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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-4540) An invalidated block should be removed from the blockMap
Date Wed, 29 Oct 2008 22:02:44 GMT
An invalidated block should be removed from the blockMap

                 Key: HADOOP-4540
                 URL: https://issues.apache.org/jira/browse/HADOOP-4540
             Project: Hadoop Core
          Issue Type: Bug
          Components: dfs
    Affects Versions: 0.18.0
            Reporter: 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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