Thanks Michael and Sean. That was very useful. Regards Anurag
On Mon, Jun 17, 2019 at 7:07 PM Durity, Sean R <sean_r_dur...@homedepot.com> wrote: > The advice so far is exactly correct for an in-place kind of upgrade. The > blog post you mentioned is different. They decided to jump versions in > Cassandra by standing up a new cluster and using a dual-write/dual-read > process for their app. They also wrote code to read and interpret sstables > in order to migrate existing data. Getting that right with compaction > running, data consistency, etc. it not easy. That is what Cassandra does, > of course. They had to reverse engineer that process. > > I would not personally take that path as it seems a more difficult way to > go -- for the DBA/admin. It is a nice path for the development team, > though. They only had to look at their reads and writes (already > encapsulated in a DAO) for the dual clusters. In a multi-upgrade scenario, > drivers and statements probably have to get upgraded at several steps along > the way (including a move from Thrift to CQL, probably). More app testing > is required each upgrade. So, the decision has to be based on which > resources you have and trust (app dev and testing + Cassandra upgrades or > data migration and testing). Once you have automated/semi-automated > Cassandra upgrades in place, that is an easier path, but that company > obviously hadn't invested there. > > Sean Durity > > -----Original Message----- > From: Michael Shuler <mshu...@pbandjelly.org> On Behalf Of Michael Shuler > Sent: Monday, June 17, 2019 8:26 AM > To: user@cassandra.apache.org > Subject: [EXTERNAL] Re: Cassandra migration from 1.25 to 3.x > > First and foremost, read NEWS.txt from your current version to the version > you wish to upgrade to. There are too may details that you many need to be > aware of. For instance, in the 2.0.0 Upgrading notes: > > > https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_apache_cassandra_blob_cassandra-2D3.11_NEWS.txt-23L1169-2DL1178&d=DwIDaQ&c=MtgQEAMQGqekjTjiAhkudQ&r=aC_gxC6z_4f9GLlbWiKzHm1vucZTtVYWDDvyLkh8IaQ&m=CPWy2XBaDFHzVDapNO4E7kLIFFfbkRd8KqftSrypjSU&s=D3Y18E9gxewpushCMETjHt9cS8lKvLMrhUdhPriF4Dk&e= > > I assume you meant 1.2.5, so you're first step is to upgrade to at least > 1.2.9 (I would suggest using latest 1.2.x, which is 1.2.19). Then you can > to to 2.0.x and up. > > Practicing on a scratch cluster is valuable experience. Reading the > upgrade notes in NEWS.txt is a must. > > -- > Kind regards, > Michael > > On 6/17/19 3:34 AM, Anurag Sharma wrote: > > Thanks Alex, > > > > I came across some interesting and efficient ways of upgrading from > > 1.x to 3.x as described in the blog here > > <https://urldefense.proofpoint.com/v2/url?u=https-3A__medium.com_-40ro > > eezilkha_database-2Dmigration-2Dat-2Dscale-2Dae85c14c3621&d=DwIDaQ&c=M > > tgQEAMQGqekjTjiAhkudQ&r=aC_gxC6z_4f9GLlbWiKzHm1vucZTtVYWDDvyLkh8IaQ&m= > > CPWy2XBaDFHzVDapNO4E7kLIFFfbkRd8KqftSrypjSU&s=7ekpEXHT1Qm_xL9l6_1Kty32 > > fDDerlB_PgO1-4K1-VQ&e= > and others. Was curious if someone has > > open-sourced their custom utility. :D > > > > Regards > > Anurag > > > > On Mon, Jun 17, 2019 at 1:27 PM Oleksandr Shulgin > > <oleksandr.shul...@zalando.de <mailto:oleksandr.shul...@zalando.de>> > wrote: > > > > On Mon, Jun 17, 2019 at 9:30 AM Anurag Sharma > > <anurag.rp.sha...@gmail.com <mailto:anurag.rp.sha...@gmail.com>> > wrote: > > > > > > We are upgrading Cassandra from 1.25 to 3.X. Just curious if > > there is any recommended open source utility for the same. > > > > > > Hi, > > > > The "recommended open source utility" is the Apache Cassandra > > itself. ;-) > > > > Given the huge difference between the major versions, though, you > > will need a decent amount of planning and preparation to > > successfully complete such a migration. Most likely you will want > > to do it in small steps, first upgrading to the latest minor version > > in the 1.x series, then making a jump to 2.x, then to 3.0, and only > > then to 3.x if you really mean to. On each upgrade step, be sure to > > examine the release notes carefully to understand if there is any > > impact for your cluster and/or client applications. Do have a test > > system with preferably identical setup and configuration and execute > > the upgrade steps there first to verify your expectations. > > > > Good luck! > > -- > > Alex > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org > For additional commands, e-mail: user-h...@cassandra.apache.org > > > ________________________________ > > The information in this Internet Email is confidential and may be legally > privileged. It is intended solely for the addressee. Access to this Email > by anyone else is unauthorized. If you are not the intended recipient, any > disclosure, copying, distribution or any action taken or omitted to be > taken in reliance on it, is prohibited and may be unlawful. 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