date:20161008

Re: Proprietary Replication Strategies: Cassandra Driver Support

2016-10-08 Thread Vladimir Yudovin

Well, it can be useful in some scenarios - e.g. temporary tables on nearest or 
the same node.

Best regards, Vladimir Yudovin, 
Winguzone - Hosted Cloud Cassandra on Azure and SoftLayer.
Launch your cluster in minutes.




 On Sat, 08 Oct 2016 13:44:00 -0400 Jeff Jirsajji...@gmail.com 
wrote  

I'm sure that's what he meant, I just disagree that it sounds useful 
 
-- 
Jeff Jirsa 
 
 
 On Oct 8, 2016, at 10:33 AM, Vladimir Yudovin vla...@winguzone.com 
wrote: 
 
 As far as I understand Edward meant to have option determinate actual 
storage node on client side, by driver, disregarding key hash/tokens mechanism. 
 
 Best regards, Vladimir Yudovin, 
 Winguzone - Hosted Cloud Cassandra on Azure and SoftLayer. 
 Launch your cluster in minutes. 
 
 
 
 
  On Sat, 08 Oct 2016 13:17:14 -0400 Jeff Jirsa 
lt;jji...@gmail.comgt; wrote  
 
 That sounds awful, especially since you could just use SimpleStrategy with 
RF=1 and then bootstrap / decom would handle resharding for you as expected. 
 
 -- 
 Jeff Jirsa 
 
 
 gt; On Oct 8, 2016, at 10:09 AM, Edward Capriolo 
lt;edlinuxg...@gmail.comgt; wrote: 
 gt; 
 gt; I have contemplated using LocalStrategy as a "do it yourself 
client side 
 gt; sharding system". 
 gt; 
 gt; On Sat, Oct 8, 2016 at 12:37 AM, Vladimir Yudovin 
lt;vla...@winguzone.comgt; 
 gt; wrote: 
 gt; 
 gt;gt; Hi Prasenjit, 
 gt;gt; I would like to get the replication factors of the 
key-spaces using the 
 gt;gt; strategies in the same way we get the replication factors 
for Simple and 
 gt;gt; NetworkTopology. 
 gt;gt; Actually LocalSarategy has no replication factor: 
 gt;gt; 
 gt;gt; SELECT * FROM system_schema.keyspaces WHERE keyspace_name 
IN ('system', 
 gt;gt; 'system_schema'); 
 gt;gt; keyspace_name | durable_writes | replication 
 gt;gt; 
---++--- 
 gt;gt; - 
 gt;gt; system | True | {'class': 
 gt;gt; 'org.apache.cassandra.locator.LocalStrategy'} 
 gt;gt; system_schema | True | {'class': 
 gt;gt; 'org.apache.cassandra.locator.LocalStrategy'} 
 gt;gt; 
 gt;gt; 
 gt;gt; It's used for internal tables and not accessible to 
users: 
 gt;gt; 
 gt;gt; CREATE KEYSPACE excel WITH replication = {'class': 
'LocalStrategy'}; 
 gt;gt; ConfigurationException: Unable to use given strategy 
class: LocalStrategy 
 gt;gt; is reserved for internal use. 
 gt;gt; 
 gt;gt; 
 gt;gt; Best regards, Vladimir Yudovin, 
 gt;gt; Winguzone - Hosted Cloud Cassandra on Azure and 
