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https://issues.apache.org/jira/browse/HDFS-1366?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved HDFS-1366.
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Resolution: Fixed
> reduce namenode startup time by optimising checkBlockInfo while loading
> fsimage
> ---------------------------------------------------------------------------------
>
> Key: HDFS-1366
> URL: https://issues.apache.org/jira/browse/HDFS-1366
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: dhruba borthakur
> Attachments: FSImageRead_shortcut_proto.patch
>
>
> The namenode spends about 10 minutes reading in a 14 GB fsimage file into
> memory and creating all the in-memory data structures. A jstack based
> debugger clearly shows that most of the time during the fsimage load is spent
> in BlocksMap.checkBlockInfo. There is a easy way to optimize this method
> especially for this code path.
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