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https://issues.apache.org/jira/browse/HDFS-1147?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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dhruba borthakur resolved HDFS-1147.
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Resolution: Duplicate
> Reduce NN startup time by reducing the processing time of block reports
> -----------------------------------------------------------------------
>
> Key: HDFS-1147
> URL: https://issues.apache.org/jira/browse/HDFS-1147
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
>
> The NameNode restart times are impacted to a large extent by the processing
> time of block reports. For a cluster with 150 millions blocks, the block
> report processing in the NN can take upto 20 minutes or so. The NN is open
> for business only after it has processed the block reports from most of the
> datanodes. If we can reduce the processing time of a block report, that will
> directly reduce the restart time of the NN.
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