Found while reviewing for
After the patch, the output of metaSave is:
Live Datanodes: 0
Dead Datanodes: 0
Metasave: Blocks waiting for reconstruction: 0
Metasave: Blocks currently missing: 1
file16387: blk_0_1 MISSING (replicas: l: 0 d: 0 c: 2 e: 0) 18.104.22.168:9866(corrupt) (block deletions maybe out of date) : 22.214.171.124:9866(corrupt) (block deletions maybe out of date) :
Mis-replicated blocks that have been postponed:
Metasave: Blocks being reconstructed: 0
Metasave: Blocks 0 waiting deletion from 0 datanodes.
Block=0 Node=126.96.36.199:9866 StorageID=s1 StorageState=NORMAL TotalReplicas=2 Reason=GENSTAMP_MISMATCH
Block=0 Node=188.8.131.52:9866 StorageID=s2 StorageState=NORMAL TotalReplicas=2 Reason=GENSTAMP_MISMATCH
Metasave: Number of datanodes: 0
Looking at the output
The output is not user friendly — The meaning of "(replicas: l: 0 d: 0 c: 2 e: 0)" is not obvious without looking at the code.
Also, it should print maintenance mode replicas.