Cassandra Summit 2015 Roll Call!

Cassandra Summit 2015 is upon us! Every year, the conference gets bigger and bigger, and the chance of IRL meeting people you've "met" online gets smaller and smaller. To improve everyone's chances, if you are attending the summit : 1) respond on-thread with a brief introduction (and physical

Re: Cassandra Summit 2015 Roll Call!

I'am here! Beaded guy, in a blue gingham shirt. I'll be at the reception. On Tue, Sep 22, 2015 at 2:59 PM, Jonathan Haddad wrote: > Yo. It's me. Haddad, aka rustyrazorblade. 6'1", hair probably in a bun > and a beard. Helping with training today, giving a talk on

Re: Cassandra Summit 2015 Roll Call!

I will be wearing a red t-shirt that says SimpleReach and I will be at the reception tonight, the MVP dinner and the summit both days. I'm about 5'11" and probably going to be the best looking person there. ;) See you all at the summit. On Tue, Sep 22, 2015 at 11:27 AM, Robert Coli

Re: Cassandra Summit 2015 Roll Call!

Yo. It's me. Haddad, aka rustyrazorblade. 6'1", hair probably in a bun and a beard. Helping with training today, giving a talk on pyspark & on the python driver tomorrow. I'll be at the MVP dinner. Wearing a DataStax training t shirt today, not sure about the rest of the time though. Here I

Re: High read latency

select * from test where a = ? and b = ? On Tue, Sep 22, 2015 at 10:27 AM, sai krishnam raju potturi < pskraj...@gmail.com> wrote: > thanks for the information. Posting the query too would be of help. > > On Tue, Sep 22, 2015 at 11:56 AM, Jaydeep Chovatia < > chovatia.jayd...@gmail.com> wrote: >

Re: High read latency

thanks for the information. Posting the query too would be of help. On Tue, Sep 22, 2015 at 11:56 AM, Jaydeep Chovatia < chovatia.jayd...@gmail.com> wrote: > Please find required details here: > > - Number of req/s > > 2k reads/s > > - Schema details > > create table test { > >

Re: ScyllaDB, a new open source, Cassandra-compatible NoSQL

Tzach, Can you point to any documentation on scylladb site which talks about how/why scylla db performs better than Cassandra while using the same architecture? Regards Sachin On Tue, Sep 22, 2015 at 9:18 AM, Tzach Livyatan wrote: > Hello Cassandra users, > > We are

Throttling Cassandra Load

Hi, We are using Cassandra 2.0.14 with Hector 1.1.4. Each node in cluster has an application using Hector and a Cassandra instance. I want suggestions on the approach we are taking for throttling Cassandra load. Problem Statement: Misbehaved clients can bring down Cassandra clusters by

Re: Help with tombstones and compaction

Thank you so much Jeff! I will bump to Cassandra 2.1.9 and update this thread with the results! Thanks, Venkatesh On Mon, Sep 21, 2015 at 2:19 PM, Jeff Jirsa wrote: > The timestamp involed here isn’t the one defined in the schema, it’s the > timestamp written on

Re: ScyllaDB, a new open source, Cassandra-compatible NoSQL

First glance at their github, it looks like they re-implemented Cassandra in C++. 90% components in Cassandra are in scylladb, i.e. compaction, repair, CQL, gossip, SStable. With C++, I believe this helps performance to some extent up to a point when compaction has not run yet. Then, it will be

Re: ScyllaDB, a new open source, Cassandra-compatible NoSQL

I came across this article: zdnet.com/article/kvm-creators-open-source-fast-cassandra-drop-in-replacement-scylla/ Tzach, I would love to know/understand moree about ScyllaDB too. Also the benchmark seems to have only 1 DB Server. Do you have benchmark numbers where more than 1 DB servers were

Re: Throttling Cassandra Load

On Tue, Sep 22, 2015 at 1:06 PM, Anuj Wadehra wrote: > We are using Cassandra 2.0.14 with Hector 1.1.4. Each node in cluster has > an application using Hector and a Cassandra instance. > Why are you using Hector? =Rob

Re: ScyllaDB, a new open source, Cassandra-compatible NoSQL

On Wed, Sep 23, 2015 at 12:20 AM, Minh Do wrote: > First glance at their github, it looks like they re-implemented Cassandra > in C++. 90% components in Cassandra are > in scylladb, i.e. compaction, repair, CQL, gossip, SStable. > True > > > With C++, I believe this helps

Re: ScyllaDB, a new open source, Cassandra-compatible NoSQL

On Wed, Sep 23, 2015 at 12:13 AM, Venkatesh Arivazhagan < venkey.a...@gmail.com> wrote: > I came across this article: > zdnet.com/article/kvm-creators-open-source-fast-cassandra-drop-in-replacement-scylla/ > > Tzach, I would love to know/understand moree about ScyllaDB too. Also the > benchmark

