IndexReader's add/removeCloseListener should not use ConcurrentHashMap, just a
synchronized set
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Key: LUCENE-3656
URL: https://issues.apache.org/jira/browse/LUCENE-3656
Project: Lucene - Java
Issue Type: Bug
Components: core/index
Affects Versions: 3.5, 4.0
Reporter: Uwe Schindler
Assignee: Uwe Schindler
Priority: Minor
The use-case for ConcurrentHashMap is when many threads are reading and less
writing to the structure. Here this is just funny: The only reader is close().
Here you can just use a synchronized HashSet. The complexity of CHM is making
this just a joke :-)
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