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https://issues.apache.org/jira/browse/HDFS-37?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hairong Kuang resolved HDFS-37.
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Resolution: Not A Problem
> An invalidated block should be removed from the blockMap
> --------------------------------------------------------
>
> Key: HDFS-37
> URL: https://issues.apache.org/jira/browse/HDFS-37
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
>
> Currently when a namenode schedules to delete an over-replicated block, the
> replica to be deleted does not get removed the block map immediately. Instead
> it gets removed when the next block report to comes in. This causes three
> problems:
> 1. getBlockLocations may return locations that do not contain the block;
> 2. Over-replication due to unsuccessful deletion can not be detected as
> described in HADOOP-4477.
> 3. The number of blocks shown on dfs Web UI does not get updated on a source
> node when a large number of blocks have been moved from the source node to a
> target node, for example, when running a balancer.
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