Cassandra counters

known issues in 2.1 using UNLOGGED batch for counter update? Thanks Ajay

Re: Cassandra counters

Any pointers on this?. In 2.1, when updating the counter with UNLOGGED batch using timestamp isn't safe as other column update with consistency level (with timestamp counter update can be idempotent? ). Thanks Ajay On 09-Jul-2015 11:47 am, "Ajay" wrote: > > Hi, >

Re: Can't connect to Cassandra server

Try with the correct IP address as below: cqlsh 192.248.15.219 -u sinmin -p xx CQL documentation - http://docs.datastax.com/en/cql/3.0/cql/cql_reference/cqlsh.html On Sun, Jul 19, 2015 at 2:00 PM, Chamila Wijayarathna < cdwijayarat...@gmail.com> wrote: > Hello all, > > After starting cassan

Spark SQL Vs CQL performance on Cassandra

a') 2) It takes around .6 second using Spark (either SELECT * FROM users WHERE name='Anna' or javaFunctions(sc).cassandraTable("test", "people", mapRowTo(Person.class)).where("name=?", "Anna"); Please let me know if I am missing something in

Cassandra for Analytics?

will have writes and reads (but reads will be more say 40% writes and 60% reads). We are planning to use Spark as the in memory computation engine. Thanks Ajay

Re: Cassandra for Analytics?

) | Streaming processing (Spark Streaming or Storm. Yet to be decided. Spark streaming is relatively new) | My SQL/Mongo/Real Time data Since we are planning to build it as a service, we cannot consider a particular data access pattern. Thanks Ajay On Thu, Dec 18

Re: Cassandra for Analytics?

also plans to support Spark SQL soon). The idea is to abstract the business users from the storage solutions (more than one. Cassandra/HBase & Mongo). Thanks Ajay On Thu, Dec 18, 2014 at 8:01 PM, Peter Lin wrote: > > > by data warehouse, what kind do you mean? > > is it the tr

Throughput Vs Latency

time taken to accept input, process and respond back. If Latency is more how come the Throughput is high? Thanks Ajay

Re: Throughput Vs Latency

Thanks Thomas for the clarification. If I use the Consistency level of QUORUM for Read and Write, the Latency would affect the Throughput right? Thanks Ajay On Fri, Dec 26, 2014 at 11:15 AM, Job Thomas wrote: > Hi, > > First of all,the write latency of cassandra is not high(Rea

Re: Throughput Vs Latency

Hi Thomas, I am little confused when you say multithreaded client. Actually we don't explicitly invoke read on multiple servers (for replicated data) from the client code. So how does multithreaded client fix this? Thanks Ajay On Fri, Dec 26, 2014 at 12:08 PM, Job Thomas wrote: >

Counter Column

Hi, If the nodes of Cassandra ring are in different timezone, could it affect the counter column as it depends on the timestamp? Thanks Ajay

Re: Counter Column

Thanks. I went through some articles which mentioned that the client to pass the timestamp for insert and update. Is that anyway we can avoid it and Cassandra assume the current time of the server? Thanks Ajay On Dec 26, 2014 10:50 PM, "Eric Stevens" wrote: > Timestamps

User click count

Hi, Is it better to use Counter to User click count than maintaining creating new row as user id : timestamp and count it. Basically we want to track the user clicks and use the same for hourly/daily/monthly report. Thanks Ajay

Re: User click count

Hi, So you mean to say counters are not accurate? (It is highly likely that multiple parallel threads trying to increment the counter as users click the links). Thanks Ajay On Mon, Dec 29, 2014 at 4:49 PM, Janne Jalkanen wrote: > > Hi! > > It’s really a tradeoff between accurate

Re: User click count

o the data will be huge with more writes and more rows to count for reads right? Thanks Ajay On Mon, Dec 29, 2014 at 7:10 PM, Alain RODRIGUEZ wrote: > Hi Ajay, > > Here is a good explanation you might want to read. > > > http://www.datastax.com/dev/blog/whats-new-in-cassandra-2-1-

Re: User click count

) between more rows Vs more columns as Cassandra deletes them through tombstones (say by default 20 days). Thanks Ajay On Mon, Dec 29, 2014 at 7:47 PM, Eric Stevens wrote: > > If the counters get incorrect, it could't be corrected > > You'd have to store something that all

