Problems with cassandra on AWS

Hi Guys, I installed a 3 node Cassandra cluster on AWS and my replication factor is 3. I am trying to insert some data into a table. I set the consistency level of QUORUM at a Cassandra Session level. It only inserts into one node and unable to talk to other nodes because it is trying to contact

Re: Why does CockroachDB github website say Cassandra has no Availability on datacenter failure?

x.com > > Sent: February 7, 2017 7:43 AM > > To: dev@cassandra.apache.org > > Reply-to: dev@cassandra.apache.org > > Subject: Re: Why does CockroachDB github website say Cassandra has no > > Availability on datacenter failure? > > > > > > Do not

Why does CockroachDB github website say Cassandra has no Availability on datacenter failure?

Why does CockroachDB github website say Cassandra has no Availability on datacenter failure? https://github.com/cockroachdb/cockroach

Re: Why does CockroachDB github website say Cassandra has no Availability on datacenter failure?

On Tue, Feb 7, 2017 at 3:52 AM, Kant Kodali <k...@peernova.com> wrote: > > > This is the picture taken from https://github.com/cockroachdb/cockroach > > On Tue, Feb 7, 2017 at 3:01 AM, Benjamin Lerer < > benjamin.le...@datastax.com> wrote: > >> ... and by

Re: Why does CockroachDB github website say Cassandra has no Availability on datacenter failure?

lol. But seriously are they even allowed to say something that is not true about another product ? On Tue, Feb 7, 2017 at 4:05 AM, kurt greaves wrote: > Marketing never lies. Ever >

Re: Why does CockroachDB github website say Cassandra has no Availability on datacenter failure?

d write a blog post showing Cassandra survive a failure and we can > link to it from the Cassandra site. > > Now, this doesn't apply to trademarks, as the PMC is responsible for > "defending" its marks. > > > > On Tue, Feb 7, 2017 at 7:59 AM Kant Kodali <k...@pe

Re: AW: Why does CockroachDB github website say Cassandra has noAvailability on datacenter failure?

; *Cc:* u...@cassandra.apache.org > *Betreff:* Re: Why does CockroachDB github website say Cassandra has > noAvailability on datacenter failure? > > > > The link you posted doesn't say anything about Cassandra > > Le 7 févr. 2017 11:41, "Kant Kodali" <k...@peernova.com> a écrit : > > Why does CockroachDB github website say Cassandra has no Availability on > datacenter failure? > > https://github.com/cockroachdb/cockroach > > > >

Re: AW: Why does CockroachDB github website say Cassandra has noAvailability on datacenter failure?

https://github.com/cockroachdb/cockroach/commit/f46a547827d3439b57baa5c3a11f8f9ad2d8b153 On Tue, Feb 7, 2017 at 3:20 PM, Kant Kodali <k...@peernova.com> wrote: > LOL They took down that image finally!! But I would still keep an eye on > what kind of fake benchmarks they m

Re: quick question

Adding dev only for this thread. On Wed, Feb 1, 2017 at 4:39 AM, Kant Kodali <k...@peernova.com> wrote: > What is the difference between accepting a value and committing a value? > > > > On Wed, Feb 1, 2017 at 4:25 AM, Kant Kodali <k...@peernova.com> wrote: > >&g

Re: Does C* coordinator writes to replicas in same order or different order?

synchronous, you'll have a large penalty for latency. > > On Mon, Feb 20, 2017 at 10:11 PM, Kant Kodali <k...@peernova.com> wrote: > >> Thanks again for the response! if they mean it between client and server >> I am not sure why they would use the word "replication

Are Cassandra Triggers Thread Safe? ("Tough questions perhaps!")

Hi, 1. Are Cassandra Triggers Thread Safe? what happens if two writes invoke the trigger where the trigger is trying to modify same row in a partition? 2. Had anyone used it successfully on production? If so, any issues? (I am using the latest version of C* 3.10) 3. I have partitions that are

Does C* coordinator writes to replicas in same order or different order?

