Re: Cassandra mad GC

Have you followed the recommended prod settings and installed JNA, Oracle JDK etc..? http://www.datastax.com/documentation/cassandra/2.0/webhelp/index.html#cassandra/install/installRecommendSettings.html On 14 Jan 2014, at 13:16, Dimetrio dimet...@flysoft.ru wrote: Hi all. I have many GC

Re: Gossip intermittently marks node as DOWN

What is nodetool tpstats telling you? On 4 Mar 2014, at 15:10, Phil Luckhurst phil.luckhu...@powerassure.com wrote: It was created with the default settings so we have 256 per node. Fabrice Facorat wrote From what I understand, this can happen when having many nodes and vnodes by node.

Re: Gossip intermittently marks node as DOWN

That looks healthy - nothing blocked or dropped. On 4 Mar 2014, at 16:12, Phil Luckhurst phil.luckhu...@powerassure.com wrote: Here's the tpstats output from both nodes. Johnny Miller wrote What is nodetool tpstats telling you? -- View this message in context: http

Re: EC2 - Performace Question

Try turning on query tracing to see what's taking lots of time. On 1 Sep 2014, at 23:54, Laing, Michael michael.la...@nytimes.com wrote: Is there a reason why updating a counter for this information will not work for you? On Monday, September 1, 2014, eduardo.cusa

Re: OpsCenter_rollups*

@Rob - You can have OpsCenter not write to the cluster it's monitoring: http://www.datastax.com/dev/blog/storing-opscenter-data-in-a-separate-cluster. OpsCenter has supported this for sometime. On 26 Aug 2014, at 12:07, Mark Reddy mark.l.re...@gmail.com wrote: Why is there so much OpsCenter

Re: query tracing

Be cautious enabling query tracing. Great tool for dev/testing/diagnosing etc.. - but it does persist data to the system_traces keyspace with a TTL of 24 hours and will, as a consequence, consume resources. http://www.datastax.com/dev/blog/advanced-request-tracing-in-cassandra-1-2

Re: Best way to recreate a cassandra node with data

John - Why not just just follow the process for replacing a dead node? Why do you need to use the same IP? e.g. JVM_OPTS="$JVM_OPTS -Dcassandra.replace_address=address_of_dead_node http://docs.datastax.com/en/cassandra/1.2/cassandra/operations/ops_replace_node_t.html

Re: Does nodetool cleanup clears tombstones in the CF?

You could also have a look at the JMX forceUserDefinedCompaction call on a specific SSTable > On 5 Nov 2015, at 21:56, K F wrote: > > Thanks Rob, I will look into checksstablegarbage utility. However, I don't > want to run major compaction as that would result in too big

Re: How is the coordinator node in LOCAL_QUORUM chosen?

I always explicitly specify the local DC in my apps for the DC aware round robin policy in a multi DC deployment (localDC arg on the constructor) http://docs.datastax.com/en/drivers/nodejs/3.0/module-policies_loadBalancing-DCAwareRoundRobinPolicy.html Maybe just do that if you want to specify

Re: Questions on LCS behaviour after big BulkLoad cluster bootstrap

Garo, When your loading data in using LCS in a bulk fashion like this, there are a few things you should do. You can disable STCS in L0 (https://issues.apache.org/jira/browse/CASSANDRA-6621 ) with the JVM flag

Re: NoHostAvailableException coming up on our server

Abhinav - your getting that as the driver isn’t finding any hosts up for your query. You probably need to check if all the nodes in your cluster are running. See: http://docs.datastax.com/en/drivers/java/3.0/com/datastax/driver/core/exceptions/NoHostAvailableException.html Johnny > On 12 Jul

Re: (C)* stable version after 3.5

Hey Varun - yeah, I would stick to 3.0.x for stability reasons unless there is a feature in the later releases you want. You should be able to upgrade directly to 3.0 from 2.1 without going via 2.2 > On 12 Jul 2016, at 15:01, Alain RODRIGUEZ wrote: > > Hi, > > The only

Re: Trying to find cause of exception

ference.conf <https://github.com/akka/akka-persistence-cassandra/blob/master/src/main/resources/reference.conf>) - things like local-datacenter, replication-strategy, write-consistency, read-consistency (is there a reason its ONE and not LOCAL_ONE) etc. Regards, Johnny -- Johnny Miller Co-F

