RE: Periodic Anti-Entropy repair

2015-05-24 Thread Tiwari, Tarun 
We have encountered issues of very long running nodetool repair when we ran it 
node by node on really large dataset. It even kept on running for a week in 
some cases.
IMO the strategy you are choosing of repairing nodes by –st and –et is good one 
and does the same work in small increments logs of which can be analyzed easily.

In addition my suggestion would be to use –h option to connect to the node from 
outside, and take care of the fact that node tool ring will give even –ve token 
ranges in the ‘for’ loop. You can go from -2^63 to first ring value, then from 
(there+1) to next token value. Better not use i+=2 because token values are not 
necessarily even numbers.

Regards,
Tarun

From: Anuj Wadehra [mailto:anujw_2...@yahoo.co.in]
Sent: Sunday, May 24, 2015 6:31 AM
To: user@cassandra.apache.org
Subject: Re: Periodic Anti-Entropy repair

You should use nodetool repair -pr on every node to make sure that each range 
is repaired only once.


Thanks
Anuj Wadehra

Sent from Yahoo Mail on 
Androidhttps://overview.mail.yahoo.com/mobile/?.src=Android


From:Brice Argenson bargen...@gmail.commailto:bargen...@gmail.com
Date:Sat, 23 May, 2015 at 12:31 am
Subject:Periodic Anti-Entropy repair
Hi everyone,

We are currently migrating from DSE to Apache Cassandra and we would like to 
put in place an automatic and periodic nodetool repair execution to replace the 
one executed by OpsCenter.

I wanted to create a script / service that would run something like that:

token_rings = `nodetool ring | awk '{print $8}’`
for(int i = 0; i  token_rings.length; i += 2) {
   `nodetool repair -st token_rings[i] -et token_rings[i+1]`
}

That script / service would run every week (our GCGrace is 10 days) and would 
repair all the ranges of the ring one by one.

I also looked a bit on Google and I found that script: 
https://github.com/BrianGallew/cassandra_range_repair
It seems to do something equivalent but it also seems to run the repair node by 
node instead of the complete ring.
From my understanding, that would mean that the script has to be run for every 
node of the cluster and that all token ranges would be repair as many time as 
the number of replicas containing it.


Is there something I misunderstand?
Which approach is better?
How do you handle your Periodic Anti-Entropy Repairs?


Thanks a lot!

Cluster imbalance caused due to #Num_Tokens

2015-04-21 Thread Tiwari, Tarun 
Hi,

While setting up a cluster for our POC, when we installed Cassandra on the 1st 
node we gave num_tokens: 256 , while on next 2 nodes which were added later we 
left it blank in Cassandra.yaml.

This made our cluster an unbalanced one with nodetool status showing 99% load 
on one server. Now even if I am setting up num tokens in the other 2 nodes as 
256, its not seeming to effect. The wiki article  
http://wiki.apache.org/cassandra/VirtualNodes/Balance doesn't seem to provide 
steps to correct from this situation.

I read that there was nodetool balance kind of command in Cassandra 0.7 but not 
anymore.

UN  Node3  23.72 MB   1   0.4%   41a71df-7e6c-40ab-902f-237697eaaf3e  rack1
UN  Node2  79.35 MB   1   0.5%   98c493b-f661-491e-9d1f-1803f859528b  rack1
UN  Node1  86.93 MB   256 99.1%  a35ccca-556c-4f77-aa6d-7e3dad41ecf8  rack1

Is there something that we can do now balance the cluster?

Regards,
Tarun

RE: Can cqlsh COPY command be run through

2015-04-07 Thread Tiwari, Tarun 
Thanks.

That was kind of a logical guess is was having on it. Thanks for confirming.



From: DuyHai Doan [mailto:doanduy...@gmail.com]
Sent: Wednesday, April 08, 2015 1:05 AM
To: user@cassandra.apache.org
Subject: Re: Can cqlsh COPY command be run through

Short answer is no.

