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Multi dc reaper - Cassandra - [mail # user]
...Hi Abdul,the thing with multi DC Cassandra clusters is usually that JMX is notaccessible on the cross DC link, which means that one Reaper in a DC cannotreach the nodes in remote DCs directl...
   Author: Alexander Dejanovski , 2018-10-01, 06:35
[CASSANDRA-14685] Incremental repair 4.0 : SSTables remain locked forever if the coordinator dies during streaming - Cassandra - [issue]
...The changes in CASSANDRA-9143 modified the way incremental repair performs by applying the following sequence of events :  Anticompaction is executed on all replicas for all SSTables overlap...
http://issues.apache.org/jira/browse/CASSANDRA-14685    Author: Alexander Dejanovski , 2018-09-20, 06:25
Large partitions - Cassandra - [mail # user]
...Hi Gedeon,you should check Robert Stupp's 2016 talk about large partitions :https://www.youtube.com/watch?v=N3mGxgnUiRYCheers,On Thu, Sep 13, 2018 at 6:42 PM Gedeon Kamga  wrote:> Fo...
   Author: Alexander Dejanovski , 2018-09-13, 16:47
High IO and poor read performance on 3.11.2 cassandra cluster - Cassandra - [mail # user]
...Don't forget to run "nodetool upgradesstables -a" after you ran the ALTERstatement so that all SSTables get re-written with the new compressionsettings.Since you have a lot of tables in your...
   Author: Alexander Dejanovski , 2018-09-05, 06:01
[expand - 1 more] - URGENT: disable reads from node - Cassandra - [mail # user]
...Kurt is right.So here are the options I can think of :- use the join_ring false technique and rely on hints. You'll need todisable the native transport on the node as well to prevent directc...
   Author: Alexander Dejanovski , 2018-08-29, 13:13
Incremental repair - Cassandra - [mail # user]
...Hi Pratchi,Incremental has been the default since C* 2.2.You can run a full repair by adding the "--full" flag to your nodetoolcommand.Cheers,Le lun. 20 août 2018 à 19:50, Prachi Rath  ...
   Author: Alexander Dejanovski , 2018-08-20, 18:16
Compaction throughput vs. number of compaction threads? - Cassandra - [mail # user]
...Hi,The compaction throughput is indeed shared by all compactors.I would not advise to go below 8MB/s per compactor as slowing downcompactions put more pressure on the heap.When tuning compac...
   Author: Alexander Dejanovski , 2018-06-05, 09:20
[expand - 1 more] - Question About Reaper - Cassandra - [mail # user]
...You won't be able to have less segments than vnodes, so just use 256segments per node, use parallel as repair parallelism, and set intensity to1.You apparently have more than 3TB per node, a...
   Author: Alexander Dejanovski , 2018-05-22, 05:55
[CASSANDRA-14326] Handle verbose logging at a different level than DEBUG - Cassandra - [issue]
...CASSANDRA-10241 introduced debug logging turned on by default to act as a verbose system.log and help troubleshoot production issues. One of the consequence was to severely affect read perfo...
http://issues.apache.org/jira/browse/CASSANDRA-14326    Author: Alexander Dejanovski , 2018-04-16, 06:29
Nodetool repair multiple dc - Cassandra - [mail # user]
...Hi Abdul,Reaper has been used in production for several years now, by many companies.I've seen it handling 100s of clusters and 1000s of nodes with a singleReaper process.Check the docs on c...
   Author: Alexander Dejanovski , 2018-04-13, 14:42