Hello Cassandra-users, I logged into my test Cassandra cluster and saw this today. I find it very unusual that a set of SSTables have the same set of ancestors:
$ sstablemetadata b800ks3-colla1-ka-*-Statistics.db | grep "Ancestors\|SSTable:" SSTable: ./b800ks3-colla1-ka-1876 Ancestors: [1840, 1745, 1827, 1782, 1862, 1863, 1864, 1865, 1849, 1407] SSTable: ./b800ks3-colla1-ka-2419 Ancestors: [2417, 2418, 2373, 2374, 2375, 2376, 2377, 2378] SSTable: ./b800ks3-colla1-ka-2420 Ancestors: [2417, 2418, 2373, 2374, 2375, 2376, 2377, 2378] SSTable: ./b800ks3-colla1-ka-2421 Ancestors: [2417, 2418, 2373, 2374, 2375, 2376, 2377, 2378] SSTable: ./b800ks3-colla1-ka-2422 Ancestors: [2417, 2418, 2373, 2374, 2375, 2376, 2377, 2378] SSTable: ./b800ks3-colla1-ka-2423 Ancestors: [2417, 2418, 2373, 2374, 2375, 2376, 2377, 2378] SSTable: ./b800ks3-colla1-ka-2424 Ancestors: [2417, 2418, 2373, 2374, 2375, 2376, 2377, 2378] SSTable: ./b800ks3-colla1-ka-2425 Ancestors: [2417, 2418, 2373, 2374, 2375, 2376, 2377, 2378] SSTable: ./b800ks3-colla1-ka-2430 Ancestors: [2428, 2429] What could have potentially caused this ? Nobody has run a sstablesplit on any of these SSTables and I do not see any "anticompaction" words in the log file. Thank you ! Regards, Rajath ------------------------ Rajath Subramanyam