SequenceFile sync marker uniqueness

2013-05-23 Thread John Lilley
How does SequenceFile guarantee that the sync marker does not appear in the data? John

Re: SequenceFile sync marker uniqueness

2013-05-23 Thread Harsh J
SequenceFiles use a 16 digit MD5 (computed based on a UID and writer ~init time, so pretty random). For the rest of my answer, I'll prefer not to repeat what Martin's already said very well here: http://search-hadoop.com/m/VYVra2krg5t1 (point #2) over the Avro lists for the Avro DataFile format