Hi, when C* coordinator writes to replicas does it write it in same order or different order? other words, Does the replication happen synchronously or asynchrnoulsy ? Also does this depend sync or async client? What happens in the case of concurrent writes to a coordinator ? Thanks, kant

If reading from materialized view with a consistency level of quorum am I guaranteed to have the most recent view?

If reading from materialized view with a consistency level of quorum am I guaranteed to have the most recent view? other words is w + r > n contract maintained for MV's as well for both reads and writes? Thanks!

Re: If reading from materialized view with a consistency level of quorum am I guaranteed to have the most recent view?

PRIMARY KEY ((b), a) > > > 2017-02-10 19:46 GMT+01:00 Kant Kodali <k...@peernova.com>: > > > Okies now I understand what you mean by "same" partition key. I think > you > > are saying > > > > PRIMARY KEY(col1, col2, col3) == PRIMARY KEY(col2, c

Re: If reading from materialized view with a consistency level of quorum am I guaranteed to have the most recent view?

e append only cases (or more > general cases that don't require a read before write on update) you are > maybe better off with batched denormalized atomics writes. > > The main benefit of MVs is if you need denormalization to sort or filter by > a non-primary key field. > > 2017

Re: If reading from materialized view with a consistency level of quorum am I guaranteed to have the most recent view?

PRIMARY KEY ((a), b, c) and > > > PRIMARY KEY ((a), c, b) > > > > > > Different partition key: > > > > > > PRIMARY KEY ((a, b), c, d) and > > > PRIMARY KEY ((a), b, d, c) > > > > > > PRIMARY KEY ((a), b) and > > > P

Re: If reading from materialized view with a consistency level of quorum am I guaranteed to have the most recent view?

update may always "arrive > late". I guess it has been implemented like this to not block in case of > remote request to prefer the cluster sanity over consistency. > > Is it now 100% clear? > > 2017-02-10 19:17 GMT+01:00 Kant Kodali <k...@peernova.com>: > > > So R+

Re: If reading from materialized view with a consistency level of quorum am I guaranteed to have the most recent view?

Am 10.02.2017 09:17 schrieb "Kant Kodali" <k...@peernova.com>: > > thanks! > > On Thu, Feb 9, 2017 at 8:51 PM, Benjamin Roth <benjamin.r...@jaumo.com> > wrote: > > > Yes it is > > > > Am 10.02.2017 00:46 schrieb "Kant Kodali" <k

Re: If reading from materialized view with a consistency level of quorum am I guaranteed to have the most recent view?

thanks! On Thu, Feb 9, 2017 at 8:51 PM, Benjamin Roth <benjamin.r...@jaumo.com> wrote: > Yes it is > > Am 10.02.2017 00:46 schrieb "Kant Kodali" <k...@peernova.com>: > > > If reading from materialized view with a consistency level of quorum am I > >

How to write a trigger in Cassandra to only detect updates of an existing row ?

Hi all, How to write a trigger in Cassandra to detect updates? My requirement is that I want a trigger to alert me only when there is an update to an existing row and looks like given the way INSERT and Update works this might be hard to do because INSERT will just overwrite if there is an

Is there a way to do Read and Set at Cassandra level?

I have a requirement where I need to know last value that is written successfully so I could read that value and do some computation and include it in the subsequent write. For now we are doing read before write which significantly degrades the performance. Light weight transactions are more of a

Re: Is there a way to do Read and Set at Cassandra level?

e that is written > successfully so I could read that value and do some computation and include > it in the subsequent write" > > Maybe keeping the last written value in a distributed cache is cheaper > than doing a read before write in Cassandra ? > > On Sat, Nov 5, 2016 at 11:2

Is SASI index in Cassandra efficient for high cardinality columns?