SoftLayer. 
 gt;gt; Launch your cluster in minutes. 
 gt;gt; 
 gt;gt; 
 gt;gt; 
 gt;gt; 
 gt;gt;  On Fri, 07 Oct 2016 17:06:09 -0400 Prasenjit 
 gt;gt; Sarkaramp;lt;prasenjit.sar...@datos.ioamp;gt; 
wrote  
 gt;gt; 
 gt;gt; Thanks Vlad and Jeremiah. 
 gt;gt; 
 gt;gt; There were questions about support, so let me address 
that in more detail. 
 gt;gt; 
 gt;gt; If I look at the latest Cassandra python driver, the 
support for 
 gt;gt; LocalStrategy is very limited (code snippet shown below) 
and the support 
 gt;gt; for EverywhereStrategy is non-existent. By limited I mean 
that the 
 gt;gt; Cassandra python driver only provides the name of the 
strategy for 
 gt;gt; LocalStrategy and not much else. 
 gt;gt; 
 gt;gt; What I would like (and happy to help) is for the 
Cassandra python driver to 
 gt;gt; provide support for Local and Everywhere to the same 
extent it is provided 
 gt;gt; for Simple and NetworkTopology. I understand that token 
aware routing is 
 gt;gt; not applicable to either strategy but I would like to get 
the replication 
 gt;gt; factors of the key-spaces using the strategies in the 
same way we get the 
 gt;gt; replication factors for Simple and NetworkTopology. 
 gt;gt; 
 gt;gt; Hope this helps, 
 gt;gt; Prasenjit 
 gt;gt; 
 gt;gt; 
 gt;gt; class LocalStrategy(ReplicationStrategy): 
 gt;gt; def __init__(self, options_map): 
 gt;gt; pass 
 gt;gt; def make_token_replica_map(self, token_to_host_owner, 
ring): 
 gt;gt; return {} 
 gt;gt; def export_for_schema(self): 
 gt;gt; """ 
 gt;gt; Returns a string version of these replication options 
which are 
 gt;gt; suitable for use in a CREATE KEYSPACE statement. 
 gt;gt; """ 
 gt;gt; return "{'class': 'LocalStrategy'}" 
 gt;gt; def __eq__(self, other): 
 gt;gt; return isinstance(other, LocalStrategy) 
 gt;gt; 
 gt;gt; On Fri, Oct 7, 2016 at 11:56 AM, Jeremiah D Jordan 
amp;lt; 
 gt;gt; jeremiah.jor...@gmail.comamp;gt; wrote: 
 gt;gt; 
 gt;gt; amp;gt; What kind of support are you thinking of? 
All drivers should support 
 gt;gt; them 
 gt;gt; amp;gt; already, drivers shouldn’t care about 
replication strategy except when 
 gt;gt; amp;gt; trying to do token aware routing. 
 gt;gt; amp;gt; But since anyone can make a custom 
replication strategy, drivers that 
 gt;gt; do 
 gt;gt; amp;gt; token aware routing just need to handle 
falling back to not doing 
 gt;gt; token 
 gt;gt; amp;gt; aware routing if a replication strategy they 
don’t know about is in 
 gt;gt; use. 
 gt;gt;

