Re: [EXTERNAL] Re: About Cassandra stable version having Java 17 support

PM *To:* user@cassandra.apache.org *Cc:* Bowen Song *Subject:* [EXTERNAL] Re: About Cassandra stable version having Java 17 support *CAUTION:* This email originated from outside the organization. Do not click links or open attachments unless you recognize the sender and know the content is saf

Re: [EXTERNAL] Re: About Cassandra stable version having Java 17 support

user Sent: Monday, March 18, 2024 5:14 PM To: user@cassandra.apache.org Cc: Bowen Song Subject: [EXTERNAL] Re: About Cassandra stable version having Java 17 support CAUTION: This email originated from outside the organization. Do not click links or open attachments unless you recognize the s

Re: About Cassandra stable version having Java 17 support

Why Java 17? It makes no sense to choose an officially non-supported library version for a piece of software. That decision making process is the problem, not the software's library version compatibility. On 18/03/2024 09:44, Divyanshi Kaushik via user wrote: Hi All, As per my project requir

About Cassandra stable version having Java 17 support

Hi All, As per my project requirement, Java 17 needs to be used. Can you please let us know when you are planning to release the next stable version of Cassandra having Java 17 support? Regards, Divyanshi This email and any files transmitted with it are confidential, proprietary and intended s

Re: Important news about Cassandra Summit

Thank you for the update, Patrick. Appreciate all the work your team, the community and the Linux Foundation Events team have done. Looking forward to the virtual event and Cassandra Day series. > If you have open positions, call them out in this email thread or #cassandra in the ASF slack. Speak

Important news about Cassandra Summit

*Hello Cassandra Community,We all see what’s happening in tech right now. Cuts are being made, and budgets are frozen. For Cassandra Summit, this has translated to low sponsorship and registrations. The program committee has been discussing options with the Linux Foundation events team, and the dec

Re: A blog about Cassandra in the IoT arena

Understood. Deep problems to consider. Partition size. I’ve been looking at how Yugabyte is using “tablets” of data which have data. It’s an interesting proposition. .. it all comes down to the token based addressing - which is optimized as a single dimension array and I think this is part of t

Re: A blog about Cassandra in the IoT arena

No what I meant by infinite partition is not auto sub-partitioning, even at server-side. Ideally Cassandra should be able to support infinite partition size and make compaction, repair and streaming of such partitions manageable: - compaction: find a way to iterate super efficiently through the wh

Re: A blog about Cassandra in the IoT arena

Agreed. One of the ideas I had on partition size is to automatically synthetically shard based on some basic patterns seen in the data. It could be implemented as a tool that would create a new table with an additional part of the key that is an automatic created shard, or it would use an exist

Re: A blog about Cassandra in the IoT arena

As I used to tell some people, the day we make : 1. partition size unlimited, or at least huge partition easily manageable (compaction, repair, streaming, partition index file) 2. tombstone a non-issue that day, Cassandra will dominate any other IoT technology out there Until then ... On Thu, A

Re: A blog about Cassandra in the IoT arena

Good analysis of how the different key structures affect use cases and performance. I think you could extend this article with potential evaluation of FiloDB which specifically tries to solve the OLAP issue with arbitrary queries. Another option is leveraging Elassandra (index in Elasticsearch c

A blog about Cassandra in the IoT arena

Hi, we wrote a blog about some of the results that engineers from AN10 shared earlier. I am sharing it here for greater comments and discussions. http://www.an10.io/technology/cassandra-and-iot-queries-are-they-a-good-match/ Thank you. - Affan

Re: about cassandra..

Agreed about deflate. Also you can adjust your chunk size, which may help ratios as well, especially if you expect your data to compress well - often larger chunks will compress better, but it depends on the nature of your data. In the near future, look for work from Sushma @ Instagram to make av

Re: about cassandra..

Deflate instead of LZ4 will probably give you somewhat better compression at the cost of a lot of CPU. Larger chunk length might also help, but in most cases you probably won't see much benefit above 64K (and it will increase I/O load). On Wed, Aug 8, 2018 at 11:18 PM, Eunsu Kim wrote: > Hi all

about cassandra..

