saintstack commented on pull request #2274:
URL: https://github.com/apache/hbase/pull/2274#issuecomment-676559559


   ```
   Could this really solve the problem?
   ```
   
   Problem is hard to reproduce.
   
   Reasoning, this patch shoud reduce likelihood of our encountering this 
static loading lockup.
   
   ```
   ....That is, just move the UNDEFINED field to RegionInfoBuilder. I know this 
breaks the IA.Public rule, so maybe we just leave 2.3.x as is, since this is 
not easy to reproduce and does not cause any data loss. Let's make it clean on 
2.4+.
   ```
   
   Yeah, breaks the IA.Public -- hence this patch which does not break 
IA.Public.
   
   Following the rules, we can't move UNDEFINED till 4.0 -- not 2.4. A server 
hung in this manner where all priority handlers are jammed up but heartbeating, 
etc. keeps 'working' broke the cluster; the operator ended up doing cluster 
restart... Disruptive.
   
   Would like to land a workaround/fix for 2.3+.
   
   Perhaps you prefer the first patch which just deprecated UNDEFINED setting 
it to null so as not to reference RegionInfoBuilder?
   
   @Apache9 
   
   Thanks


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