Re: User click count

)? Thanks Ajay On Tue, Dec 30, 2014 at 10:37 PM, Janne Jalkanen wrote: > > Hi! > > Yes, since all the writes for a partition (or row if you speak Thrift) > always go to the same replicas, you will need to design to avoid hotspots - > a pure day row will cause all the writes for

Re: User click count

Thanks Eric. Happy new year 2015 for all Cassandra developers and Users :). This group seems the most active of apache big data projects. Will come back with more questions :) Thanks Ajay On Dec 31, 2014 8:02 PM, "Eric Stevens" wrote: > You can totally avoid the impact of

Stable cassandra build for production usage

Hi All, For my research and learning I am using Cassandra 2.1.2. But I see couple of mail threads going on issues in 2.1.2. So what is the stable or popular build for production in Cassandra 2.x series. Thanks Ajay

Cassandra nodes in VirtualBox

"java.lang.RuntimeException: Unable to news with any seeds". What could be the reason? Thanks Ajay

Re: Cassandra nodes in VirtualBox

Neha, This is just for a trial set up. Anyway, thanks for the suggestion(more than 1 seed node). I figured out the problem. The Node2 was having the incorrect Cluster name. The error seems to be misleading though. Thanks Ajay Garga On Mon, Jan 5, 2015 at 4:21 PM, Neha Trivedi wrote: >

Token function in CQL for composite partition key

use the token function in the CQL. Thanks Ajay

Re: Token function in CQL for composite partition key

for a specific Ad Id(one or more may be). How do we support 1 and 2 with a same data model? (I thought to use Ad ID + Hour data as Partition key to avoid hotspots) Thanks Ajay On Wed, Jan 7, 2015 at 6:34 PM, Sylvain Lebresne wrote: > On Wed, Jan 7, 2015 at 10:18 AM, Ajay wrote: >

Re: Keyspace uppercase name issues

We noticed the same issue. From the cassandra-cli, it allows to use upper case or mixed case Keyspace name but from cqlsh it auto converts to lower case. Thanks Ajay On Wed, Jan 7, 2015 at 9:44 PM, Harel Gliksman wrote: > Hi, > > We have a Cassandra cluster with Keyspaces that wer

User audit in Cassandra

?. Also is it recommended to enable system_trace in production or to know how many sessions started by a user? Thanks Ajay

Re: User audit in Cassandra

Thanks Tyler Hobbs. We need to capture what are the queries ran by a user in a session and its time taken. (don't need query plan or so). Is that possible? With Authenticator we can capture only the session creation right? Thanks Ajay On Sat, Jan 10, 2015 at 6:07 AM, Tyler Hobbs

Re: Cassandra primary key design to cater range query

ght need to reorder the columns like PRIMARY KEY((prodgroup), productid, status). Thanks Ajay On Sat, Jan 10, 2015 at 6:03 AM, Tyler Hobbs wrote: > Your proposed model for the table to handle the last query looks good, so > I would stick with that. > > On Mon, Jan 5, 2015 at 5:45 AM, N

Performance difference between Regular Statement Vs PreparedStatement

same Session object in multiple threads. Cassandra version : 2.0.11 Driver version : 2.1.4 Thanks Ajay

Re: Performance difference between Regular Statement Vs PreparedStatement

Thanks Eric. I didn't know the point about the token aware routing. But with points 2 and 3 I didn't notice much improvement with prepared statement. I have 2 cassandra nodes running in virtual boxes in the same machine and test client running in the same machine. Thanks Aja

Pagination support on Java Driver Query API

query contains ORDER BY clause. Is there any other way to achieve the pagination support? Thanks Ajay

Re: Pagination support on Java Driver Query API

Thanks Alex. But is there any workaround possible?. I can't believe that everyone read & process all rows at once (without pagination). Thanks Ajay On Feb 10, 2015 11:46 PM, "Alex Popescu" wrote: > > On Tue, Feb 10, 2015 at 4:59 AM, Ajay wrote: > >>

Re: Pagination support on Java Driver Query API

ion for all preceding clustering key columns. With this I cannot get the pagination correct. Thanks Ajay > I can't believe that everyone read & process all rows at once (without pagination). Probably not too many people try to read all rows in a table as a single rolling operation

