Wouldn’t you have the same problem with two similar tables with different primary keys (eg., UserByID and UserByName)? This is a very common pattern in Cassandra – inserting into multiple tables… That’s what batches are for – atomicity. I don’t understand the additional concern here.
Sean Durity From: DuyHai Doan <doanduy...@gmail.com> Sent: Monday, September 17, 2018 4:23 PM To: user <user@cassandra.apache.org> Subject: Re: [EXTERNAL] Re: cold vs hot data Sean Without transactions à la SQL, how can you guarantee atomicity between both tables for upserts ? I mean, one write could succeed with hot table and fail for cold table The only solution I see is using logged batch, with a huge overhead and perf hit on for the writes On Mon, Sep 17, 2018 at 8:28 PM, Durity, Sean R <sean_r_dur...@homedepot.com<mailto:sean_r_dur...@homedepot.com>> wrote: An idea: On initial insert, insert into 2 tables: Hot with short TTL Cold/archive with a longer (or no) TTL Then your hot data is always in the same table, but being expired. And you can access the archive table only for the more rare circumstances. Then you could have the HOT table on a different volume of faster storage. If the hot/cold tables are in different keyspaces, then you could also have different replication (a HOT DC and an archive DC, for example) Sean Durity -----Original Message----- From: Mateusz <mateusz-li...@ant.gliwice.pl<mailto:mateusz-li...@ant.gliwice.pl>> Sent: Friday, September 14, 2018 2:40 AM To: user@cassandra.apache.org<mailto:user@cassandra.apache.org> Subject: [EXTERNAL] Re: cold vs hot data On piątek, 14 września 2018 02:46:43 CEST Alaa Zubaidi (PDF) wrote: > The data can grow to +100TB however the hot data will be in most cases > less than 10TB but we still need to keep the rest of data accessible. > Anyone has this problem? > What is the best way to make the cluster more efficient? > Is there a way to somehow automatically move the old data to different > storage (rack, dc, etc)? > Any ideas? We solved it using lvmcache. -- Mateusz (...) mam brata - poważny, domator, liczykrupa, hipokryta, pobożniś, krótko mówiąc - podpora społeczeństwa." Nikos Kazantzakis - "Grek Zorba" --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org<mailto:user-unsubscr...@cassandra.apache.org> For additional commands, e-mail: user-h...@cassandra.apache.org<mailto: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. When addressed to our clients any opinions or advice contained in this Email are subject to the terms and conditions expressed in any applicable governing The Home Depot terms of business or client engagement letter. The Home Depot disclaims all responsibility and liability for the accuracy and content of this attachment and for any damages or losses arising from any inaccuracies, errors, viruses, e.g., worms, trojan horses, etc., or other items of a destructive nature, which may be contained in this attachment and shall not be liable for direct, indirect, consequential or special damages in connection with this e-mail message or its attachment. --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org<mailto:user-unsubscr...@cassandra.apache.org> For additional commands, e-mail: user-h...@cassandra.apache.org<mailto: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. When addressed to our clients any opinions or advice contained in this Email are subject to the terms and conditions expressed in any applicable governing The Home Depot terms of business or client engagement letter. The Home Depot disclaims all responsibility and liability for the accuracy and content of this attachment and for any damages or losses arising from any inaccuracies, errors, viruses, e.g., worms, trojan horses, etc., or other items of a destructive nature, which may be contained in this attachment and shall not be liable for direct, indirect, consequential or special damages in connection with this e-mail message or its attachment.
