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 o
when are we moving from SEDA to TPC? any timeline or something that I can
look out for?
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 existin
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
st 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 wrote:
>
>> Hi All,
>>
>
>
>> 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 wrote:
>>
>>> Hi All,
>>>
>>
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 with
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 wrote:
>
>> I understand Secondary Indexes in general are inefficient on high
>> cardinality
ee 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 (<, >, ≤, ≥) or full text
> se
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 c
lly 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 11:24 AM, Kant Kodali wrote:
Adding dev only for this thread.
On Wed, Feb 1, 2017 at 4:39 AM, Kant Kodali wrote:
> What is the difference between accepting a value and committing a value?
>
>
>
> On Wed, Feb 1, 2017 at 4:25 AM, Kant Kodali wrote:
>
>> Hi,
>>
>> Thanks for the response.
Why does CockroachDB github website say Cassandra has no Availability on
datacenter failure?
https://github.com/cockroachdb/cockroach
le...@datastax.com
> > wrote:
>
> > May be you should ask them? We are not involved in the CockroachDB github
> > website.
> >
> > On Tue, Feb 7, 2017 at 11:41 AM, Kant Kodali wrote:
> >
> >> Why does CockroachDB github website say Cassandra has no Ava
On Tue, Feb 7, 2017 at 3:52 AM, Kant Kodali 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 the way, it is far from be
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
>
njamin.le...@datastax.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?
> >
> >
> &
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 wrote:
>
>
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" a écrit :
>
> Why does CockroachDB github website say Cassandra has no Availability on
> datacenter failure?
>
> https://github.com/cockroachdb/cockroach
>
>
>
>
https://github.com/cockroachdb/cockroach/commit/f46a547827d3439b57baa5c3a11f8f9ad2d8b153
On Tue, Feb 7, 2017 at 3:20 PM, Kant Kodali wrote:
> LOL They took down that image finally!! But I would still keep an eye on
> what kind of fake benchmarks they might come up with.
>
> On Tue,
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!
thanks!
On Thu, Feb 9, 2017 at 8:51 PM, Benjamin Roth
wrote:
> Yes it is
>
> Am 10.02.2017 00:46 schrieb "Kant Kodali" :
>
> > If reading from materialized view with a consistency level of quorum am I
> > guaranteed to have the most recent view? o
so there isn't any way to make sure to read after MV had been successfully
updated. is that correct?
On Fri, Feb 10, 2017 at 6:30 AM, Benjamin Roth
wrote:
> Hi Kant
>
> Is it clear now?
> Sorry for the confusion!
>
> Have a nice one
>
> Am 10.02.2017 09:17 schrieb &q
quot;. 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 :
>
> > So R+W > RF doesnt apply for reads on MV right beca
; 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.
>
> 2017-02-10 19:31 GMT+01:00 Kant K
ARY KEY ((a, b), c, d) and
> PRIMARY KEY ((a, b), d, c)
>
> 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
> PRIMARY KEY ((b
gt; Different partition key:
> > >
> > > PRIMARY KEY ((a, b), c, d) and
> > > PRIMARY KEY ((a), b, d, c)
> > >
> > > PRIMARY KEY ((a), b) and
> > > PRIMARY KEY ((b), a)
> > >
> > >
> > > 2017-02-10 19:46 GMT+01:00 Kant Kod
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 abou
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
s, you'll have a large penalty for latency.
>
> On Mon, Feb 20, 2017 at 10:11 PM, Kant Kodali 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" in the statement
>>
+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
> says that "The current impleme
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?
https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/db/rows/BT
Doan 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" a écrit :
>
> Hi All,
>
> Cassandra community had always been recommendi
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 wrote:
> Hi DuyHai,
>
> I am trying to see what are the possible things we can do to get
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!
I had to do brew upgrade jemalloc to fix this issue.
On Mon, Sep 11, 2017 at 4:25 AM, Kant Kodali 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(2981,0x7f
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
> could be at most 3 a
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