Re: Proprietary Replication Strategies: Cassandra Driver Support

2016-10-08 Thread Jeff Jirsa

I'm sure that's what he meant, I just disagree that it sounds useful

-- 
Jeff Jirsa


> On Oct 8, 2016, at 10:33 AM, Vladimir Yudovin  wrote:
> 
> As far as I understand Edward meant to have option determinate actual storage 
> node on client side, by driver, disregarding key hash/tokens mechanism.
> 
> Best regards, Vladimir Yudovin, 
> Winguzone - Hosted Cloud Cassandra on Azure and SoftLayer.
> Launch your cluster in minutes.
> 
> 
> 
> 
>  On Sat, 08 Oct 2016 13:17:14 -0400 Jeff Jirsa jji...@gmail.com 
> wrote  
> 
> That sounds awful, especially since you could just use SimpleStrategy with 
> RF=1 and then bootstrap / decom would handle resharding for you as expected. 
> 
> -- 
> Jeff Jirsa 
> 
> 
>  On Oct 8, 2016, at 10:09 AM, Edward Capriolo 
> edlinuxg...@gmail.com wrote: 
>  
>  I have contemplated using LocalStrategy as a "do it yourself client side 
>  sharding system". 
>  
>  On Sat, Oct 8, 2016 at 12:37 AM, Vladimir Yudovin 
> vla...@winguzone.com 
>  wrote: 
>  
>  Hi Prasenjit, 
>  I would like to get the replication factors of the key-spaces using 
> the 
>  strategies in the same way we get the replication factors for Simple 
> and 
>  NetworkTopology. 
>  Actually LocalSarategy has no replication factor: 
>  
>  SELECT * FROM system_schema.keyspaces WHERE keyspace_name IN 
> ('system', 
>  'system_schema'); 
>  keyspace_name | durable_writes | replication 
>  ---++--- 
>  - 
>  system | True | {'class': 
>  'org.apache.cassandra.locator.LocalStrategy'} 
>  system_schema | True | {'class': 
>  'org.apache.cassandra.locator.LocalStrategy'} 
>  
>  
>  It's used for internal tables and not accessible to users: 
>  
>  CREATE KEYSPACE excel WITH replication = {'class': 'LocalStrategy'}; 
>  ConfigurationException: Unable to use given strategy class: 
> LocalStrategy 
>  is reserved for internal use. 
>  
>  
>  Best regards, Vladimir Yudovin, 
>  Winguzone - Hosted Cloud Cassandra on Azure and SoftLayer. 
>  Launch your cluster in minutes. 
>  
>  
>  
>  
>   On Fri, 07 Oct 2016 17:06:09 -0400 Prasenjit 
>  Sarkarlt;prasenjit.sar...@datos.iogt; wrote  
>  
>  Thanks Vlad and Jeremiah. 
>  
>  There were questions about support, so let me address that in more 
> detail. 
>  
>  If I look at the latest Cassandra python driver, the support for 
>  LocalStrategy is very limited (code snippet shown below) and the 
> support 
>  for EverywhereStrategy is non-existent. By limited I mean that the 
>  Cassandra python driver only provides the name of the strategy for 
>  LocalStrategy and not much else. 
>  
>  What I would like (and happy to help) is for the Cassandra python 
> driver to 
>  provide support for Local and Everywhere to the same extent it is 
> provided 
>  for Simple and NetworkTopology. I understand that token aware 
> routing is 
>  not applicable to either strategy but I would like to get the 
> replication 
>  factors of the key-spaces using the strategies in the same way we 
> get the 
>  replication factors for Simple and NetworkTopology. 
>  
>  Hope this helps, 
>  Prasenjit 
>  
>  
>  class LocalStrategy(ReplicationStrategy): 
>  def __init__(self, options_map): 
>  pass 
>  def make_token_replica_map(self, token_to_host_owner, ring): 
>  return {} 
>  def export_for_schema(self): 
>  """ 
>  Returns a string version of these replication options which are 
>  suitable for use in a CREATE KEYSPACE statement. 
>  """ 
>  return "{'class': 'LocalStrategy'}" 
>  def __eq__(self, other): 
>  return isinstance(other, LocalStrategy) 
>  
>  On Fri, Oct 7, 2016 at 11:56 AM, Jeremiah D Jordan lt; 
>  jeremiah.jor...@gmail.comgt; wrote: 
>  
>  gt; What kind of support are you thinking of? All drivers 
> should support 
>  them 
>  gt; already, drivers shouldn’t care about replication strategy 
> except when 
>  gt; trying to do token aware routing. 
>  gt; But since anyone can make a custom replication strategy, 
> drivers that 
>  do 
>  gt; token aware routing just need to handle falling back to not 
> doing 
>  token 
>  gt; aware routing if a replication strategy they don’t know 
> about is in 
>  use. 
>  gt; All the open sources drivers I know of do this, so they 
> should all 
>  gt; “support” those strategies already. 
>  gt; 
>  gt; -Jeremiah 
>  gt; 
>  gt; gt; On Oct 7, 2016, at 1:02 PM, Prasenjit Sarkar  
>  lt;prasenjit.sar...@datos.iogt;
>  gt; wrote: 
>  gt; gt; 
>  gt; gt; Hi everyone, 
>  gt; gt; 
>  gt; gt; To the best of my understanding that Datastax has 
> proprietary 
>  replication 
>  gt; gt; strategies: Local and Everywhere which are not 
> part of the open 
>  source 
>  gt; gt; Apache Cassandra project. 
>  gt; gt; 
>  gt; gt; Do we know of any plans in the open source 
> Cassandra driver 
>  community to 
>  gt; gt; support these two replication strategies? Would 
> Datastax have a 
>  licensing 
>  gt; gt; concern if the

Re: Re: Proprietary Replication Strategies: Cassandra Driver Support

2016-10-08 Thread Vladimir Yudovin

As far as I understand Edward meant to have option determinate actual storage 
node on client side, by driver, disregarding key hash/tokens mechanism.

