Convert FSImage.removedStorageDirs into a map.
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Key: HADOOP-5619
URL: https://issues.apache.org/jira/browse/HADOOP-5619
Project: Hadoop Core
Issue Type: Improvement
Components: dfs
Affects Versions: 0.21.0
Reporter: Konstantin Shvachko
Fix For: 0.21.0
{{FSImage.removedStorageDirs}} is declared as an {{ArrayList}}. In order to
avoid adding the same directory twice into {{removedStorageDirs}} we should
convert it into a map.
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