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https://issues.apache.org/jira/browse/HDFS-5376?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colin Patrick McCabe updated HDFS-5376:
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Issue Type: Wish (was: Sub-task)
Parent: (was: HDFS-4949)
> Incremental rescanning of cached blocks and cache entries
> ---------------------------------------------------------
>
> Key: HDFS-5376
> URL: https://issues.apache.org/jira/browse/HDFS-5376
> Project: Hadoop HDFS
> Issue Type: Wish
> Components: namenode
> Affects Versions: HDFS-4949
> Reporter: Andrew Wang
> Assignee: Andrew Wang
>
> {{CacheReplicationMonitor#rescan}} is invoked whenever a new cache entry is
> added or removed. This involves a complete rescan of all cache entries and
> cached blocks, which is potentially expensive. It'd be better to do an
> incremental scan instead. This would also let us incrementally re-scan on
> namespace changes like rename and create for better caching latency.
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