Best regards, Vladimir Yudovin, 
Winguzone - Hosted Cloud Cassandra on Azure and SoftLayer.
Launch your cluster in minutes.




 On Sat, 08 Oct 2016 13:17:14 -0400 Jeff Jirsa jji...@gmail.com 
wrote  

That sounds awful, especially since you could just use SimpleStrategy with RF=1 
and then bootstrap / decom would handle resharding for you as expected. 
 
-- 
Jeff Jirsa 
 
 
 On Oct 8, 2016, at 10:09 AM, Edward Capriolo edlinuxg...@gmail.com 
wrote: 
 
 I have contemplated using LocalStrategy as a "do it yourself client side 
 sharding system". 
 
 On Sat, Oct 8, 2016 at 12:37 AM, Vladimir Yudovin 
vla...@winguzone.com 
 wrote: 
 
 Hi Prasenjit, 
 I would like to get the replication factors of the key-spaces using 
the 
 strategies in the same way we get the replication factors for Simple 
and 
 NetworkTopology. 
 Actually LocalSarategy has no replication factor: 
 
 SELECT * FROM system_schema.keyspaces WHERE keyspace_name IN 
('system', 
 'system_schema'); 
 keyspace_name | durable_writes | replication 
 ---++--- 
 - 
 system | True | {'class': 
 'org.apache.cassandra.locator.LocalStrategy'} 
 system_schema | True | {'class': 
 'org.apache.cassandra.locator.LocalStrategy'} 
 
 
 It's used for internal tables and not accessible to users: 
 
 CREATE KEYSPACE excel WITH replication = {'class': 'LocalStrategy'}; 
 ConfigurationException: Unable to use given strategy class: 
LocalStrategy 
 is reserved for internal use. 
 
 
 Best regards, Vladimir Yudovin, 
 Winguzone - Hosted Cloud Cassandra on Azure and SoftLayer. 
 Launch your cluster in minutes. 
 
 
 
 
  On Fri, 07 Oct 2016 17:06:09 -0400 Prasenjit 
 Sarkarlt;prasenjit.sar...@datos.iogt; wrote  
 
 Thanks Vlad and Jeremiah. 
 
 There were questions about support, so let me address that in more 
detail. 
 
 If I look at the latest Cassandra python driver, the support for 
 LocalStrategy is very limited (code snippet shown below) and the 
support 
 for EverywhereStrategy is non-existent. By limited I mean that the 
 Cassandra python driver only provides the name of the strategy for 
 LocalStrategy and not much else. 
 
 What I would like (and happy to help) is for the Cassandra python 
driver to 
 provide support for Local and Everywhere to the same extent it is 
provided 
 for Simple and NetworkTopology. I understand that token aware routing 
is 
 not applicable to either strategy but I would like to get the 
replication 
 factors of the key-spaces using the strategies in the same way we get 
the 
 replication factors for Simple and NetworkTopology. 
 
 Hope this helps, 
 Prasenjit 
 
 
 class LocalStrategy(ReplicationStrategy): 
 def __init__(self, options_map): 
 pass 
 def make_token_replica_map(self, token_to_host_owner, ring): 
 return {} 
 def export_for_schema(self): 
 """ 
 Returns a string version of these replication options which are 
 suitable for use in a CREATE KEYSPACE statement. 
 """ 
 return "{'class': 'LocalStrategy'}" 
 def __eq__(self, other): 
 return isinstance(other, LocalStrategy) 
 
