Jiayi Liu created RANGER-2700:
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Summary: creating service sometimes fails because
SecureRandom.getInstanceStrong() is very slow
Key: RANGER-2700
URL: https://issues.apache.org/jira/browse/RANGER-2700
Project: Ranger
Issue Type: Improvement
Components: admin
Affects Versions: ranger-2.0
Reporter: Jiayi Liu
I try to install ranger-2.0.0 on my cluster, however when I try to create a new
service in WebUI, I often get an error that createService failed. I try to
debug through the source code, and found that it stuck on
generateBase64EncodedIV() in PasswordUtils.java. It uses
SecureRandom.getInstanceStrong() to get the random byte array. We can find a
lot of information showing that this function often blocks and is very slow.
SecureRandom.getInstanceStrong() uses /dev/random, and /dev/random blocks the
thread if there isn't enough randomness available, but /dev/urandom will never
block. SecureRandom.getInstanceStrong() is equivalent to
SecureRandom.getInstance("NativePRNGBlocking"), and we can use /dev/urandom by
replacing ecureRandom.getInstanceStrong() to
SecureRandom.getInstance("NativePRNGNonBlocking"). /dev/random and /dev/urandom
use the same pool of randomness under the hood, and they are equally secure.
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