I understand Secondary Indexes in general are inefficient on high cardinality columns but since SASI is built from scratch I wonder if the same argument applies there? If not, Why? Because I believe primary keys in Cassandra are indeed indexed and since Primary key is supposed to be the column

Re: Is SASI index in Cassandra efficient for high cardinality columns?

Do you mean: > > 1) a single indexed value is present in a lot of rows > 2) a single indexed value has only a few (if not just one) matching row > > > On Sat, Oct 15, 2016 at 8:37 AM, Kant Kodali <k...@peernova.com> wrote: > >> I understand Secondary Indexes in ge

Re: Is SASI index in Cassandra efficient for high cardinality columns?

ialized views guarantee that for each search indexed value, you only > hit a single node (or N replicas depending on the used consistency level) > > However, materialized views have their own drawbacks (weeker consistency > guarantee) and you can't use range queries (<, >, ≤,

Why does Cassandra need to have 2B column limit? why can't we have unlimited ?

Hi All, I understand Cassandra can have a maximum of 2B rows per partition but in practice some people seem to suggest the magic number is 100K. why not create another partition/rowkey automatically (whenever we reach a safe limit that we consider would be efficient) with auto increment bigint

Re: Why does Cassandra need to have 2B column limit? why can't we have unlimited ?

to be careful though (just like with random > partition) > > Can you tell what rowkey1, page1, col(x) actually are ? Maybe there is a > way. > The most "recent", means there's a timestamp in there ? > > On Wed, Oct 12, 2016 at 9:58 AM, Kant Kodali <k...@peernov

Re: State of triggers

+1 On Thu, Mar 2, 2017 at 11:04 AM, S G wrote: > Hi, > > I am not able to find any documentation on the current state of triggers > being production ready. > > The post at > http://www.datastax.com/dev/blog/whats-new-in-cassandra-2- > 0-prototype-triggers-support >

Re: Does partition size limitation still exists in Cassandra 3.10 given there is a B-tree implementation?

Doan <doanduy...@gmail.com> wrote: > Yes the recommendation still applies > > Wide partitions have huge impact on repair (over streaming), compaction > and bootstrap > > Le 10 mai 2017 23:54, "Kant Kodali" <k...@peernova.com> a écrit : > > H

Re: Does partition size limitation still exists in Cassandra 3.10 given there is a B-tree implementation?

oh this looks like one I am looking for https://issues.apache.org/jira/browse/CASSANDRA-9754. Is this in Cassandra 3.10 or merged somewhere? On Thu, May 11, 2017 at 1:13 AM, Kant Kodali <k...@peernova.com> wrote: > Hi DuyHai, > > I am trying to see what are the possible things w

Does partition size limitation still exists in Cassandra 3.10 given there is a B-tree implementation?

Hi All, Cassandra community had always been recommending 100MB per partition as a sweet spot however does this limitation still exist given there is a B-tree implementation to identify rows inside a partition?

Re: Weird error (unable to start cassandra)

I had to do brew upgrade jemalloc to fix this issue. On Mon, Sep 11, 2017 at 4:25 AM, Kant Kodali <k...@peernova.com> wrote: > Hi All, > > I am trying to start cassandra 3.11 on Mac OS Sierra 10.12.6. when invoke > cassandra binary I get the following error > > java(298

Weird error (unable to start cassandra)

Hi All, I am trying to start cassandra 3.11 on Mac OS Sierra 10.12.6. when invoke cassandra binary I get the following error java(2981,0x7fffedb763c0) malloc: *** malloc_zone_unregister() failed for 0x7fffedb6c000 I have xcode version 8.3.3 installed (latest). Any clue ? Thanks!

Re: [DISCUSS] java 9 and the future of cassandra on the jdk

Java 10 is releasing today! On Tue, Mar 20, 2018 at 9:07 AM, Ariel Weisberg wrote: > Hi, > > +1 to what Jordan is saying. > > It seems like if we are cutting a release off of trunk we want to make > sure we get N years of supported JDK out of it. For a single LTS release N >