fholzer

Summary of Behaviour:

A.   OpenJDK 7 b65.  

1.   Default in java.security is securerandom.source=/dev/urandom   
2.   If securerandom.source=/dev/urandom, NativePRNG is used, SecureRandom.nextBytes() is non-blocking via /dev/urandom ; SecureRandom.generateSeed(x) is blocking via /dev/random
3.   if securerandom.source=/dev/random, then SHA1PRNG is used.  Initial seed is blocking via /dev/random.   No other accesses.
4.   If securerandom.source=/dev/./urandom then SHA1PRNG is used.  Initial seed is non-blocking via /dev/./urandom.  No other accesses.

B.   Oracle JDK 8 b25.  

fholzer

#!/bin/bash
#
# Counts number of tombstones per partition key in one or multiple sstables.
#
# Usage: ./tombstone-count.sh /var/lib/cassandra/data/mykeyspace/mytable/*-Data.db
#
# Sample output:
#    "40e6a9839bf44bdaa624cc53e96733fe" 8
#    "8e177ab222c14f868bcb6d2922b18d2b" 8
#    "28aaa9db0dad4ae78cabe8bcc25d14a3" 9

fholzer

<#
Create Unix VM's.

PREREQUISITES:
    - A VM that has been installed with an OS that supports cloud-init
    - cloud-init is installed on the vm

How it works:
    - Asks for a bunch of parameters
    - Creates a disk from parent vhdx for speed