Re: ScyllaDB, a new open source, Cassandra-compatible NoSQL

very interesting. I'm glad to see someone building a drop in replacement for Cassandra. On Tue, Sep 22, 2015 at 5:40 PM, Tzach Livyatan wrote: > Hi Sachin > > On Tue, Sep 22, 2015 at 11:40 PM, Sachin Nikam wrote: > >> Tzach, >> Can you point to

Re: ScyllaDB, a new open source, Cassandra-compatible NoSQL

Hi Sachin On Tue, Sep 22, 2015 at 11:40 PM, Sachin Nikam wrote: > Tzach, > Can you point to any documentation on scylladb site which talks about > how/why scylla db performs better than Cassandra while using the same > architecture? > see here

RE: Cassandra Summit 2015 Roll Call!

Hey everyone, I will be at the summit too on Wed and Thu. I am giving a talk on Thursday at 2.40pm. Would love to meet everyone on this list in person. Here is an old picture of mine: https://events.mfactormeetings.com/accounts/register123/mfactor/datastax/events/dstaxsummit2015/guller.jpg

Re: Cassandra Summit 2015 Roll Call!

I am here. Wearing my assorted Cassandra shirts from meetups and conferences. Would be happy to meet anyone from this mailing list because the conversations here have been very valuable as I have ramped up with Cassandra. And I passed my developer certification today. :-) I am identifiable from

Re: Throttling Cassandra Load

Hi Robert, We will be moving to CQL incrementally. But that would take some time (at least 6 mths). Till then we need a solution for throttling load. Can you comment on the approach mentioned and any better ideas for achieving that? Thanks Anuj Sent from Yahoo Mail on Android

Re: Unable to remove dead node from cluster.

ping. On Mon, Sep 21, 2015 at 11:51 AM, Dikang Gu wrote: > I have tried all of them, neither of them worked. > 1. decommission: the host had hardware issue, and I can not connect to it. > 2. remove, there is not HostID, so the removenode did not work. > 3.

Re: Cassandra Summit 2015 Roll Call!

I’m here. Will be speaking Wednesday on DTCS for time series workloads: http://cassandrasummit-datastax.com/agenda/real-world-dtcs-for-operators/ Picture if you recognize me, say hi: https://events.mfactormeetings.com/accounts/register123/mfactor/datastax/events/dstaxsummit2015/jirsa.jpg

Re: Cassandra Summit 2015 Roll Call!

Hi guys. I'm already here and I'll be the whole Summit. I'll be doing a live demo on Thursday on troubleshooting Cassandra production issues as a developer. This is me!! https://twitter.com/calonso/status/646352711454097408 Carlos Alonso | Software Engineer | @calonso

Re: High read latency

Please find required details here: - Number of req/s 2k reads/s - Schema details create table test { a timeuuid, b bigint, c int, d int static, e int static, f int static, g int static, h int, i text, j text, k text, l text, m set n bigint o bigint p bigint q

ScyllaDB, a new open source, Cassandra-compatible NoSQL

Hello Cassandra users, We are pleased to announce a new member of the Cassandra Ecosystem - ScyllaDB ScyllaDB is a new, open source, Cassandra-compatible NoSQL data store, written with the goal of delivering superior performance and consistent low latency. Today, ScyllaDB runs 1M tps per server

Re: memory usage problem of Metadata.tokenMap.tokenToHost

Hi Joseph, I think 2000 keyspaces might be just too much. Fewer keyspaces (and CFs) will probably work much better. kind regards, Christian On Tue, Sep 22, 2015 at 9:29 AM, joseph gao wrote: > Hi, anybody could help me? > > 2015-09-21 0:47 GMT+08:00 joseph gao

Re: memory usage problem of Metadata.tokenMap.tokenToHost

Hi, anybody could help me? 2015-09-21 0:47 GMT+08:00 joseph gao : > ps : that's the code in java drive , in MetaData.TokenMap.build: > > for (KeyspaceMetadata keyspace : keyspaces) > { > ReplicationStrategy strategy = keyspace.replicationStrategy(); > Map

RE: High read latency

Hi, Before speaking about tuning, can you provide some additional information ? - Number of req/s - Schema details - JVM settings about the heap - Execution time of the GC 43ms for a read latency may be acceptable according to the number of request per

To batch or not to batch: A question for fast inserts

General advice advocates for individual async inserts as the fastest way to insert data into Cassandra. Our insertion mechanism is based on that model and recently we have been evaluating performance, looking to measure and optimize our ingestion rate. I side-tracked some punctual benchmarks and