Whenever you access the session object of the Java driver directly (using 
withSessionDo{...}), you bypass the data locality optimisation made by the 
connector



On Sun, Apr 5, 2015 at 9:53 AM, Tiwari, Tarun 
tarun.tiw...@kronos.commailto:tarun.tiw...@kronos.com wrote:
Hi,

I am looking for, if the CQLSH COPY command be run using the spark scala 
program. Does it benefit from the parallelism achieved by spark.
I am doing something like below:

val conf = new SparkConf(true).setMaster(spark://Master-Host:7077) 
.setAppName(Load Cs Table using COPY TO)
lazy val sc = new SparkContext(conf)

import com.datastax.spark.connector.cql.CassandraConnector

CassandraConnector(conf).withSessionDo { session =
session.execute(truncate wfcdb.test_wfctotal;)
session.execute(COPY wfcdb.test_wfctotal 
(wfctotalid, timesheetitemid, employeeid, durationsecsqty, wageamt, moneyamt, 
applydtm, laboracctid, paycodeid, startdtm, stimezoneid, adjstartdtm, 
adjapplydtm, enddtm, homeaccountsw, notpaidsw, wfcjoborgid, unapprovedsw, 
durationdaysqty, updatedtm, totaledversion, acctapprovalnum) FROM 
'/home/analytics/Documents/wfctotal.dat' WITH DELIMITER = '|' AND HEADER = 
true;)

Regards,
Tarun Tiwari | Workforce Analytics-ETL | Kronos India
M: +91 9540 28 27 77 | Tel: +91 120 4015200tel:%2B91%20120%204015200
Kronos | Time  Attendance • Scheduling • Absence Management • HR  Payroll • 
Hiring • Labor Analytics
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Can cqlsh COPY command be run through

2015-04-05 Thread Tiwari, Tarun 
Hi,

I am looking for, if the CQLSH COPY command be run using the spark scala 
program. Does it benefit from the parallelism achieved by spark.
I am doing something like below:

val conf = new SparkConf(true).setMaster(spark://Master-Host:7077) 
.setAppName(Load Cs Table using COPY TO)
lazy val sc = new SparkContext(conf)

import com.datastax.spark.connector.cql.CassandraConnector

CassandraConnector(conf).withSessionDo { session =
session.execute(truncate wfcdb.test_wfctotal;)
session.execute(COPY wfcdb.test_wfctotal 
(wfctotalid, timesheetitemid, employeeid, durationsecsqty, wageamt, moneyamt, 
applydtm, laboracctid, paycodeid, startdtm, stimezoneid, adjstartdtm, 
adjapplydtm, enddtm, homeaccountsw, notpaidsw, wfcjoborgid, unapprovedsw, 
durationdaysqty, updatedtm, totaledversion, acctapprovalnum) FROM 
'/home/analytics/Documents/wfctotal.dat' WITH DELIMITER = '|' AND HEADER = 
true;)

Regards,
Tarun Tiwari | Workforce Analytics-ETL | Kronos India
M: +91 9540 28 27 77 | Tel: +91 120 4015200
Kronos | Time  Attendance * Scheduling * Absence Management * HR  Payroll * 
Hiring * Labor Analytics
Join Kronos on: kronos.comhttp://www.kronos.com/ | 
Facebookhttp://www.kronos.com/facebook | 
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RE: Getting NoClassDefFoundError for com/datastax/spark/connector/mapper/ColumnMapper

2015-04-03 Thread Tiwari, Tarun 
Yes it seems it was not taking the classpath for the Cassandra connector. Added 
it to driver class path argument but got into another error

Used below command now

spark-submit --class ldCassandraTable 
./target/scala-2.10/merlin-spark-cassandra-poc_2.10-0.0.1.jar 
/home/analytics/Documents/test_wfctotal.dat test_wfctotal --driver-class-path 
/home/analytics/Installers/spark-cassandra-connector-1.1.1/spark-cassandra-connector/target/scala-2.10/spark-cassandra-connector-assembly-1.1.1.jar

and getting new error

Spark assembly has been built with Hive, including Datanucleus jars on classpath
15/04/03 13:46:44 WARN NativeCodeLoader: Unable to load native-hadoop library 
for your platform... using builtin-java classes where applicable
:/home/analytics/Installers/spark-cassandra-connector-1.1.1/spark-cassandra-connector/target/scala-2.10/spark-cassandra-connector-assembly-1.1.1.jar:/home/analytics/Installers/spark-1.1.1/conf:/home/analytics/Installers/spark-1.1.1/assembly/target/scala-2.10/spark-assembly-1.1.1-hadoop1.0.4.jar:/home/analytics/Installers/spark-1.1.1/lib_managed/jars/datanucleus-rdbms-3.2.1.jar:/home/analytics/Installers/spark-1.1.1/lib_managed/jars/datanucleus-core-3.2.2.jar:/home/analytics/Installers/spark-1.1.1/lib_managed/jars/datanucleus-api-jdo-3.2.1.jar
15/04/03 13:46:46 WARN LoadSnappy: Snappy native library not loaded
Records Loaded to
15/04/03 13:46:54 ERROR ConnectionManager: Corresponding SendingConnection to 
ConnectionManagerId(NODE02.int.kronos.com,60755) not found