 On Fri, Oct 7, 2016 at 11:56 AM, Jeremiah D Jordan lt; 
 jeremiah.jor...@gmail.comgt; wrote: 
 
 gt; What kind of support are you thinking of? All drivers should 
support 
 them 
 gt; already, drivers shouldn’t care about replication strategy 
except when 
 gt; trying to do token aware routing. 
 gt; But since anyone can make a custom replication strategy, 
drivers that 
 do 
 gt; token aware routing just need to handle falling back to not 
doing 
 token 
 gt; aware routing if a replication strategy they don’t know about 
is in 
 use. 
 gt; All the open sources drivers I know of do this, so they 
should all 
 gt; “support” those strategies already. 
 gt; 
 gt; -Jeremiah 
 gt; 
 gt; gt; On Oct 7, 2016, at 1:02 PM, Prasenjit Sarkar  
 lt;prasenjit.sar...@datos.iogt; 
 gt; wrote: 
 gt; gt; 
 gt; gt; Hi everyone, 
 gt; gt; 
 gt; gt; To the best of my understanding that Datastax has 
proprietary 
 replication 
 gt; gt; strategies: Local and Everywhere which are not part 
of the open 
 source 
 gt; gt; Apache Cassandra project. 
 gt; gt; 
 gt; gt; Do we know of any plans in the open source Cassandra 
driver 
 community to 
 gt; gt; support these two replication strategies? Would 
Datastax have a 
 licensing 
 gt; gt; concern if the open source driver community 
supported these 
 strategies? 
 gt; I'm 
 gt; gt; fairly new here and would like to understand the 
dynamics. 
 gt; gt; 
 gt; gt; Thanks, 
 gt; gt; Prasenjit 
 gt; 
 gt;

Re: Proprietary Replication Strategies: Cassandra Driver Support

2016-10-08 Thread Jeff Jirsa

That sounds awful, especially since you could just use SimpleStrategy with RF=1 
and then bootstrap / decom would handle resharding for you as expected.

-- 
Jeff Jirsa


> On Oct 8, 2016, at 10:09 AM, Edward Capriolo  wrote:
> 
> I have contemplated using LocalStrategy as a "do it yourself client side
> sharding system".
> 
> On Sat, Oct 8, 2016 at 12:37 AM, Vladimir Yudovin 
> wrote:
> 
>> Hi Prasenjit,
>> I would like to get the replication factors of the key-spaces using the
>> strategies in the same way we get the replication factors for Simple and
>> NetworkTopology.
>> Actually LocalSarategy has no replication factor:
>> 
>> SELECT * FROM system_schema.keyspaces WHERE keyspace_name IN ('system',
>> 'system_schema');
>> keyspace_name | durable_writes | replication
>> ---++---
>> -
>>system   | True | {'class':
>> 'org.apache.cassandra.locator.LocalStrategy'}
>> system_schema | True | {'class':
>> 'org.apache.cassandra.locator.LocalStrategy'}
>> 
>> 
>> It's used for internal tables and not accessible to users:
>> 
>> CREATE KEYSPACE excel WITH replication = {'class': 'LocalStrategy'};
>> ConfigurationException: Unable to use given strategy class: LocalStrategy
>> is reserved for internal use.
>> 
>> 
>> Best regards, Vladimir Yudovin,
>> Winguzone - Hosted Cloud Cassandra on Azure and SoftLayer.
>> Launch your cluster in minutes.
>> 
>> 
>> 
>> 
>>  On Fri, 07 Oct 2016 17:06:09 -0400 Prasenjit
>> Sarkarprasenjit.sar...@datos.io wrote 
>> 
>> Thanks Vlad and Jeremiah.
>> 
>> There were questions about support, so let me address that in more detail.
>> 
>> If I look at the latest Cassandra python driver, the support for
>> LocalStrategy is very limited (code snippet shown below) and the support
>> for EverywhereStrategy is non-existent. By limited I mean that the
>> Cassandra python driver only provides the name of the strategy for
>> LocalStrategy and not much else.
>> 
>> What I would like (and happy to help) is for the Cassandra python driver to
>> provide support for Local and Everywhere to the same extent it is provided
>> for Simple and NetworkTopology. I understand that token aware routing is
>> not applicable to either strategy but I would like to get the replication
>> factors of the key-spaces using the strategies in the same way we get the
>> replication factors for Simple and NetworkTopology.
>> 
>> Hope this helps,
>> Prasenjit
>> 
>> 
>> class LocalStrategy(ReplicationStrategy):
>> def __init__(self, options_map):
>> pass
>> def make_token_replica_map(self, token_to_host_owner, ring):
>> return {}
>> def export_for_schema(self):
>> """
>> Returns a string version of these replication options which are
>> suitable for use in a CREATE KEYSPACE statement.
>> """
>> return "{'class': 'LocalStrategy'}"
>> def __eq__(self, other):
>> return isinstance(other, LocalStrategy)
>> 
>> On Fri, Oct 7, 2016 at 11:56 AM, Jeremiah D Jordan 
>> jeremiah.jor...@gmail.com wrote:
>> 
>>  What kind of support are you thinking of? All drivers should support
>> them
>>  already, drivers shouldn’t care about replication strategy except when
>>  trying to do token aware routing.
>>  But since anyone can make a custom replication strategy, drivers that
>> do
>>  token aware routing just need to handle falling back to not doing
>> token
>>  aware routing if a replication strategy they don’t know about is in
>> use.
>>  All the open sources drivers I know of do this, so they should all
>>  “support” those strategies already.
>> 
>>  -Jeremiah
>> 
>>   On Oct 7, 2016, at 1:02 PM, Prasenjit Sarkar &
>> lt;prasenjit.sar...@datos.io
>>  wrote:
>>  
>>   Hi everyone,
>>  
>>   To the best of my understanding that Datastax has proprietary
>> replication
>>   strategies: Local and Everywhere which are not part of the open
>> source
>>   Apache Cassandra project.
>>  
>>   Do we know of any plans in the open source Cassandra driver
>> community to
>>   support these two replication strategies? Would Datastax have a
>> licensing
>>   concern if the open source driver community supported these
>> strategies?
>>  I'm
>>   fairly new here and would like to understand the dynamics.
>>  
>>   Thanks,
>>   Prasenjit
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>>

