[PATCH] JMC-6082: JOverflow does not handle large heap dumps well

[Arvin Kangcheng Xu]

Hello all,

This patch addresses JMC-6082 (JOverflow does not handle large
heap dumps well) [0].

The problem: the dump file is closed prematurely after only a part of
the file content is pre-fetched into the cache. In case of cache
misses, subsequent reads from an already-closed file will result in a
stream closed exception.

Please see the attached patch, and let me know your thoughts. Thank
you very much!

Regards,
Kangcheng

[0] https://bugs.openjdk.java.net/browse/JMC-6082
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