Hello,

I am running a 5 node Cassandra cluster on V 3.7 and did not understand why the 
following thing was happening. I had altered the compaction strategy of a table 
from Size to Leveled and while running "nodetool compactionstats" found that 
the SSTables were stuck and not getting compacted. This was happening on 
majority of the nodes while the remaining were still showing some progress at 
compacting the SSTables.

[cid:9eca23a8-c11c-4ace-8409-5400b9d93aab]

There were no errors in system.log and a service restart also did not help. I 
reverted the compaction strategy to Size to see what happens and that sent the 
value of pending tasks back to 0.

I have done this earlier for a similar tables and it has worked perfectly fine 
for me. What could have gone wrong over here?


Thanks,

Dipan Shah

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