From: Dave Brosius [mailto:dbros...@mebigfatguy.com]
Sent: Friday, April 03, 2015 9:15 AM
To: user@cassandra.apache.org
Subject: Re: Getting NoClassDefFoundError for 
com/datastax/spark/connector/mapper/ColumnMapper

This is what i meant by 'initial cause'

Caused by: java.lang.ClassNotFoundException: 
com.datastax.spark.connector.mapper.ColumnMapper

So it is in fact a classpath problem

Here is the class in question 
https://github.com/datastax/spark-cassandra-connector/blob/master/spark-cassandra-connector/src/main/scala/com/datastax/spark/connector/mapper/ColumnMapper.scala

Maybe it would be worthwhile to put this at the top of your main method

System.out.println(System.getProperty( java.class.path);

and show what that prints.

What version of the cassandra and what version of the cassandra-spark connector 
are you using, btw?




On 04/02/2015 11:16 PM, Tiwari, Tarun wrote:
Sorry I was unable to reply for couple of days.
I checked the error again and can’t see any other initial cause. Here is the 
full error that is coming.

Exception in thread main java.lang.NoClassDefFoundError: 
com/datastax/spark/connector/mapper/ColumnMapper
at ldCassandraTable.main(ld_Cassandra_tbl_Job.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.spark.deploy.SparkSubmit$.launch(SparkSubmit.scala:329)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:75)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: java.lang.ClassNotFoundException: 
com.datastax.spark.connector.mapper.ColumnMapper
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)



From: Dave Brosius [mailto:dbros...@mebigfatguy.com]
Sent: Tuesday, March 31, 2015 8:46 PM
To: user@cassandra.apache.orgmailto:user@cassandra.apache.org
Subject: Re: Getting NoClassDefFoundError for 
com/datastax/spark/connector/mapper/ColumnMapper




Is there an 'initial cause' listed under that exception you gave? As 
NoClassDefFoundError is not exactly the same as ClassNotFoundException. It 
meant that ColumnMapper couldn't initialize it's static initializer, it could 
be because some other class couldn't be found, or it could be some other non 
classloader related error.



On 2015-03-31 10:42, Tiwari, Tarun wrote:
Hi Experts,

I am getting java.lang.NoClassDefFoundError: 
com/datastax/spark/connector/mapper/ColumnMapper while running a app to load 
data to Cassandra table using the datastax spark connector

Is there something else I need to import in the program or dependencies?

RUNTIME ERROR:  Exception in thread main java.lang.NoClassDefFoundError: 
com/datastax/spark/connector/mapper/ColumnMapper
at ldCassandraTable.main(ld_Cassandra_tbl_Job.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

Below is my scala program

/*** ld_Cassandra_Table.scala ***/
import

RE: Getting NoClassDefFoundError for com/datastax/spark/connector/mapper/ColumnMapper

2015-04-02 Thread Tiwari, Tarun 
Sorry I was unable to reply for couple of days.
I checked the error again and can’t see any other initial cause. Here is the 
full error that is coming.

Exception in thread main java.lang.NoClassDefFoundError: 
com/datastax/spark/connector/mapper/ColumnMapper
at ldCassandraTable.main(ld_Cassandra_tbl_Job.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.spark.deploy.SparkSubmit$.launch(SparkSubmit.scala:329)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:75)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: java.lang.ClassNotFoundException: 
com.datastax.spark.connector.mapper.ColumnMapper
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)



From: Dave Brosius [mailto:dbros...@mebigfatguy.com]
Sent: Tuesday, March 31, 2015 8:46 PM
To: user@cassandra.apache.org
Subject: Re: Getting NoClassDefFoundError for 
com/datastax/spark/connector/mapper/ColumnMapper




Is there an 'initial cause' listed under that exception you gave? As 
NoClassDefFoundError is not exactly the same as ClassNotFoundException. It 
meant that ColumnMapper couldn't initialize it's static initializer, it could 
be because some other class couldn't be found, or it could be some other non 
classloader related error.



