Re: Is replication possible with already existing data?

Ideas please, on what I may be doing wrong? On Sat, Oct 24, 2015 at 5:48 PM, Ajay Garg <ajaygargn...@gmail.com> wrote: > Hi All. > > I have been doing extensive testing, and replication works fine, even if > any permuatation of CAS11, CAS12, CAS21, CAS22 are downed and bro

Re: Downtime-Limit for a node in Network-Topology-Replication-Cluster?

analyse that bit... > > Regards, > Vasilis > > On Sat, Oct 24, 2015 at 5:09 PM, Ajay Garg <ajaygargn...@gmail.com> wrote: > >> Thanks a ton Vasileios !! >> >> Just one last question :: >> Does running "nodetool repair" affect the functiona

Re: Downtime-Limit for a node in Network-Topology-Replication-Cluster?

the docs just email them (more info > and contact email here: http://docs.datastax.com/en/ ). > > Regards, > Vasilis > > On Sat, Oct 24, 2015 at 1:04 PM, Ajay Garg <ajaygargn...@gmail.com> wrote: > >> Thanks Vasileios for the reply !!! >> That makes sense !!! &g

Re: Is replication possible with already existing data?

Any ideas, please? To repeat, we are using the exact same cassandra-version on all 4 nodes (2.1.10). On Fri, Oct 23, 2015 at 9:43 AM, Ajay Garg <ajaygargn...@gmail.com> wrote: > Hi Michael. > > Please find below the contents of cassandra.yaml for CAS11 (the files on > the rest

Re: Is replication possible with already existing data?

or CAS12 to be up (although the expectation is that the driver must work fine if ANY of the 4 nodes is up). Thoughts, experts !? :) On Sat, Oct 24, 2015 at 9:40 PM, Ajay Garg <ajaygargn...@gmail.com> wrote: > Ideas please, on what I may be doing wrong? > > On Sat, Oct 24, 2015 at 5:4

Re: Is replication possible with already existing data?

re > advanced and handle bleed out later, but you have to think of latencies. > > Final point, rely on repairs for your data consistency, hints are great > and all but repair is how you make sure you're in sync. > > On Sun, Oct 25, 2015 at 3:10 AM, Ajay Garg <ajaygargn...@gmail.

Re: Is replication possible with already existing data?

> reference for ANY change you make from the default. As you've experienced > here, not all settings are intended to work together. > > HTH, > Steve > > > > On Fri, Oct 23, 2015 at 12:07 PM, Ajay Garg <ajaygargn...@gmail.com> > wrote: > >> Any ideas, please? &g

Some questions about setting public/private IP-Addresses in Cassandra Cluster

Hi All. We have a scenario, where the Application-Server (APP), Node-1 (CAS11), and Node-2 (CAS12) are hosted in DC1. Node-3 (CAS21) and Node-4 (CAS22) are in DC2. The intention is that we provide 4-way redundancy to APP, by specifying CAS11, CAS12, CAS21 and CAS22 as the addresses via

Downtime-Limit for a node in Network-Topology-Replication-Cluster?

If a node in the cluster goes down and comes up, the data gets synced up on this downed node. Is there a limit on the interval for which the node can remain down? Or the data will be synced up even if the node remains down for weeks/months/years? -- Regards, Ajay

Re: Downtime-Limit for a node in Network-Topology-Replication-Cluster?

tml > > My understanding is that if a node remains down for more than > *max_hint_window_in_ms*, then you will need to repair that node. > > Thanks, > Vasilis > > On Sat, Oct 24, 2015 at 7:48 AM, Ajay Garg <ajaygargn...@gmail.com> wrote: > >> If a node in the cluster goes do

Re: Is replication possible with already existing data?

Hi All. I have been doing extensive testing, and replication works fine, even if any permuatation of CAS11, CAS12, CAS21, CAS22 are downed and brought up. Syncing always takes place (obviously, as long as continuous-downtime-value does not exceed *max_hint_window_in_ms*). However, things behave

Can consistency-levels be different for "read" and "write" in Datastax Java-Driver?

Right now, I have setup "LOCAL QUORUM" as the consistency level in the driver, but it seems that "SERIAL" is being used during writes, and I consistently get this error of type :: *Cassandra timeout during write query at consistency SERIAL (3 replica were required but only 0 acknowledged the

Re: Is replication possible with already existing data?

ur particular scenario, after all hints are delivered, both > CAS11 and CAS12 will have the exact same data. > > Cheers! > > Carlos Alonso | Software Engineer | @calonso <https://twitter.com/calonso> > > On 11 October 2015 at 05:21, Ajay Garg <ajaygargn...@gmail.com>

Re: Is replication possible with already existing data?

ll inter_dc_tcp_nodelay: false What changes need to be made, so that whenever a downed server comes back up, the missing data comes back over to it? Thanks and Regards, Ajay On Fri, Oct 23, 2015 at 9:05 AM, Michael Shuler <mich...@pbandjelly.org> wrote:

Doubt regarding consistency-level in Cassandra-2.1.10

Hi All. I have a 2*2 Network-Topology Replication setup, and I run my application via DataStax-driver. I frequently get the errors of type :: *Cassandra timeout during write query at consistency SERIAL (3 replica were required but only 0 acknowledged the write)* I have already tried passing a

Re: Doubt regarding consistency-level in Cassandra-2.1.10

ease your internal node-to-node timeouts . > > On Mon, Nov 2, 2015 at 8:01 PM, Ajay Garg <ajaygargn...@gmail.com> wrote: > >> Hi Eric, >> >> I am sorry, but I don't understand. >> >> If there had been some issue in the configuration, then the >> con

Re: Doubt regarding consistency-level in Cassandra-2.1.10

(didn't really need that), and we have not observed the error since about an hour or so. Thanks Eric and Bryan for the help !!! Thanks and Regards, Ajay On Wed, Nov 4, 2015 at 8:51 AM, Ajay Garg <ajaygargn...@gmail.com> wrote: > Hmm... ok. > > Ideally, we require :: > > a

Re: Doubt regarding consistency-level in Cassandra-2.1.10

nsistency. > > See > http://docs.datastax.com/en/cassandra/2.0/cassandra/dml/dml_ltwt_transaction_c.html > > On Mon, Nov 2, 2015 at 1:29 AM Ajay Garg <ajaygargn...@gmail.com> wrote: > >> Hi All. >> >> I have a 2*2 Network-Topology Replication setup, and I run m

Re: Is replication possible with already existing data?

Thanks a ton Anuja for the help !!! On Fri, Oct 9, 2015 at 12:38 PM, anuja jain <anujaja...@gmail.com> wrote: > Hi Ajay, > > > On Fri, Oct 9, 2015 at 9:00 AM, Ajay Garg <ajaygargn...@gmail.com> wrote: >> > In this case, it will be the responsibility of AP

Is replication possible with already existing data?

Hi All. We have a scenario, where till now we had been using a plain, simple single node, with the keyspace created using :: CREATE KEYSPACE our_db WITH replication = {'class': 'SimpleStrategy', 'replication_factor': '1'} AND durable_writes = true; We now plan to introduce replication (in the

Re: Is replication possible with already existing data?

Hi Sean. Thanks for the reply. On Wed, Oct 7, 2015 at 10:13 PM, wrote: > How many nodes are you planning to add? I guess 2 more. > How many replicas do you want? 1 (original) + 2 (replicas). That makes it a total of 3 copies of every row of data. > In

Re: Is replication possible with already existing data?

On Thu, Oct 8, 2015 at 9:47 AM, Ajay Garg <ajaygargn...@gmail.com> wrote: > Thanks Eric for the reply. > > > On Thu, Oct 8, 2015 at 1:44 AM, Eric Stevens <migh...@gmail.com> wrote: >> If you're at 1 node (N=1) and RF=1 now, and you want to go N=3 RF=3, you >>

Re: Not able to cqlsh on 2.1.9 on Ubuntu 14.04

ddress:@ Of node >>> >>> 2015-09-14 11:31 GMT+01:00 Neha Dave <nehajtriv...@gmail.com>: >>>> >>>> Try >>>> >cqlsh >>>> >>>> regards >>>> Neha >>>> >>>> On Mon, Sep 14, 2015

Re: Not able to cqlsh on 2.1.9 on Ubuntu 14.04

hidden problem. I am heartfully grateful to everyone for bearing with me. Thanks and Regards, Ajay On Tue, Sep 15, 2015 at 10:16 AM, Ajay Garg <ajaygargn...@gmail.com> wrote: > Hi Jared. > > Thanks for your help. > > I made the config-changes. > Also, I changed the seed

Re: Not able to cqlsh on 2.1.9 on Ubuntu 14.04

trap process a script > performs the above. The reason that we set seeds back to empty is that we > don't want nodes coming up/down to cause the config file to change and thus > cassandra to restart needlessly. So far we haven't had any issues with seeds > being set to empty after a nod

Re: Possible to restore ENTIRE data from Cassandra-Schema in one go?

5 at 11:34 AM, Neha Dave <nehajtriv...@gmail.com> wrote: > Havent used it.. but u can try SSTaable Bulk Loader: > > http://docs.datastax.com/en/cassandra/2.0/cassandra/tools/toolsBulkloader_t.html > > regards > Neha > > On Tue, Sep 15, 2015 at 11:21 AM, Ajay Garg <

Re: Getting intermittent errors while taking snapshot

Thanks and Regards, Ajay On Tue, Sep 15, 2015 at 12:04 PM, Ajay Garg <ajaygargn...@gmail.com> wrote: > Hi All. > > Taking snapshots sometimes works, sometimes don't. > Following is the stacktrace whenever

Possible to restore ENTIRE data from Cassandra-Schema in one go?

