AVRO-4016: [Java] Use SecureRandom for file sync markers #3016
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What is the purpose of the change
AVRO-4016: Use SecureRandom for file sync markers
Currently, sync markers are generated using an MD5 hash on a random UUID and a timestamp, but the spec simply requires a "16-byte, randomly-generated sync marker".
This change creates just that.
Verifying this change
To verify, all existing tests must continue working.
Documentation
yes/ no)docs / JavaDocs / not documented)