Fwd: How default_time_to_live would delete rows without tombstones in Cassandra?

From https://docs.datastax.com/en/cassandra/3.0/cassandra/dml/dmlAboutDeletes.html > Cassandra allows you to set a default_time_to_live property for an entire table. Columns and rows marked with regular TTLs are processed as described above; but when a record exceeds the table-level TTL, **Cassand

TTL tombstones in Cassandra using LCS are cretaed in the same level data TTLed data?

I'm using LCS and a relatively large TTL of 2 years for all inserted rows and I'm concerned about the moment at wich C* would drop the corresponding tombstones (neither explicit deletes nor updates are being performed). >From [Missing Manual for Leveled Compaction Strategy]( https://www.youtube.co

Re: How default_time_to_live would delete rows without tombstones in Cassandra?

>> scenario to using TTL per insert? >> > > Yes, exactly this, > > C*heers. > --- > Alain Rodriguez - @arodream - al...@thelastpickle.com > France / Spain > > The Last Pickle - Apache Cassandra Consulting > http://www.thelastpickl

Re: TTL tombstones in Cassandra using LCS are cretaed in the same level data TTLed data?

s good if you can rotate the partitions over time, > not to reuse old partitions for example. > > C*heers, > --- > Alain Rodriguez - @arodream - al...@thelastpickle.com > France / Spain > > The Last Pickle - Apache Cassandra Consulting > http://ww

Cassandra crashed during major compaction

After a bulk load of writes to existing partition keys (with a higher timestamp), I wanted to free disk space, suspecting that rows will be in the highest levels and it would take a time until they were compacted. I've started a major compaction, and the disk usage went from ~30% to ~40% (as expect

How to monitor datastax driver compression performance?

Hi, I'm trying to test if adding driver compression will bring me any benefit. I understand that the trade-off is less bandwidth but increased CPU usage in both cassandra nodes (compression) and client nodes (decompression) but I want to know what are the key metrics and how to monitor them to prob

Re: How to monitor datastax driver compression performance?

rs). > > Jon > > > > > On Mon, Apr 8, 2019 at 7:26 AM Gabriel Giussi > wrote: > > > > Hi, I'm trying to test if adding driver compression will bring me any > benefit. > > I understand that the trade-off is less bandwidth but increased CPU > usage i

How to delete huge partition in cassandra 3.0.13

I've found a huge partion (~9GB) in my cassandra cluster because I'm loosing 3 nodes recurrently due to OutOfMemoryError > ERROR [SharedPool-Worker-12] 2019-08-12 11:07:45,735 > JVMStabilityInspector.java:140 - JVM state determined to be unstable. > Exiting forcefully due to: > java.lang.OutOfMemo

How the write path finds the N nodes to write to?

I know cassandra uses consistent hashing for choosing the node where a key should go to, and if I understand correctly from this image https://cassandra.apache.org/doc/latest/cassandra/_images/ring.svg if the replication factor is 3 it just picks the other two nodes following the ring clockwise. I