Re: Pagination support on Java Driver Query API

Basically I am trying different queries with your approach. One such query is like Select * from mycf where condition on partition key order by ck1 asc, ck2 desc where ck1 and ck2 are clustering keys in that order. Here how do we achieve pagination support? Thanks Ajay On Feb 11, 2015 11:16 PM

Re: Pagination support on Java Driver Query API

h the driver. Thanks Ajay On Feb 12, 2015 8:22 PM, "Eric Stevens" wrote: > Your page state then needs to track the last ck1 and last ck2 you saw. > Pages 2+ will end up needing to be up to two queries if the first query > doesn't fill the page size. > > CREATE TABLE

Re: Pagination support on Java Driver Query API

The syntax suggested by Ondrej is not working in some case in 2.0.11 and logged an issue for the same. https://issues.apache.org/jira/browse/CASSANDRA-8797 Thanks Ajay On Feb 12, 2015 11:01 PM, "Bulat Shakirzyanov" < bulat.shakirzya...@datastax.com> wrote: > Fixed my Mail.

Caching the PreparedStatement (Java driver)

Java driver code, the Cluster class stores the PreparedStatements as a weak reference (to rebuild when a node is down or a new node added). Thanks Ajay

Re: Caching the PreparedStatement (Java driver)

pare the same query more than once (using the same Session and Cluster instance which I think doesn't matter)?. Thanks Ajay On Sat, Feb 28, 2015 at 9:17 AM, Ajay wrote: > Thanks Olivier. > > Most of the REST query calls would come from other applications to > write/read to/from Cas

Optimal Batch size (Unlogged) for Java driver

-6487 How do we compute(approximately using ColumnDefintions or ColumnMetadata) the size of a row of a column family from the client side using Cassandra Java driver? Thanks Ajay

Re: Optimal Batch size (Unlogged) for Java driver

thing? Thanks Ajay On 02-Mar-2015 12:13 pm, "Ankush Goyal" wrote: > Hi Ajay, > > I would suggest, looking at the approximate size of individual elements in > the batch, and based on that compute max size (chunk size). > > Its not really a straightforward calcul

Re: Optimal Batch size (Unlogged) for Java driver

Hi Ankush, We are already using Prepared statement and our case is a time series data as well. Thanks Ajay On 02-Mar-2015 10:00 pm, "Ankush Goyal" wrote: > Ajay, > > First of all, I would recommend using PreparedStatements, so you only > would be sending the variable bo

Adding a Cassandra node using OpsCenter

Hi, While adding a Cassandra node using OpsCenter (which is recommended), the versions of Cassandra (Datastax community edition) shows only 2.0.9 and not later versions in 2.0.x. Is there a reason behind it? 2.0.9 is recommended than 2.0.11? Thanks Ajay

Steps to do after schema changes

Hi, Are there any steps to do (like nodetool or restart node) or any precautions after schema changes are done in a column family say adding a new column or modifying any table properties? Thanks Ajay

Re: Adding a Cassandra node using OpsCenter

Is there a separate forum for Opscenter? Thanks Ajay On 11-Mar-2015 4:16 pm, "Ajay" wrote: > Hi, > > While adding a Cassandra node using OpsCenter (which is recommended), the > versions of Cassandra (Datastax community edition) shows only 2.0.9 and not > later vers

Re: Stable cassandra build for production usage

that we are deploying Cassandra cluster for the 1st time (so likely that we add more data centers/nodes and schema changes in the initial few months) Thanks Ajay On Thu, Jan 1, 2015 at 9:49 PM, Neha Trivedi wrote: > Use 2.0.11 for production > > On Wed, Dec 31, 2014 at 11:50 PM, Ro

Re: Steps to do after schema changes

Thanks Mark. - Ajay On 12-Mar-2015 11:08 pm, "Mark Reddy" wrote: > It's always good to run "nodetool describecluster" after a schema change, > this will show you all the nodes in your cluster and what schema version > they have. If they have different versi

Re: Adding a Cassandra node using OpsCenter

Thanks Nick. Does it mean that only adding a new node with 2.0.10 or later is a problem?. If a new node added manually can be monitored from Opscenter? Thanks Ajay On 12-Mar-2015 10:19 pm, "Nick Bailey" wrote: > There isn't an OpsCenter specific mailing list no. > >

