Cassandra OS Patching.

Hi Team, What is the best way to patch OS of 1000 nodes Multi DC Cassandra cluster where we cannot suspend application traffic( we can redirect traffic to one DC). Please suggest if anyone has any best practice around it. -- *C*heers,* *Anshu V*

Refresh from Prod to Dev

Team , I want to validate and POC on production data. Data on production is huge. What could be optimal method to move the data from Prod to Dev environment? I know there are few solutions but what/which is most efficient method do refresh for dev env? -- *C*heers,* *Anshu V*

Re: Upgrade using rebuild

supported between versions, although on 3.x it > might work. > > > On Dec 14, 2017, at 11:01 AM, Jon Haddad <j...@jonhaddad.com> wrote: > > no > > On Dec 14, 2017, at 10:59 AM, Anshu Vajpayee <anshu.vajpa...@gmail.com> > wrote: > > Thanks! I am aware

Re: Upgrade using rebuild

work. > > > On Dec 14, 2017, at 11:01 AM, Jon Haddad <j...@jonhaddad.com> wrote: > > no > > On Dec 14, 2017, at 10:59 AM, Anshu Vajpayee <anshu.vajpa...@gmail.com> > wrote: > > Thanks! I am aware with these steps. > > I m just thinking , is it possi

Re: Upgrade using rebuild

-> 3.0.x but not 1.2 to 3.11 > > Cheers, > Hannu > > On 14 December 2017 at 12:33:49, Anshu Vajpayee (anshu.vajpa...@gmail.com) > wrote: > > Hi - > > Is it possible to upgrade a cluster ( DC wise) using nodetool rebuild ? > > > > -- > *C*heers,* > *Anshu V* > > > -- *C*heers,* *Anshu V*

Upgrade using rebuild

Hi - Is it possible to upgrade a cluster ( DC wise) using nodetool rebuild ? -- *C*heers,* *Anshu V*

Re: nodetool rebuild data size

You will require to rebuild each node with nodetool rebuild command. it would be 60TB. On Thu, Dec 14, 2017 at 11:35 AM, Peng Xiao <2535...@qq.com> wrote: > Hi there, > > if we have a Cassandra DC1 with data size 60T,RF=3,then we rebuild a new > DC2(RF=3),how much data will stream to DC2?20T

Re: How quickly we can bootstrap

t. You can find more detail > here if interested: https://www.instaclustr.com/instaclustr- > dynamic-resizing-for-apache-cassandra/ > > Cheers > Ben > > On Sat, 18 Nov 2017 at 05:02 Anshu Vajpayee <anshu.vajpa...@gmail.com> > wrote: > >> Cassandra supports elast

How quickly we can bootstrap

Cassandra supports elastic scalability - meaning on demand we can increase or decrease #of nodes as per scaling demand from the application. Let's consider we have 5 node cluster and each node has data pressure of about 3 TB. Now as per sudden load, we want to add 1 node in the cluster as

Re: Reaper 1.0

. > On Thu, Nov 16, 2017 at 11:57 PM Anshu Vajpayee <anshu.vajpa...@gmail.com> > wrote: > >> Thanks John for your efforts and nicley putting it on website & youtube . >> >> Just quick question - Is it compactiable with DSE versions? I know >> under the ho

Re: Reaper 1.0

Thanks John for your efforts and nicley putting it on website & youtube . Just quick question - Is it compactiable with DSE versions? I know under the hood they have cassandra only , but just wanted to listen your thoughts. On Thu, Nov 16, 2017 at 1:23 AM, Jon Haddad

Re: Node Failure Scenario

Thank you Jonathan and all. On Tue, Nov 14, 2017 at 10:53 PM, Jonathan Haddad <j...@jonhaddad.com> wrote: > Anthony’s suggestions using replace_address_first_boot lets you avoid that > requirement, and it’s specifically why it was added in 2.2. > On Tue, Nov 14, 2017 at 1:02 AM

Re: Node Failure Scenario

d with its own IP address. Make sure you >> delete the contents of the following directories: >> - data/ >> - commitlog/ >> - saved_caches/ >> >> Forget rejoining with repair -- it will just cause more problems. Cheers! >> >> On Mon, Nov 13, 2017 at 2:54 P

Node Failure Scenario

Hi All , There was a node failure in one of production cluster due to disk failure. After h/w recovery that node is noew ready be part of cluster, but it doesn't has any data due to disk crash. I can think of following option : 1. replace the node with same. using replace_address 2. Set

Re: Best approach to prepare to shutdown a cassandra node

ontana.oscars...@ericsson.com >> >> <mailto:simon.fontana.oscars...@ericsson.com>> wrote: >> >> >> >> Looking at the code in trunk, the stopdemon command invokes the >> >> CassandraDaemon.stop() function which does a graceful shutdown by &g

Re: Best approach to prepare to shutdown a cassandra node

Why are you killing when we have nodetool stopdaemon ? On Fri, Oct 13, 2017 at 1:49 AM, Javier Canillas wrote: > That's what I thought. > > Thanks! > > 2017-10-12 14:26 GMT-03:00 Hannu Kröger : > >> Hi, >> >> Drain should be enough. It stops

Compaction through put and compaction tasks

Hello - Ihave very generic question regarding compaction. How does cassandra internally generate the number of comapction tasks? How does it get affected with compaction throughput ? If we increase the number of compaction throughput, will the per second compaction task increase for same

Restrict cassandra to number of cpus

Hi All - Is it possible to restrict cassandra with some limited number of cpus/cores on a given bix? There is one JVM parameter to do that but all thread pools dont respect that setting. -D cassandra.available_processors Is there any other way to achieve this ?

