------------------------------------------------
>
> Key: HDFS-12979
> URL: https://issues.apache.org/jira/browse/HDFS-12979
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs
> Reporter: Konstantin Shvachko
> Assignee: Chen Liang
> Priority: Major
> Attachments: HDFS-12979.001.patch, HDFS-12979.002.patch,
> HDFS-12979.003.patch, HDFS-12979.004.patch, HDFS-12979.005.patch,
> HDFS-12979.006.patch, HDFS-12979.007.patch, HDFS-12979.008.patch,
> HDFS-12979.009.patch, HDFS-12979.010.patch, HDFS-12979.011.patch
>
>
> ObserverNode does not create checkpoints. So it's fsimage file can get very
> old making bootstrap of ObserverNode too long. A StandbyNode should copy
> latest fsimage to ObserverNode(s) along with ANN.
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