Hi All. We have a schema on one Cassandra-node, and wish to duplicate the entire schema on another server. Think of this a 2 clusters, each cluster containing one node. We have found the way to dump/restore schema-metainfo at :: https://dzone.com/articles/dumpingloading-schema And

Getting intermittent errors while taking snapshot

Hi All. Taking snapshots sometimes works, sometimes don't. Following is the stacktrace whenever the process fails :: ## ajay@ajay-HP-15-Notebook-PC:/var/lib/cassandra/data/instamsg$ nodetool -h localhost

Test Subject

Testing simple content, as my previous email bounced :( -- Regards, Ajay

Not able to cqlsh on 2.1.9 on Ubuntu 14.04

Hi All. We have setup a Ubuntu-14.04 server, and followed the steps exactly as per http://wiki.apache.org/cassandra/DebianPackaging Installation completes fine, Cassandra starts fine, however cqlsh does not work. We get the error ::

Re: Basic query in setting up secure inter-dc cluster

between the data centers. > - rack: Cassandra encrypts the traffic between the racks. > > regards > > Neha > > > > On Wed, Jan 6, 2016 at 12:48 PM, Singh, Abhijeet <absi...@informatica.com> > wrote: > >> Security is a very wide concept. What exactly d

Basic query in setting up secure inter-dc cluster

Hi All. We have a 2*2 cluster deployed, but no security as of now. As a first stage, we wish to implement inter-dc security. Is it possible to enable security one machine at a time? For example, let's say the machines are DC1M1, DC1M2, DC2M1, DC2M2. If I make the changes JUST IN DC2M2 and

Re: Basic query in setting up secure inter-dc cluster

up". Thanks and Regards, Ajay On Wed, Jan 6, 2016 at 4:16 PM, Ajay Garg <ajaygargn...@gmail.com> wrote: > Thanks everyone for the reply. > > I actually have a fair bit of questions, but it will be nice if someone > could please tell me the flow (implementation-wise), as

Can we set TTL on individual fields (columns) using the Datastax java-driver

Something like :: ## class A { @Id @Column (name = "pojo_key") int key; @Ttl(10) @Column (name = "pojo_temporary_guest") String guest; } ## When I persist, let's say value "ajay" in guest-field

Re: Basic query in setting up secure inter-dc cluster

Thanks and Regards, Ajay On Mon, Apr 18, 2016 at 9:55 AM, Ajay Garg <ajaygargn...@gmail.com> wrote: > Also, wondering what is the difference between "all" and "dc" in > "internode_encryption". > Perhaps my answer lies in this? > > On Mon, Ap

Re: Basic query in setting up secure inter-dc cluster

Also, wondering what is the difference between "all" and "dc" in "internode_encryption". Perhaps my answer lies in this? On Mon, Apr 18, 2016 at 9:51 AM, Ajay Garg <ajaygargn...@gmail.com> wrote: > Ok, trying to wake up this thread again. > > I we

Re: Basic query in setting up secure inter-dc cluster

is the backup centre, while DC1 is the primary-centre connected directly to the application-server. We don't want to screw things if something goes bad in DC1. Will be grateful for pointers. Thanks and Regards, Ajay On Sun, Jan 17, 2016 at 9:09 PM, Ajay Garg <ajaygargn...@gmail.com> wrote: &g

Re: Strange issue wherein cassandra not being started from cron

On Wed, Jan 11, 2017 at 8:29 PM, Martin Schröder <mar...@oneiros.de> wrote: > 2017-01-11 15:42 GMT+01:00 Ajay Garg <ajaygargn...@gmail.com>: > > Tried everything. > > Then try >service cassandra start > or >systemctl start cassandra > > You

Re: Strange issue wherein cassandra not being started from cron

og (or whatever that was). > Absolutely nothing gets written to /var/log/cassandra/system.log (when trying to invoke cassandra via cron). > > Hannu > > > On 11 Jan 2017, at 16.42, Ajay Garg <ajaygargn...@gmail.com> wrote: > > Tried everything. > Every other cron jo

Strange issue wherein cassandra not being started from cron

Hi All. Facing a very weird issue, wherein the command */etc/init.d/cassandra start* causes cassandra to start when the command is run from command-line. However, if I put the above as a cron job ** * * * * /etc/init.d/cassandra start* cassandra never starts. I have checked, and "cron"

Re: Strange issue wherein cassandra not being started from cron

gs? - mine is in path /var/log/cron >>> >>> Thanks & Regards, >>> >>> On Tue, Jan 10, 2017 at 9:45 AM, Ajay Garg <ajaygargn...@gmail.com> >>> wrote: >>> >>>> Hi All. >>>> >>>> Facing a very wei