Hi all. I’m worried about the amount of disk I use, so I’m more curious about compression. We are currently using 3.11.0 and use default LZ4 Compressor ('chunk_length_in_kb': 64). Is there a setting that can make more powerful compression? Because most of them are time series data with TTL, we u

Re: Academic paper about Cassandra database compaction

On Mon, May 14, 2018 at 11:04 AM, Lucas Benevides < lu...@maurobenevides.com.br> wrote: > Thank you Jeff Jirsa by your comments, > > How can we do this: "fix this by not scheduling the major compaction > until we know all of the sstables in the window are available to be > compacted"? > > Would r

Re: Academic paper about Cassandra database compaction

Hello kooljava2, There aren't many books about Cassandra, but one of the most famous is the "Cassandra: The definitive guide: Distributed Data at Web Scale", by Hewitt The problem is that as Cassandra evolves very fast, these books get out of date quickly. To understand some conc

Re: Academic paper about Cassandra database compaction

Thank you Jeff Jirsa by your comments, How can we do this: "fix this by not scheduling the major compaction until we know all of the sstables in the window are available to be compacted"? About the column-family schema, I had to customize the cassandra-stress tool so that it could create a reaso

Re: Academic paper about Cassandra database compaction

Interesting! I suspect I know what the increased disk usage in TWCS, and it's a solvable problem, the problem is roughly something like this: - Window 1 has sstables 1, 2, 3, 4, 5, 6 - We start compacting 1, 2, 3, 4 (using STCS-in-TWCS first window) - The TWCS window rolls over - We flush (sstable

Re: Academic paper about Cassandra database compaction

Hello, Thank you Lucas for sharing.  I am still a beginner in Cassandra NoSQL world. Are there any other good books related to Performance tuning and Architecture overview? Thank you. On Monday, 14 May 2018, 07:57:38 GMT-7, Nitan Kainth wrote: Hi Lucas, I am not able to download. can

Re: Academic paper about Cassandra database compaction

Hi Lucas, I am not able to download. can you share as attachment in email? Regards, Nitan K. Cassandra and Oracle Architect/SME Datastax Certified Cassandra expert Oracle 10g Certified On Mon, May 14, 2018 at 9:12 AM, Lucas Benevides < lu...@maurobenevides.com.br> wrote: > Dear community, > >

Academic paper about Cassandra database compaction

Dear community, I want to tell you about my paper published in a conference in March. The title is " NoSQL Database Performance Tuning for IoT Data - Cassandra Case Study" and it is available (not for free) in http://www.scitepress.org/DigitalLibrary/Link.aspx?doi=10.5220/0006782702770284 . TWC

RE: Request for Advice about Cassandra on Bitnami AWS

Greetings Iam new to Cassandra - after having gone through the book- Cassandra- The Definitive Guide, by Eben Hewitt, I installed Cassandra on AWS EC2, using AMI Bitnami on Amazon Web Services, I successfully connected to the EC2 Ubuntu Instance and created Key Spaces and input some tables and

Re: Need Feedback about cassandra-stress tests

Might I suggest you START by using the default schema provided by cassandra-stress. Using someone else's schema is great AFTER you use have used a standard and generally well understood baseline. >From that you can decide whether a 4 node x 2 cluster is right for you. FYI, given your 6 way replica

Need Feedback about cassandra-stress tests

Hi All, I have been trying to set up a cluster for POC and ran cassandra-stress tests today on an 8 Node cluster with 2 DC having 4 nodes each. The disk used was SSD with I/O of greater than 500MB per sec, CPU- 2.3 Ghz ,4 Core Xeon and 8Gigs of RAM in each node. First of all I would like to thank

Re: Three questions about cassandra

There is a window after a node goes down that changes that node should have gotten will be kept. If the node is down LONGER than that, it will server stale data. If the consistency is greater than two, its data will be ignored (if consistency one, its data could be the first returned, if consistenc

Re: Three questions about cassandra

Thanks! Hadmut

Re: Three questions about cassandra

1) It comes online in its former state. The operator is responsible for consistency beyond that point. Common solutions would be `nodetool repair` (and if you get really smart, you can start the daemon with the thrift/native listeners disabled, run repair, and then enable listeners, so that when

Three questions about cassandra

Hi, I'm currently reading through heaps of docs and web pages to learn cassandra, but there's still three questions I could not find answers for, maybe someone could help: 1. What happens, if a node is down for some time (hours, days, weeks,...) for whatever reason (hardware, power, or netwo