Re: Proprietary Replication Strategies: Cassandra Driver Support

2016-10-08 Thread Edward Capriolo

I have contemplated using LocalStrategy as a "do it yourself client side
sharding system".

On Sat, Oct 8, 2016 at 12:37 AM, Vladimir Yudovin 
wrote:

> Hi Prasenjit,
> I would like to get the replication factors of the key-spaces using the
> strategies in the same way we get the replication factors for Simple and
> NetworkTopology.
>  Actually LocalSarategy has no replication factor:
>
> SELECT * FROM system_schema.keyspaces WHERE keyspace_name IN ('system',
> 'system_schema');
>  keyspace_name | durable_writes | replication
> ---++---
> -
> system   | True | {'class':
> 'org.apache.cassandra.locator.LocalStrategy'}
>  system_schema | True | {'class':
> 'org.apache.cassandra.locator.LocalStrategy'}
>
>
> It's used for internal tables and not accessible to users:
>
> CREATE KEYSPACE excel WITH replication = {'class': 'LocalStrategy'};
> ConfigurationException: Unable to use given strategy class: LocalStrategy
> is reserved for internal use.
>
>
> Best regards, Vladimir Yudovin,
> Winguzone - Hosted Cloud Cassandra on Azure and SoftLayer.
> Launch your cluster in minutes.
>
>
>
>
>  On Fri, 07 Oct 2016 17:06:09 -0400 Prasenjit
> Sarkarprasenjit.sar...@datos.io wrote 
>
> Thanks Vlad and Jeremiah.
>
> There were questions about support, so let me address that in more detail.
>
> If I look at the latest Cassandra python driver, the support for
> LocalStrategy is very limited (code snippet shown below) and the support
> for EverywhereStrategy is non-existent. By limited I mean that the
> Cassandra python driver only provides the name of the strategy for
> LocalStrategy and not much else.
>
> What I would like (and happy to help) is for the Cassandra python driver to
> provide support for Local and Everywhere to the same extent it is provided
> for Simple and NetworkTopology. I understand that token aware routing is
> not applicable to either strategy but I would like to get the replication
> factors of the key-spaces using the strategies in the same way we get the
> replication factors for Simple and NetworkTopology.
>
> Hope this helps,
> Prasenjit
>
>
> class LocalStrategy(ReplicationStrategy):
> def __init__(self, options_map):
> pass
> def make_token_replica_map(self, token_to_host_owner, ring):
> return {}
> def export_for_schema(self):
> """
> Returns a string version of these replication options which are
> suitable for use in a CREATE KEYSPACE statement.
> """
> return "{'class': 'LocalStrategy'}"
> def __eq__(self, other):
> return isinstance(other, LocalStrategy)
>
> On Fri, Oct 7, 2016 at 11:56 AM, Jeremiah D Jordan 
> jeremiah.jor...@gmail.com wrote:
>
>  What kind of support are you thinking of? All drivers should support
> them
>  already, drivers shouldn’t care about replication strategy except when
>  trying to do token aware routing.
>  But since anyone can make a custom replication strategy, drivers that
> do
>  token aware routing just need to handle falling back to not doing
> token
>  aware routing if a replication strategy they don’t know about is in
> use.
>  All the open sources drivers I know of do this, so they should all
>  “support” those strategies already.
> 
>  -Jeremiah
> 
>   On Oct 7, 2016, at 1:02 PM, Prasenjit Sarkar &
> lt;prasenjit.sar...@datos.io
>  wrote:
>  
>   Hi everyone,
>  
>   To the best of my understanding that Datastax has proprietary
> replication
>   strategies: Local and Everywhere which are not part of the open
> source
>   Apache Cassandra project.
>  
>   Do we know of any plans in the open source Cassandra driver
> community to
>   support these two replication strategies? Would Datastax have a
> licensing
>   concern if the open source driver community supported these
> strategies?
>  I'm
>   fairly new here and would like to understand the dynamics.
>  
>   Thanks,
>   Prasenjit
> 
> 
>
>
>
>
>
>