On 2015-03-31 10:42, Tiwari, Tarun wrote:
Hi Experts,

I am getting java.lang.NoClassDefFoundError: 
com/datastax/spark/connector/mapper/ColumnMapper while running a app to load 
data to Cassandra table using the datastax spark connector

Is there something else I need to import in the program or dependencies?

RUNTIME ERROR:  Exception in thread main java.lang.NoClassDefFoundError: 
com/datastax/spark/connector/mapper/ColumnMapper
at ldCassandraTable.main(ld_Cassandra_tbl_Job.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

Below is my scala program

/*** ld_Cassandra_Table.scala ***/
import org.apache.spark.SparkContext
import org.apache.spark.SparkContext._
import org.apache.spark.SparkConf
import com.datastax.spark.connector
import com.datastax.spark.connector._

object ldCassandraTable {
def main(args: Array[String]) {
  val fileName = args(0)
  val tblName = args(1)
  val conf = new SparkConf(true).set(spark.cassandra.connection.host, 
MASTER HOST) .setMaster(MASTER URL) .setAppName(LoadCassandraTableApp)
  val sc = new SparkContext(conf)
  
sc.addJar(/home/analytics/Installers/spark-cassandra-connector-1.1.1/spark-cassandra-connector/target/scala-2.10/spark-cassandra-connector-assembly-1.1.1.jar)
  val normalfill = sc.textFile(fileName).map(line = line.split('|'))
  normalfill.map(line = (line(0), line(1), line(2), line(3), line(4), line(5), 
line(6), line(7), line(8), line(9), line(10), line(11), line(12), line(13), 
line(14), line(15), line(16), line(17), line(18), line(19), line(20), 
line(21))).saveToCassandra(keyspace, tblName, SomeColumns(wfctotalid, 
timesheetitemid, employeeid, durationsecsqty, wageamt, moneyamt, 
applydtm, laboracctid, paycodeid, startdtm, stimezoneid, 
adjstartdtm, adjapplydtm, enddtm, homeaccountsw, notpaidsw, 
wfcjoborgid, unapprovedsw, durationdaysqty, updatedtm, 
totaledversion, acctapprovalnum))
  println(Records Loaded to .format(tblName))
  Thread.sleep(500)
  sc.stop()
}
}

Below is the sbt file:

name:= “POC”
version := 0.0.1

scalaVersion := 2.10.4

// additional libraries
libraryDependencies ++= Seq(
  org.apache.spark %% spark-core % 1.1.1 % provided,
  org.apache.spark %% spark-sql % 1.1.1 % provided,
  com.datastax.spark %% spark-cassandra-connector % 1.1.1 % provided
)

Regards,
Tarun Tiwari | Workforce Analytics-ETL | Kronos India
M: +91 9540 28 27 77 | Tel: +91 120 4015200
Kronos | Time  Attendance • Scheduling • Absence Management • HR  Payroll • 
Hiring • Labor Analytics
Join Kronos on: kronos.comhttp://www.kronos.com/ | 
Facebookhttp://www.kronos.com/facebook|Twitterhttp://www.kronos.com/twitter|LinkedInhttp://www.kronos.com/linkedin
 |YouTubehttp://www.kronos.com/youtube

Getting NoClassDefFoundError for com/datastax/spark/connector/mapper/ColumnMapper

2015-03-31 Thread Tiwari, Tarun 
Hi Experts,

I am getting java.lang.NoClassDefFoundError: 
com/datastax/spark/connector/mapper/ColumnMapper while running a app to load 
data to Cassandra table using the datastax spark connector

Is there something else I need to import in the program or dependencies?

RUNTIME ERROR:  Exception in thread main java.lang.NoClassDefFoundError: 
com/datastax/spark/connector/mapper/ColumnMapper
at ldCassandraTable.main(ld_Cassandra_tbl_Job.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