Re: any update about CASSANDRA-10420

Can you provide more information? The description is generic, driver version and a test case that the devs can use to reproduce the bug would be optimal. I'm not involved in the development of cassandra, but that bug description doesn't seem complete. Maybe it is a driver bug and not a Cassandra

any update about CASSANDRA-10420

Hi, All, Can anyone give some suggestions about the https://issues.apache.org/jira/browse/CASSANDRA-10420 ? We are waiting for a solution of it. Thanks Boying

Re: what's cool about cassandra 2.1.0?

riggs. -- Cassandra/MySQL DBA. Available in San Jose area or remote. From: DuyHai Doan To: user@cassandra.apache.org Sent: Friday, September 19, 2014 7:07 AM Subject: Re: what's cool about cassandra 2.1.0? Hello Tim From this blog (http://www.datastax.co

Re: what's cool about cassandra 2.1.0?

Thanks I'll check that out! Really appreciate that! On Fri, Sep 19, 2014 at 10:07 AM, DuyHai Doan wrote: > Hello Tim > > From this blog ( > http://www.datastax.com/dev/blog/whats-new-in-cassandra-2-1) you should > find the pointers to other big topics of 2.1 > > On Fri, Sep 19, 2014 at 3:33 PM,

Re: what's cool about cassandra 2.1.0?

Hello Tim From this blog (http://www.datastax.com/dev/blog/whats-new-in-cassandra-2-1) you should find the pointers to other big topics of 2.1 On Fri, Sep 19, 2014 at 3:33 PM, Tim Dunphy wrote: > Hey all, > > I tried googling around to get an idea about what was new (and > potentially cool) i

what's cool about cassandra 2.1.0?

Hey all, I tried googling around to get an idea about what was new (and potentially cool) in the newest release of cassandra - 2.1.0. But all that I've been able to find so far is this kind of general statement about the new features. https://www.mail-archive.com/user@cassandra.apache.org/msg38

Re: Understanding about Cassandra read repair with QUORUM

> I have following understanding about Cassandra read repair: Read Repair is an automatic process that reads from more nodes than necessary during a normal read and checks and repairs differences in the background. It’s different to “repair” or Anti Entropy that you run with nodetool rep

Understanding about Cassandra read repair with QUORUM

Hi, I have following understanding about Cassandra read repair: * If we write with QUORUM and read with QUORUM then we do not need to externally (nodetool) trigger read repair.  * Since we are reading + writing with QUORUM then it is safe to set "read_repair_cha

About Cassandra-Hadoop(Pig) Integration issue

Hello Cassandra users, For one of our our new Big data BI projects, we are using Apache Cassandra 1.2.10 as our primary data store with the support of Hadoop for analytics. For prototyping purpose we have 1 node each for Apache Cassandra/Hadoop. Pig is our choice to process the data from/to C*. B

Re: Concerns about Cassandra upgrade from 1.0.6 to 1.1.X

text: > http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Concerns-about-Cassandra-upgrade-from-1-0-6-to-1-1-X-tp7581197p7581221.html > Sent from the cassandra-u...@incubator.apache.org mailing list archive at > Nabble.com.

Re: Concerns about Cassandra upgrade from 1.0.6 to 1.1.X

-about-Cassandra-upgrade-from-1-0-6-to-1-1-X-tp7581197p7581221.html Sent from the cassandra-u...@incubator.apache.org mailing list archive at Nabble.com.

Re: Concerns about Cassandra upgrade from 1.0.6 to 1.1.X

It's always a good idea to have a read of the NEWS.txt file https://github.com/apache/cassandra/blob/cassandra-1.1/NEWS.txt Cheers - Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 12/07/2012, at 5:51 PM, Tyler Hobbs wrote: > On Wed, Jul 11, 2012 at

Re: Concerns about Cassandra upgrade from 1.0.6 to 1.1.X

On Wed, Jul 11, 2012 at 8:38 PM, Roshan wrote: > > > Currently we are using Cassandra 1.0.6 in our production system but suffer > with the CASSANDRA-3616 (it is already fixed in 1.0.7 version). > > We thought to upgrade the Cassandra to 1.1.X versions, to get it's new > features, but having some

Concerns about Cassandra upgrade from 1.0.6 to 1.1.X

View this message in context: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Concerns-about-Cassandra-upgrade-from-1-0-6-to-1-1-X-tp7581197.html Sent from the cassandra-u...@incubator.apache.org mailing list archive at Nabble.com.

