Hi all,
I see in o.a.h.hdfs.server.blockmanagement.SequentialBlockIdGenerator that the
low 30 bits of the Block ID are reserved. This was set out in HDFS-4645 [1,2]:
“””
We do not change the block ID of any existing blocks on upgrade. Such existing
blocks whose IDs were randomly generated are su
Hi Ewan,
It’s not the low 30 bits that are reserved. Just the first 2^30 block IDs.
Block IDs are longs so we are unlikely to ever run out.
The choice was arbitrary and not based on likelihood of collision with earlier
block IDs.
On 8/25/16, 2:38 AM, "Ewan Higgs" wrote:
Hi all,
I s