Re: Help

​Setup is not on cloud. We have few nodes in one DC(1) and same number of nodes in other DC(2). We have dedicated firewall in-front on nodes. Read and write happen with local quorum so those dont get affected but hints get accumulated from one DC to other DC for replications. Hints are also

Help

Gossip shows - all nodes are up. But when we perform writes , coordinator stores the hints. It means - coordinator was not able to deliver the writes to few nodes after meeting consistency requirements. The nodes for which writes were failing, are in different DC. Those nodes do not have any

RE: Growing Hints

Cassandra verison 2.1.13 On Jan 4, 2017 12:34 AM, <sean_r_dur...@homedepot.com> wrote: > Version number may help. > > > > Sean Durity > > > > *From:* Anshu Vajpayee [mailto:anshu.vajpa...@gmail.com] > *Sent:* Tuesday, January 03, 2017 10:09 AM > *To:* us

Re: Growing Hints

. Please let me know if you have any question. Thanks On Dec 29, 2016 10:06 AM, "Anshu Vajpayee" <anshu.vajpa...@gmail.com> wrote: > Hello All > We have one unusual issue on our cluster. We are seeing growing hints > table on node although all the nodes are up and comi

Growing Hints

Hello All We have one unusual issue on our cluster. We are seeing growing hints table on node although all the nodes are up and coming online with notetool status. I know Cassandra appends the hints in case if there is write timeout for other nodes. In our case all nodes are up and

Re: Partition size

. On 12 Sep 2016 9:50 p.m., "Jeff Jirsa" <jji...@apache.org> wrote: > On 2016-09-08 18:53 (-0700), Anshu Vajpayee <anshu.vajpa...@gmail.com> > wrote: > > Is there any way to get partition size for a partition key ? > > > > Anshu, > > The simple

Partition size

Is there any way to get partition size for a partition key ?

Re: Read timeouts on primary key queries

We have seen read time out issue in cassandra due to high droppable tombstone ratio for repository. Please check for high droppable tombstone ratio for your repo. On Mon, Sep 5, 2016 at 8:11 PM, Romain Hardouin wrote: > Yes dclocal_read_repair_chance will reduce the

Re: Why there is no native shutdown command in cassandra

gt; On Mon, Jun 13, 2016 at 2:19 PM, Anshu Vajpayee <anshu.vajpa...@gmail.com> > wrote: > >> I just tested. It doesn't flush memtables like nodetool drain/flush >> command. Means it only does crash for the node, no graceful shutdown. >> >> >> >> On Mo

Re: Why there is no native shutdown command in cassandra

2016 at 1:11 PM, Anshu Vajpayee <anshu.vajpa...@gmail.com> > wrote: > >> Thanks for information. >> >> Does stopdaemon also flush memtables and stop trift and CQL interface >> before shutting down the daemon ? does node also announce shutting down >> mess

Re: Why there is no native shutdown command in cassandra

stand why, it's because C* was designed to be > crash-only. > > https://www.usenix.org/conference/hotos-ix/crash-only-software > > Since this is great for the project but bad for operators experience we > have later added this stopdaemon command. > > On Mon, Jun 13,

Re: Why there is no native shutdown command in cassandra

<doanduy...@gmail.com> wrote: > In Cassandra 3.x, I think there is a "nodetool stopdaemon" command > > On Mon, Jun 13, 2016 at 6:28 PM, Anshu Vajpayee <anshu.vajpa...@gmail.com> > wrote: > >> Hi All >> >> Why we dont have native shutdown comman

Re: select query on entire primary key returning more than one row in result

were all rows same? If not what was different ? What was droppable tombstone compaction ratio for that table/CF? On Mon, Jun 13, 2016 at 6:11 PM, Siddharth Verma < verma.siddha...@snapdeal.com> wrote: > Running nodetool compact fixed the issue. > > Could someone help out as why it occurred. >

Re: Why there is no native shutdown command in cassandra

detool flush. On Mon, Jun 13, 2016 at 10:00 PM, Jeff Jirsa <jeff.ji...@crowdstrike.com> wrote: > `nodetool drain` > > > > > > *From: *Anshu Vajpayee <anshu.vajpa...@gmail.com> > *Reply-To: *"user@cassandra.apache.org" <user@cassandra.apache.org>

Why there is no native shutdown command in cassandra

Hi All Why we dont have native shutdown command in Cassandra ? Every software provides graceful shutdown command. ​Regards, Anshu​

Per node limit for Disk Space

Hi All, I have question regarding max disk space limit on a node. As per Data stax, We can have 1TB max disk space for rotational disks and up to 5 TB for SSDs on a node. Could you please suggest per your experience what would be limit for space on a single node with out causing so much stress