Re: General questions about Cassandra

Il 19/02/2012 14:51, francesco.tangari@gmail.com ha scritto: considering your question: "My question is, can also Cassandra split a "query" over the cluster like MapReduce?" and knowing the answer... as said Don Smith i suppose you are at first chapter of the book :) Yes, it is true, before

Re: General questions about Cassandra

considering your question: "My question is, can also Cassandra split a "query" over the cluster like MapReduce?" and knowing the answer... as said Don Smith i suppose you are at first chapter of the book :) -- francesco.tangari@gmail.com Inviato con Sparrow (http://www.sparrowmailapp.com

Re: General questions about Cassandra

Il 18.02.2012 09:51 francesco.tangari@gmail.com ha scritto: i suppose that he should buy http://shop.oreilly.com/product/0636920010852.do , to get an idea of what cassandra can and what can't. that's my personal thinking. I'have just bought this book: http://www.packtpub.com/cassandra-apach

Re: General questions about Cassandra

> > > Are there plans to build-in some sort of map-reduce framework into > > > Cassandra and CQL? It seems that users should be able to apply a Java > > > method to selected rows in parallel on the distributed Cassandra JVMs. I > > > believe Solandra uses such an inte

Re: General questions about Cassandra

t; Solandra uses such an integration. >> >> Don >> ____ >> From: Alessio Cecchi [ales...@skye.it] >> Sent: Friday, February 17, 2012 4:42 AM >> To: user@cassandra.apache.org >> Subject: General questions about Cas

Re: General questions about Cassandra

MapReduce and Hadoop generally are pluggable so you can do queries over HDFS, over HBase, or over Cassandra. Cassandra has good Hadoop support as outlined here: http://wiki.apache.org/cassandra/HadoopSupport. If you're looking for a simpler solution, there is DataStax's enterprise product whic

Re: General questions about Cassandra

February 17, 2012 4:42 AM > To: user@cassandra.apache.org > Subject: General questions about Cassandra > > Hi, > > we have developed a software that store logs from mail servers in MySQL, > but for huge enviroments we are developing a version that store this > data in HBase. Raw

RE: General questions about Cassandra

From: Alessio Cecchi [ales...@skye.it] Sent: Friday, February 17, 2012 4:42 AM To: user@cassandra.apache.org Subject: General questions about Cassandra Hi, we have developed a software that store logs from mail servers in MySQL, but for huge enviroments we are developing a version that

General questions about Cassandra

Hi, we have developed a software that store logs from mail servers in MySQL, but for huge enviroments we are developing a version that store this data in HBase. Raw logs are, once a day, first normalized, so the output is like this: username,date of login, IP Address, protocol username,date

Re: problem about cassandra columns

[moving to users list] See http://wiki.apache.org/cassandra/CassandraLimitations 2012/2/15 晓峰 : > I want to insert more and more columns into the super column,is there any > problem? > > > > > 晓峰 -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for profess

Re: Questions about Cassandra reads

Thanks for the update, that is very useful! On Tue, Jul 12, 2011 at 3:16 PM, Philippe wrote: > Hi Jonathan, > Thanks for the answer, I wanted to report on the improvements I got because > someone else is bound to run into the same questions... > >> >> > C) I want to access a key that is at the 50

Re: Questions about Cassandra reads

Hi Jonathan, Thanks for the answer, I wanted to report on the improvements I got because someone else is bound to run into the same questions... > > C) I want to access a key that is at the 50th position in that table, > > Cassandra will seek position 0 and then do a sequential read of the file >

Re: Questions about Cassandra reads

Ah, I get it. Your normal access pattern should be one row at a time. On Sun, Jul 3, 2011 at 11:41 AM, David Boxenhorn wrote: >>> What do you think ? >> >> I think you should strongly consider denormalizing so that you can >> read ranges from a single row instead. > > Why do you recommend denorma

Re: Questions about Cassandra reads

>> What do you think ? > > I think you should strongly consider denormalizing so that you can > read ranges from a single row instead. Why do you recommend denormalizing instead of secondary indexes?