Re: Question regd CDC in cassandra 3.7+

2016-10-08 Thread Sridhar Nemani

Thanks for clarifying that. 
How can I use commitlogreader? Are there any examples for it? Does this mean I 
can only use through Java?

-Sridhar

> On Oct 8, 2016, at 3:17 AM, DuyHai Doan  wrote:
> 
> You need to use the CommitLogReader, there is no way to access CDC data
> using CQL. I'm not even sure it will be possible one day
> 
> On Fri, Oct 7, 2016 at 11:19 PM, sridhar nemani 
> wrote:
> 
>> Hi,
>> 
>> 
>> 
>> I am fairly new to Cassandra. I have a requirement to be able to read any
>> changes to tables, as in inserts deletes or updates from a given timestamp
>> onwards. I believe the new implementation of CDC should help me with this.
>> However, with CDC enabled, I want to know if there is yet a way to read the
>> data inserts,updates or deletes to a table through CQL. I do see
>> implementations of CommitLogReader. But, I want to know if it is possible
>> to read the changes using CQL. If yes, how?
>> 
>> Please advise.
>> 
>> 
>> 
>> Thank you,
>> Sridhar
>>

Re: Question regd CDC in cassandra 3.7+

2016-10-08 Thread DuyHai Doan

You need to use the CommitLogReader, there is no way to access CDC data
using CQL. I'm not even sure it will be possible one day

On Fri, Oct 7, 2016 at 11:19 PM, sridhar nemani 
wrote:

> Hi,
>
>
>
> I am fairly new to Cassandra. I have a requirement to be able to read any
> changes to tables, as in inserts deletes or updates from a given timestamp
> onwards. I believe the new implementation of CDC should help me with this.
> However, with CDC enabled, I want to know if there is yet a way to read the
> data inserts,updates or deletes to a table through CQL. I do see
> implementations of CommitLogReader. But, I want to know if it is possible
> to read the changes using CQL. If yes, how?
>
> Please advise.
>
>
>
> Thank you,
> Sridhar
>

Re: Proprietary Replication Strategies: Cassandra Driver Support

Re: Proprietary Replication Strategies: Cassandra Driver Support

Re: Re: Proprietary Replication Strategies: Cassandra Driver Support

Re: Proprietary Replication Strategies: Cassandra Driver Support

Re: Proprietary Replication Strategies: Cassandra Driver Support

Re: Question regd CDC in cassandra 3.7+

Re: Question regd CDC in cassandra 3.7+

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