prashantpogde commented on pull request #1480:
URL: https://github.com/apache/hadoop-ozone/pull/1480#issuecomment-705775239
General comment on using the epoch id that increments with every OM restart.
This can get tricky.
If OM goes in crash restart loop then we have just 2^16 increments
available which is 65K attempts. if it takes 1 secs for OM to comeback online
we have 65 K secs worth epoch number or 20 hours of crash looping. This is very
pessimistic view, it may take several seconds for OM to restart but it does
show how
- 16 bit space can be insufficient for this scheme.
- epoch need not be dependent on restart based increment. if it increments
based on both of the following conditions
A) OM restart +
B) some object gets created after epoch id is incremented
then epoch may last longer. But even then 16 bit looks insufficient. What
if OM creates one object and restarts.
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