Re: Stable cassandra build for production usage

Hi, Now that 2.0.13 is out, I don't see nodetool cleanup issue( https://issues.apache.org/jira/browse/CASSANDRA-8718) been fixed yet. The bug show priority Minor. Anybody facing this issue?. Thanks Ajay On Thu, Mar 12, 2015 at 11:41 PM, Robert Coli wrote: > On Thu, Mar 12, 2015 at

Re: Stable cassandra build for production usage

Yes we see https://issues.apache.org/jira/browse/CASSANDRA-8716 in our testing Thanks Ajay On Tue, Mar 17, 2015 at 3:20 PM, Marcus Eriksson wrote: > Do you see the segfault or do you see > https://issues.apache.org/jira/browse/CASSANDRA-8716 ? > > On Tue, Mar 17, 2015 at 10:34 AM,

When to use STCS/DTCS/LCS

Hi, What are the guidelines on when to use STCS/DTCS/LCS?. Most preferred way to test it with each of them and find the best fit. But is there some guidelines or best practices (out of experience) which one to use when? Thanks Ajay

Re: Availability testing of Cassandra nodes

Adding Java driver forum. Even we like to know more on this. - Ajay On Wed, Apr 8, 2015 at 8:15 PM, Jack Krupansky wrote: > Just a couple of quick comments: > > 1. The driver is supposed to be doing availability and load balancing > already. > 2. If your cluster is lightly l

Hive support on Cassandra

Hi, Does Apache Cassandra (not DSE) support Hive Integration? I found couple of open source efforts but nothing is available currently. Thanks Ajay

Re: Hive support on Cassandra

Thanks everyone. Basically we are looking at Hive because it supports advanced queries (CQL is limited to the data model). Does Stratio supports similar to Hive? Thanks Ajay On Thu, May 7, 2015 at 10:33 PM, Andres de la Peña wrote: > You may also find interesting https://github.com/Stra

Re: Caching the PreparedStatement (Java driver)

cassandra nodes restart. Does the server prepared statements cache is persisted or in memory?. If it is in memory, how do we handle stale prepared statement in the cache? Thanks Ajay On Fri, May 15, 2015 at 6:28 PM, ja wrote: > Hi, > > Isn't it a good to have feature for the java driver

Hbase vs Cassandra

Hi, I need some info on Hbase vs Cassandra as a data store (in general plus specific to time series data). The comparison in the following helps: 1: features 2: deployment and monitoring 3: performance 4: anything else Thanks Ajay

Re: Hbase vs Cassandra

ving an eventually consistent index, similar to what Cassandra has, is easy in HBase, but making it as consistent as the rest of HBase is hard) Thanks Ajay > > On May 29, 2015, at 12:09 PM, Ajay wrote: > > Hi, > > I need some info on Hbase vs Cassandra as a data store (in g

Re: Hbase vs Cassandra

se path. A Cassandra > cluster can be handled by a single engineer and is, in my opinion, easier > to maintain. > *>>> This is the most popular reason for Cassandra over HBase. But this alone is not a sufficient driver. * > Cheers, > Jens > > On Mon, Jun 8, 2015 at

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

Hi Everyone. Kindly reply in "yes" or "no", as to whether it is possible to setup encryption only between particular pair of nodes? Or is it an "all" or "none" feature, where encryption is present between EVERY PAIR of nodes, or in NO PAIR of nodes.

Strange issue wherein cassandra not being started from cron

;cron" service is running. Any ideas what might be wrong? I am pasting the cassandra script for brevity. Thanks and Regards, Ajay #! /bin/sh ### BEGIN INIT INFO # Provides:

Re: Strange issue wherein cassandra not being started from cron

nvironment you see when >> you log in. Also, why put Cassandra on a cron? >> On Mon, Jan 9, 2017 at 9:47 PM Bhuvan Rawal wrote: >> >>> Hi Ajay, >>> >>> Have you had a look at cron logs? - mine is in path /var/log/cron >>> >>> Thanks &am

