Thank you for your response. As you said, the auto_bootstrap setting was turned on. The actual data was deleted with the 'nodetool clearsnapshot' command. This command seems to apply only to one node. Can it be applied cluster-wide? Or should I run this command on each node?
> On 12 Jan 2018, at 8:10 PM, Alain RODRIGUEZ <arodr...@gmail.com> wrote: > > Hello, > > However, the actual size of the data directory did not decrease at all. Disk > Load monitored by JMX has been decreased. > > This sounds like 'auto_snapshot' is enabled. This option will trigger a > snapshot before any table drop / truncate to prevent user mistakes mostly. > Then the data is removed but as it is still referenced by the snapshot (hard > link), space cannot be freed. > > Running 'nodetool clearsnapshot' should help reducing the dataset size in > this situation. > > > The client fails to establish a connection and I see the following exceptions > in the Cassandra logs. > org.apache.cassandra.db.UnknownColumnFamilyException: Couldn't find table for > cfId… > > This does not look like a failed connection to me but rather a try to query > some inexistent data. If that's the data you just deleted (keyspace / table), > this is expected. If not there is an other issue, I hope not related to the > delete in this case... > > C*heers, > ----------------------- > Alain Rodriguez - @arodream - al...@thelastpickle.com > <mailto:al...@thelastpickle.com> > France / Spain > > The Last Pickle - Apache Cassandra Consulting > http://www.thelastpickle.com <http://www.thelastpickle.com/> > > > > 2018-01-12 7:14 GMT+00:00 Eunsu Kim <eunsu.bil...@gmail.com > <mailto:eunsu.bil...@gmail.com>>: > hi everyone > > On the development server, I dropped all the tables and even keyspace dropped > to change the table schema. > Then I created the keyspace and the table. > > However, the actual size of the data directory did not decrease at all. Disk > Load monitored by JMX has been decreased. > > <Screen Shot 2018-01-12 at 3.50.22 PM.png> > > > After that, Cassandra does not work normally. > > The client fails to establish a connection and I see the following exceptions > in the Cassandra logs. > > org.apache.cassandra.db.UnknownColumnFamilyException: Couldn't find table for > cfId…….org.apache.cassandra.io.FSReadError: java.io.IOException: Digest > mismatch exception…… > > > After the data is forcibly deleted, Cassandra is restarted in a clean state > and works well. > > Can anyone guess why this is happening? > > Thank you in advance. >
