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https://issues.apache.org/jira/browse/HADOOP-11892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15238316#comment-15238316
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Andrew Wang commented on HADOOP-11892:
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As a correction, /dev/urandom doesn't block. Concerns about running out of
entropy are often exaggerated, since you only need a few bits of entropy to
generate a lot of randomness, and only at system startup. See:
http://www.2uo.de/myths-about-urandom/
> CryptoCodec#getInstance always returns a new instance of CryptoCodec. This
> could be expensive
> ---------------------------------------------------------------------------------------------
>
> Key: HADOOP-11892
> URL: https://issues.apache.org/jira/browse/HADOOP-11892
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.7.0
> Reporter: Arun Suresh
> Assignee: Arun Suresh
>
> {{CryptoCodec#getInsatnce}} should be able to return possibly cached
> instances of the CryptoCodec implementation as instantiating a new instance
> every time could be expensive
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