Re: Strange issue wherein cassandra not being started from cron

On Wed, Jan 11, 2017 at 8:29 PM, Martin Schröder wrote: > 2017-01-11 15:42 GMT+01:00 Ajay Garg : > > Tried everything. > > Then try >service cassandra start > or >systemctl start cassandra > > You still haven't explained to us why you want to start cas

Re: Strange issue wherein cassandra not being started from cron

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 wrote: > > Tried everything. > Every other cron job/script I try works, just the cassandra-service does >

Test Subject

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

Not able to cqlsh on 2.1.9 on Ubuntu 14.04

:: ### ajay@comp:~$ cqlsh Connection error: ('Unable to connect to any servers', {'127.0.0.1': error(None, "Tried connecting to [('127.0.

Re: Not able to cqlsh on 2.1.9 on Ubuntu 14.04

:: ### ajay@comp:~$ sudo netstat -apn | grep 9042 [sudo] password for admin: tcp6 0 0 127.0.0.1:9042 :::* LISTEN 10169/java

Re: Not able to cqlsh on 2.1.9 on Ubuntu 14.04

list of addresses. # Ex: ",," - seeds: "our.ip.address.here" Following is the netstat output :: #### ajay@comp:~$ sudo netstat -

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 wrote: > Hi Jared. > > Thanks for your help. > > I made the config-changes. > Also, I changed the seed (right now, we are just

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

requires a dedicated step. So, if the schema has 100 "tables", we would need 100 steps. Is it so? If yes, can the entire data be dumped/restored in one go? Just asking, to save time, if it could :) Thanks and Regards, Ajay

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 loca

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

Thanks Mam for the reply. I guess there is manual work needed to bring all the SSTables files into one directory, so doesn't really solve the purpose I guess. So, going the "vanilla" way might be simpler :) Thanks anyways for the help !!! Thanks and Regards, Ajay On Tue, Sep 15

Re: Getting intermittent errors while taking snapshot

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

Is replication possible with already existing data?

robust)? Brief pointers to above will give huge confidence-boosts in our endeavours. Thanks and Regards, Ajay

Re: Is replication possible with already existing data?

tion_factor of 3. b) (As advised by you) Duplicating the already-existing-data on the other 2 nodes. c) Thereafter, let Cassandra create a total of 3 copies for every row of new-incoming-data. Once again, thanks a ton for the help !! Thanks and Regards, Ajay > You shouldn't need down

Re: Is replication possible with already existing data?

m beginning to think that a 2*2 (2 nodes each at 2 data-centres) will be the ideal setup (allowing failures of entire site, or a few nodes on the same site). I am sorry for asking such newbie questions, and I will be grateful if these silly questions could be answered by the experts :) Thanks and Regards, Ajay

Re: Is replication possible with already existing data?

On Thu, Oct 8, 2015 at 9:47 AM, Ajay Garg wrote: > Thanks Eric for the reply. > > > On Thu, Oct 8, 2015 at 1:44 AM, Eric Stevens wrote: >> If you're at 1 node (N=1) and RF=1 now, and you want to go N=3 RF=3, you >> ought to be able to increase RF to 3 before bootstra

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 wrote: > Hi Ajay, > > > On Fri, Oct 9, 2015 at 9:00 AM, Ajay Garg wrote: >> > In this case, it will be the responsibility of APP1 to start connection to > CAS12. On the other hand if yo

Re: Is replication possible with already existing data?

cassandra-2.1.10.jar:2.1.10] at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_60] Ideas? Thanks and Regards, Ajay On Mon, Oct 12, 2015 at 3:46 PM, Carlos Alonso wrote: > Yes Ajay, in your particular scenar

Re: Is replication possible with already existing data?

ression: all 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 wrote: > On 10/22/2015 10:

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 wrote: > Hi Michael. > > Please find below the contents of cassandra.yaml for CAS11 (the files on > the rest of the three nodes are also

Re: Is replication possible with already existing data?

l the help guys !!! Thanks and Regards, Ajay On Sat, Oct 24, 2015 at 2:06 AM, Steve Robenalt wrote: > Hi Ajay, > > Please take a look at the cassandra.yaml configuration reference regarding > intial_token and num_tokens: > > > http://docs.datastax.com/en/cassan