New Cassandra Luxembourg Meetup

Moein all! I have just started a new Cassandra Luxembourg meetup if people are interested (and why woul you not)! https://www.meetup.com/Cassandra-Luxembourg/ My company will sponsor and schedule some talks etc.. if there is enough demand. So sign up - could be interesting!! Johnny -- --

New Cassandra Luxembourg Meetup

Moein all! I have just started a new Cassandra Luxembourg meetup if people are interested (and why would you not)! https://www.meetup.com/Cassandra-Luxembourg/ My company will sponsor and schedule some talks etc.. if there is enough demand. So

Re: Running Cassandra on FreeBSD

gt; # > # A fatal error has been detected by the Java Runtime Environment: > # > # SIGSEGV (0xb) at pc=0x0008020cf55d, pid=60352, > tid=0x00018ecf > # > # JRE version: OpenJDK Runtime Environment (8.0_144-b01) (build > 1.8.0_144-b01) > # Java VM: OpenJDK 64-Bit Server V

Re: Should we use Materialised Views or ditch them ?

I have had some serious issues with MVs in production - I would recommend not using them. On Fri, 28 Feb 2020 at 22:34, Erick Ramirez wrote: > Personally, I think MVs are still experimental and not ready for > primetime. It works for some but if you run into issues, fixing them have a > huge

Re: Encrypting JMX password for cassandra

Jai, I haven't tried it myself, but you might be able to implement something like this as I believe this is generic to Java. https://stackoverflow.com/questions/1676513/how-to-encrypt-passwords-for-jconsoles-password-file This may allow you to encrypt the JMX password in the file. Would be

Re: CDC Tools

Dor - that looks very useful. Looking forward to trying the CDC Kafka connector! On Thu, 28 May 2020 at 02:53, Dor Laor wrote: > If it's helpful, IMO, the approach Cassandra needs to take isn't > by tracking the individual node commit log and putting the burden > on the client. At Scylla, we

Re: migrating driver from 3.4 to 4.9

Manu - one thing to make sure your aware of is with the latest driver version (4.9) it’s not just about binary compatibility. There has been a removal of certain core features from the driver which if you are using you may find you’ve more work todo then you expected. The ability to route

Re: What does the community think of the DataStax 4.x Java driver changes?

;> >>> Generally, we work with alot of application teams, and most of them are >>> putting off the inevitable of the changes required to implement 4.x. In a >>> reasonably well written moderately complex app, it took one of our best >>> developers 2 weeks ma

Re: What does the community think of the DataStax 4.x Java driver changes?

gt; which should give a clear path to fixing some of these API issues as well > as the loss of functionality on a major. > > > On Thu, Oct 29, 2020 at 8:37 AM, Johnny Miller > wrote: > >> Hi Everybody, >> >> >> We wanted to reach out to the community around t

What does the community think of the DataStax 4.x Java driver changes?

icy We look after many DataStax / Cassandra clusters and these changes in the latest driver changes have left us scratching our heads. We would be interested in hearing your thoughts on these observations. Thanks, Johnny -- Johnny Miller Co-Founder & CTO https://digitalis.io <

Re: What does the community think of the DataStax 4.x Java driver changes?

of driver 4.) >> >> 2) Downgrading retries: >> >> https://github.com/datastax/java-driver/blob/4.x/examples/src/main/java/com/datastax/oss/driver/examples/retry/DowngradingRetry.java >> >> Still on the cross-DC failover topic, we also published a white paper >> a

Re: Setting DC in different geographical location

Ashish, *> So, with this speed, is it possible in cassandra to perform asynchronous write in new DC(India)? * Nope, however your consistency level choice on writes is the main control for this. You write to the local DC with LOCAL_* consistency would make the acks on write to the remote DC not

Re: Cassandra on ZFS: disable compression?

I have done this several times i.e disabling compression at the table level. Never had any issues. On Wed, 27 Jan 2021 at 01:37, Elliott Sims wrote: > The main downside I see is that you're hitting a less-tested codepath. I > think very few installations have compression disabled today. > > On

Re: Use NetworkTopologyStrategy for single data center and add data centers later

Never, ever use SimpleStrategy in production - that's my golden rule. It's extremely limiting if you do and a pain to change your mind later. On Thu, 28 Jan 2021 at 02:00, Carl Mueller wrote: > Yes, perform that as soon as possible. > > When you add a new datacenter, keyspaces that are