dingshun3016 commented on PR #5170:
URL: https://github.com/apache/hadoop/pull/5170#issuecomment-1333710803
according to the situation discussed so far, it seems that there are several
ways to solve this problem
- remove the BLOCK_POOl level write lock in #addBlockPool
> but worry about having replica consistency problem
- forbid refresh() when ReplicaCachingGetSpaceUsed#init() at first time
> it will cause the value of dfsUsage to be 0 until the next time
refresh()
- use du or df command instead at first time
> du is very expensive and slow
> df is inaccurate when the disk sharing by other servers
reference
[HDFS-14313](https://issues.apache.org/jira/browse/HDFS-14313)
Now that, this case only happen when invoke addBlockPool() and
CachingGetSpaceUsed#used < 0, I have an idea, is it possible to add a switch,
not add lock when ReplicaCachingGetSpaceUsed#init() at first time , and add it
at other times
do you think it's possible？@MingXiangLi
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