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https://issues.apache.org/jira/browse/HDFS-14576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16886799#comment-16886799
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Chen Zhang commented on HDFS-14576:
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{quote}I believe there are still some points need to optimize on some
scenarios, especially for NameNode restart stage
{quote}
Yep, agree with that. Do you have any insight? I'm also very interested in it.
> Avoid block report retry and slow down namenode startup
> -------------------------------------------------------
>
> Key: HDFS-14576
> URL: https://issues.apache.org/jira/browse/HDFS-14576
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: He Xiaoqiao
> Assignee: He Xiaoqiao
> Priority: Major
>
> During namenode startup, the load will be very high since it has to process
> every datanodes blockreport one by one. If there are hundreds datanodes block
> reports pending process, the issue will be more serious even
> #processFirstBlockReport is processed a lot more efficiently than ordinary
> block reports. Then some of datanode will retry blockreport and lengthens
> restart times. I think we should filter the block report request (via
> datanode blockreport retries) which has be processed and return directly then
> shorten down restart time. I want to state this proposal may be obvious only
> for large cluster.
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