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

ommunicate over public IP-Addresses with these nodes). Are any further optimizations possible, in the sense that specifying private-IP-Addresses would work? I ask this, because we need to minimize network-latency, so possibility of private-IP-addresses will help in this regard. Thanks and Regards, Ajay

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?

s and Regards, Ajay On Sat, Oct 24, 2015 at 4:14 PM, Vasileios Vlachos < vasileiosvlac...@gmail.com> wrote: > Hello Ajay, > > Have a look in the *max_hint_window_in_ms* : > > > http://docs.datastax.com/en/cassandra/2.0/cassandra/configuration/configCassandra_yaml_r.html >

Re: Is replication possible with already existing data?

rs. Ultimately, it is the Java-driver that will be used in production, so it is imperative that data-persistence/replication happens for any downing of any permutation of node(s). Thanks and Regards, Ajay

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

If that is the case, I think we are good. Thanks and Regards, Ajay On Sat, Oct 24, 2015 at 6:03 PM, Vasileios Vlachos < vasileiosvlac...@gmail.com> wrote: > Hello Ajay, > > Here is a good link: > > http://docs.datastax.com/en/cassandra/2.1/cassandra/operations/opsRepairNod

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 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 brought up. > Syncing alw

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

Never mind Vasileios, you have been a great help !! Thanks a ton again !!! Thanks and Regards, Ajay On Sat, Oct 24, 2015 at 10:17 PM, Vasileios Vlachos < vasileiosvlac...@gmail.com> wrote: > I am not sure I fully understand the question, because nodetool repair is > one of the th

Re: Is replication possible with already existing data?

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 wrote: > Ideas please, on what I may be doing wrong? > > On Sat, Oct 24, 2015 at 5:48 PM, Ajay Garg wrote: &g

Re: Is replication possible with already existing data?

Bingo !!! Using "LoadBalancingPolicy" did the trick. Exactly what was needed !!! Thanks and Regards, Ajay On Sun, Oct 25, 2015 at 5:52 PM, Ryan Svihla wrote: > Ajay, > > So It's the default driver behavior to pin requests to the first data > center it connects to

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

y 0 acknowledged the write)* Am I missing something? -- Regards, Ajay

Doubt regarding consistency-level in Cassandra-2.1.10

"write-options with LOCAL_QUORUM consistency-level" in all create/save statements, but I still get this error. Does something else need to be changed in /etc/cassandra/cassandra.yaml too? Or may be some another place? -- Regards, Ajay

Re: Doubt regarding consistency-level in Cassandra-2.1.10

consistency. > > 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 wrote: > >> Hi All. >> >> I have a 2*2 Network-Topology Replication setup, and I run my application >> via DataStax-drive

Re: Doubt regarding consistency-level in Cassandra-2.1.10

node timeouts . > > On Mon, Nov 2, 2015 at 8:01 PM, Ajay Garg wrote: > >> Hi Eric, >> >> I am sorry, but I don't understand. >> >> If there had been some issue in the configuration, then the >> consistency-issue would be seen everytime (I guess). >

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 wrote: > Hmm... ok. > > Ideally, we require :: > > a) > The intra-DC-node

Basic query in setting up secure inter-dc cluster

2 and restart it, will the traffic between DC1M1/DC1M2 and DC2M2 be secure? Or security will kick in ONLY AFTER the changes are made in all the 4 machines? Asking here, because I don't want to screw up a live cluster due to my lack of experience. Looking forward to some pointers. -- Regards, Ajay

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

ed on node2* in cassandra.yaml. if it is, secure-communication is allowed. Is my thinking right? I On Wed, Jan 6, 2016 at 1:55 PM, Neha Dave wrote: > Hi Ajay, > Have a look here : > https://docs.datastax.com/en/cassandra/1.2/cassandra/security/secureSSLNodeToNode_t.html > >

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

quot;. Thanks and Regards, Ajay On Wed, Jan 6, 2016 at 4:16 PM, Ajay Garg 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 to how node-to-node > encryptio

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 va

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

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 wrote: > Hi All. > > A gentle

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 wrote: > Ok, trying to wake up this thread again. > > I went through the following link

New to cassandra

Hi I am a php developer, I am new to cassandra. Is there any starting guide or tutorial from where i can begin Thanks Ajay

  1   2   >