Re: Garbage collector launched on all nodes at once

How much memory do you have? Recently people have been seeing really great performance using G1GC with heaps > 8GB and offheap memtable objects. On Thu, Jun 18, 2015 at 1:31 AM Jason Wee wrote: > okay, iirc memtable has been removed off heap, google and got this > http://www.datastax.com/dev/bl

Re: Garbage collector launched on all nodes at once

okay, iirc memtable has been removed off heap, google and got this http://www.datastax.com/dev/blog/off-heap-memtables-in-Cassandra-2-1 apparently, there are still some reference on heap. On Thu, Jun 18, 2015 at 1:11 PM, Marcus Eriksson wrote: > It is probably this: https://issues.apache.org/ji

Re: Garbage collector launched on all nodes at once

It is probably this: https://issues.apache.org/jira/browse/CASSANDRA-9549 On Wed, Jun 17, 2015 at 7:37 PM, Michał Łowicki wrote: > Looks that memtable heap size is growing on some nodes rapidly ( > https://www.dropbox.com/s/3brloiy3fqang1r/Screenshot%202015-06-17%2019.21.49.png?dl=0). > Drops ar

Re: Garbage collector launched on all nodes at once

Looks that memtable heap size is growing on some nodes rapidly ( https://www.dropbox.com/s/3brloiy3fqang1r/Screenshot%202015-06-17%2019.21.49.png?dl=0). Drops are the places when nodes have been restarted. On Wed, Jun 17, 2015 at 6:53 PM, Michał Łowicki wrote: > Hi, > > Two datacenters with 6 no

Garbage collector launched on all nodes at once

Hi, Two datacenters with 6 nodes (2.1.6) each. In each DC garbage collection is launched at the same time on each node (See [1] for total GC duration per 5 seconds). RF is set to 3. Any ideas? [1] https://www.dropbox.com/s/bsbyew1jxbe3dgo/Screenshot%202015-06-17%2018.49.48.png?dl=0 -- BR, Micha

Re: Connection reset during repair service

Regarding the Datastax repair service I saw the same error over here. Here is the datastax answer fwiw: "The repair service timeout message is telling you that the service has not received a response from the nodetool repair process running on Cassandra within the configured (default) 3600 second

Re: Connection reset during repair service

Do you do a ton of random updates amd deletes? That would not be a good workload for DTCS. Where are all your tombstones coming from? On Jun 17, 2015 3:43 AM, "Alain RODRIGUEZ" wrote: > Hi David, Edouard, > > Depending on your data model on event_data, you might want to consider > upgrading to

Minor compaction not triggered

Hi I have a cassandra cluster of 6 nodes, with DateTiered compaction for the tables/CFs For some reason the minor compaction never happens. I have enabled debug logging and I don't see any debug logs related to compaction like the following https://github.com/apache/cassandra/blob/cassandra-2.0/s

spark-sql estimates Cassandra table with 3 rows as 8 TB of data, Cassandra 2.1, DSE 4.7

Hi, spark-sql estimated input for Cassandra table with 3 rows as 8 TB. sometimes it's estimated as -167B. I run it on laptop, I don't have 8 TB space for the data. We use DSE 4.7 with bundled spark and spark-sql-thriftserver Here is the stat for a dummy select foo from bar where bar three rows an

Re: Using Cassandra and Twisted (Python)

Hello Alex, thanks for your answer! I'll try posting there as well then! Best, Jonathan On 06/16/2015 07:05 PM, Alex Popescu wrote: Jonathan, I'm pretty sure you'll have better chances to get this answered on the Python driver mailing list https://groups.google.com/a/lists.datastax.com/for

Re: Connection reset during repair service

Hi David, Edouard, Depending on your data model on event_data, you might want to consider upgrading to use DTCS (C* 2.0.11+). Basically if those tombstones are due to a a Constant TTL and this is a time series, it could be a real improvement. See: https://labs.spotify.com/2014/12/18/date-tiered-