Below is my scala program

/*** ld_Cassandra_Table.scala ***/
import org.apache.spark.SparkContext
import org.apache.spark.SparkContext._
import org.apache.spark.SparkConf
import com.datastax.spark.connector
import com.datastax.spark.connector._

object ldCassandraTable {
def main(args: Array[String]) {
  val fileName = args(0)
  val tblName = args(1)
  val conf = new SparkConf(true).set(spark.cassandra.connection.host, 
MASTER HOST) .setMaster(MASTER URL) .setAppName(LoadCassandraTableApp)
  val sc = new SparkContext(conf)
  
sc.addJar(/home/analytics/Installers/spark-cassandra-connector-1.1.1/spark-cassandra-connector/target/scala-2.10/spark-cassandra-connector-assembly-1.1.1.jar)
  val normalfill = sc.textFile(fileName).map(line = line.split('|'))
  normalfill.map(line = (line(0), line(1), line(2), line(3), line(4), line(5), 
line(6), line(7), line(8), line(9), line(10), line(11), line(12), line(13), 
line(14), line(15), line(16), line(17), line(18), line(19), line(20), 
line(21))).saveToCassandra(keyspace, tblName, SomeColumns(wfctotalid, 
timesheetitemid, employeeid, durationsecsqty, wageamt, moneyamt, 
applydtm, laboracctid, paycodeid, startdtm, stimezoneid, 
adjstartdtm, adjapplydtm, enddtm, homeaccountsw, notpaidsw, 
wfcjoborgid, unapprovedsw, durationdaysqty, updatedtm, 
totaledversion, acctapprovalnum))
  println(Records Loaded to .format(tblName))
  Thread.sleep(500)
  sc.stop()
}
}

Below is the sbt file:

name:= POC
version := 0.0.1

scalaVersion := 2.10.4

// additional libraries
libraryDependencies ++= Seq(
  org.apache.spark %% spark-core % 1.1.1 % provided,
  org.apache.spark %% spark-sql % 1.1.1 % provided,
  com.datastax.spark %% spark-cassandra-connector % 1.1.1 % provided
)

Regards,
Tarun Tiwari | Workforce Analytics-ETL | Kronos India
M: +91 9540 28 27 77 | Tel: +91 120 4015200
Kronos | Time  Attendance * Scheduling * Absence Management * HR  Payroll * 
Hiring * Labor Analytics
Join Kronos on: kronos.comhttp://www.kronos.com/ | 
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Way to Cassandra File System

2015-03-24 Thread Tiwari, Tarun 
Hi All,

In DSE they claim to have Cassandra File System in place of Hadoop which makes 
it real fault tolerant.
Is there a way to use Cassandra file system CFS in place of HDFS if I don't 
have DSE?

Regards,
Tarun Tiwari | Workforce Analytics-ETL | Kronos India
M: +91 9540 28 27 77 | Tel: +91 120 4015200
Kronos | Time  Attendance * Scheduling * Absence Management * HR  Payroll * 
Hiring * Labor Analytics
Join Kronos on: kronos.comhttp://www.kronos.com/ | 
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RE: Way to Cassandra File System

2015-03-24 Thread Tiwari, Tarun 
Cool I think that helps.

Regards
Tarun

From: Jonathan Lacefield [mailto:jlacefi...@datastax.com]
Sent: Tuesday, March 24, 2015 6:39 PM
To: user@cassandra.apache.org
Subject: Re: Way to Cassandra File System

Hello,
  CFS is a DataStax proprietary implementation of the Hadoop File System 
interface/abstract base class, sorry don't remember which of the top of my 
head.  You could create your own implementation if you do not want to use 
DataStax's CFS.  Or you could purchase DataStax Enterprise.
  Hope this provides clarity for you.
Thanks,
Jonathan


[datastax_logo.png]

Jonathan Lacefield

Director - Consulting, Americas | (404) 822 3487 | 
jlacefi...@datastax.commailto:jlacefi...@datastax.com


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On Tue, Mar 24, 2015 at 9:01 AM, Tiwari, Tarun 
tarun.tiw...@kronos.commailto:tarun.tiw...@kronos.com wrote:
Hi All,

In DSE they claim to have Cassandra File System in place of Hadoop which makes 
it real fault tolerant.
Is there a way to use Cassandra file system CFS in place of HDFS if I don’t 
have DSE?

Regards,
Tarun Tiwari | Workforce Analytics-ETL | Kronos India
M: +91 9540 28 27 77 | Tel: +91 120 4015200tel:%2B91%20120%204015200
Kronos | Time  Attendance • Scheduling • Absence Management • HR  Payroll • 
Hiring • Labor Analytics
Join Kronos on: kronos.comhttp://www.kronos.com/ | 
Facebookhttp://www.kronos.com/facebook | 
Twitterhttp://www.kronos.com/twitter | 
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