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Thanks & Regards Amit Singh

Migrating to LCS : Disk Size recommendation clashes

Hi All, We are in process of migrating from STCS to LCS and was just doing few reads on line . Below is the excerpt from Datastax recommendation on data size : Doc link : https://docs.datastax.com/en/landing_page/doc/landing_page/planning/planningHardware.html [cid:image004.png@01D2B47E.E29E7

RE: Incremental Repair Migration

Your best bet is to just run repair constantly. We maintain an updated fork of Spotify's reaper tool to help manage it: https://github.com/thelastpickle/cassandra-reaper On Mon, Jan 9, 2017 at 10:04 PM Amit Singh F mailto:amit.f.si...@ericsson.com>> wrote: Hi All, We are thinking o

Incremental Repair Migration

Hi All, We are thinking of migrating from primary range repair (-pr) to incremental repair. Environment : * Cassandra 2.1.16 * 25 Node cluster , * RF 3 * Data size up to 450 GB per nodes We found that running full repair will be taking around 8 hrs per node which means 20

RE: Incremental repair for the first time

Hi , Generally Upgradesstables are only recommended when you plan to move with Major version like from 2.0 to 2.1 or from 2.1 to 2.2 etc. Since you are doing minor version upgrade no need to run upgradesstables utility. Link by Datastax might be helpful to you : https://support.datastax.com/

RE: Trying to find cause of exception

0.jar:3.3.0] at java.lang.Thread.run(Thread.java:745) [na:1.8.0_111] Caused by: java.lang.NullPointerException: null RICHARD NEY TECHNICAL DIRECTOR, RESEARCH & DEVELOPMENT +1 (978) 848.6640 WORK +1 (916) 846.2353 MOBILE UNITED STATES richard....@aspect.com<mailto:richard@aspect.com> asp

RE: Trying to find cause of exception

Hello, Few pointers : a.) Can you check in system.log for similar msgs like “marking as down” on the node which gives err msg if yes, then please check for GC pause . Heavy load is one of the reason for this. b.)Can you try connecting cqlsh to that node once you get this kind of msg

RE: Handling Leap second delay

Hi , Attached conversation can be of some help to you. Regards Amit Singh From: Sanjeev T [mailto:san...@gmail.com] Sent: Wednesday, December 21, 2016 9:24 AM To: user@cassandra.apache.org Subject: Handling Leap second delay Hi, Can some of you share points on, the versions and handling leap s

JConsole Support for SSL in C* 2.0

Hi All, I was looking through the documentation of Security in C* 2.0, I noticed that there is no such mention of Jconsole over SSL whereas in latest 3.x doc, I can spot that : http://docs.datastax.com/en/cassandra_win/3.0/cassandra/configuration/secureJconsoleSSL.html so what I can infer from

RE: C* files getting stuck

Hi All, Please check if anybody has faced below issue and if yes what best can be done to avoid this.? Thanks in advance. Regards Amit Singh From: Amit Singh F [mailto:amit.f.si...@ericsson.com] Sent: Wednesday, June 29, 2016 3:52 PM To: user@cassandra.apache.org<mailto:u

upgradesstables throws error when migrating from 2.0.14 to 2.1.13

Hi All, We are in process of migrating from 2.0.14 to 2.1.13 and we are able to successfully install binaries and make Cassandra 2.1.13 running up and fine. But issue comes up when we try to run nodetool upgradesstables , it gets finished in few seconds only which means it does not find any old

RE: Exclude a host from the repair process

Hi Jean, This option is available in C* version 2.1.x & above, where you can specify hosts in nodetool repair command . For more detail please visit the link below : https://docs.datastax.com/en/cassandra/2.1/cassandra/tools/toolsRepair.html Regards Amit Singh From: Alain RODRIGUEZ [mailto:a

RE: C* files getting stuck

instance has been our fix so far. I am very interested if anyone else has a solution. I was unable to get a definitive answer from Datastax during the last Cassandra Summit. From: Amit Singh F [mailto:amit.f.si...@ericsson.com] Sent: Thursday, June 30, 2016 7:02 AM To: user@cassandra.apache.org

RE: C* files getting stuck

Hi All, Please check fi anybody has faced below issue and if yes what best can be done to avoid this.? Thanks in advance. Regards Amit Singh From: Amit Singh F [mailto:amit.f.si...@ericsson.com] Sent: Wednesday, June 29, 2016 3:52 PM To: user@cassandra.apache.org Subject: C* files getting

C* files getting stuck

Hi All We are running Cassandra 2.0.14 and disk usage is very high. On investigating it further we found that there are around 4-5 files(~ 150 GB) in stuck mode. Command Fired : lsof /var/lib/cassandra | grep -i deleted Output : java 12158 cassandra 308r REG 8,16 34396638044 12727268 /var/lib

RE: *** How to bring up one of the Nodes which is down ***

Hi Lokesh, Please check your Cassandra logs for the downed too and see any exception traces are there or not. From: Carlos Alonso [mailto:i...@mrcalonso.com] Sent: Tuesday, April 12, 2016 3:59 PM To: user@cassandra.apache.org Subject: Re: *** How to bring up one of the Nodes which is down *** H

RE: Lot of GC on two nodes out of 7

Hi Anishek, We too faced similar problem in 2.0.14 and after doing some research we config few parameters in Cassandra.yaml and was able to overcome GC pauses . Those are : · memtable_flush_writers : increased from 1 to 3 as from tpstats output we can see mutations dropped so it mean

RE: Lot of GC on two nodes out of 7

Hi Anishek, We too faced similar problem in 2.0.14 and after doing some research we config few parameters in Cassandra.yaml and was able to overcome GC pauses . Those are : · memtable_flush_writers : increased from 1 to 3 as from tpstats output we can see mutations dropped so it mean

RE: Querying on index

Hi Rakesh, Default consistency level of client is set to 1, from your query it seems you are using CQL so could you try same query by setting CONSISTENCY ALL when you enter cqlsh. Regards Amit Singh From: Rakesh Kumar [mailto:dcrunch...@aim.com] Sent: Wednesday, March 02, 2016 3:25 AM To: u

RE: Gossip Protocol

Hello, To get detailed description/Architecture of Gossip protocol please check the below link : https://wiki.apache.org/cassandra/ArchitectureGossip Also you can try nodetool gossipinfo command , output of this will guide you on details saved by gossip. Regards Amit Singh From: Thouraya TH

Upgrade from 2.0.x to 2.2.x documentation missing

Hi, We are currently at Cassandra 2.0.14 in production and since it going to be EOL soon so we are planning to upgrade it to Cassandra 2.2.4 (http://cassandra.apache.org/download/) which is the currently production ready version. While doing some analysis we found that there is no such entry of

unit test failing when pull is taken

Hi All, I have taken pull from Cassandra branch and when I try to run test cases , they start failing(around 13 test suites are failing). Below are some traces of some test suite which are failing : * [junit] Testsuite: org.apache.cassandra.db.compaction.BlacklistingCompactionsTest