Re: Questions about Cassandra reads

On Fri, Jun 24, 2011 at 3:58 PM, Philippe wrote: > A) Upon opening an SSTTable for read, Cassandra samples one key in 100 to > speed up disk access. Close enough. > Is the percentage configurable ? # The Index Interval determines how large the sampling of row keys # is for a given SSTable. The

Questions about Cassandra reads

Hello, I am trying to understand the way cassandra reads data. I've been reading a lot and here is what I understand. Can I get some feedback on the following claims ? Which are right and which are wrong? A) Upon opening an SSTTable for read, Cassandra samples one key in 100 to speed up disk acce

Re: Something about cassandra API

On 28 March 2011 16:33, Eric Evans wrote: > On Mon, 2011-03-28 at 14:21 +0100, Stephen Connolly wrote: >> FYI Avro is in all likelyhood being removed in 0.8 > > FWIW, Avro is long-gone at this point. You have the advantage of actually being a Cassandra Dev as opposed to being a Cassandra Hanger-o

Re: Something about cassandra API

l then Thrift is the way to go... If you are targeting 0.8, then CQL is another option (https://svn.apache.org/viewvc/cassandra/trunk/doc/cql/CQL.html?view=co). There is a JDBC driver in-tree (see drivers/java/). > 2011/3/28 An Zhuo > > > HI, I've learned something abou

Re: Something about cassandra API

On Mon, 2011-03-28 at 14:21 +0100, Stephen Connolly wrote: > FYI Avro is in all likelyhood being removed in 0.8 FWIW, Avro is long-gone at this point. -- Eric Evans eev...@rackspace.com

Re: Something about cassandra API

ly want to use something lowlevel > then Thrift is the way to go... > > > Bye, > Norman > > > > 2011/3/28 An Zhuo >> >> HI, I've learned something about Cassandra and find that there are two >> packages about how to access cassandra: avro and thrif

Re: Something about cassandra API

've learned something about Cassandra and find that there are two > packages about how to access cassandra: avro and thrift。 > > So how should I choose the suitable way with java, avro or thrift? thank > you. > > 2011-03-28 > -- > An Zhuo >

Something about cassandra API

HI, I've learned something about Cassandra and find that there are two packages about how to access cassandra: avro and thrift。 So how should I choose the suitable way with java, avro or thrift? thank you. 2011-03-28 An Zhuo

Re: Confused about CASSANDRA-1417; saving row cache

On 2011-01-11 15:41, Chris Burroughs wrote: > On 01/11/2011 02:56 PM, Peter Schuller wrote: >>> But now I need two knobs: "Max size of row cache" (best optimal steady >>> state hit rate) and "number of row cache items to read in on startup" >>> (so that the ROW-READ-STAGE does not need to drop pac

Re: Confused about CASSANDRA-1417; saving row cache

On 01/11/2011 02:56 PM, Peter Schuller wrote: >> But now I need two knobs: "Max size of row cache" (best optimal steady >> state hit rate) and "number of row cache items to read in on startup" >> (so that the ROW-READ-STAGE does not need to drop packets and node can >> be restarted in a reasonable

Re: Confused about CASSANDRA-1417; saving row cache

> This makes total sense and is obvious in hindsight.  But wouldn't such a > hypothetical "stale" row cache on be corrected by read repair (in other > words useless for write heavy workloads, not a problem for read heavy)? It's not quite that simple. For example, suppose you write to the cluster a

Re: Confused about CASSANDRA-1417; saving row cache

> But now I need two knobs:  "Max size of row cache" (best optimal steady > state hit rate) and "number of row cache items to read in on startup" > (so that the ROW-READ-STAGE does not need to drop packets and node can > be restarted in a reasonable amount of time). Good idea IMO. File a jira tick

Re: Confused about CASSANDRA-1417; saving row cache

On 01/11/2011 12:23 PM, Peter Schuller wrote: >> Is this the intentional implementation? Are there any reason not to >> just the entire row to disk to allow for faster startup? > > Intentional (in the sense of "not a mistake"), but see: > >https://issues.apache.org/jira/browse/CASSANDRA-1625

Re: Confused about CASSANDRA-1417; saving row cache

On 01/11/2011 10:11 AM, Edward Capriolo wrote: > I think because the RowCache is only saved periodically it could be > out of sync. IE saved at 12:00 changed at 12:01 then the row cache > would consistently return the wrong results since it never looks at > the disk again. I guess saving the row ca

Re: Confused about CASSANDRA-1417; saving row cache

> https://issues.apache.org/jira/browse/CASSANDRA-1417 [snip, row cache saving only keys] > Is this the intentional implementation?  Are there any reason not to > just the entire row to disk to allow for faster startup? Intentional (in the sense of "not a mistake"), but see: https://issues.a

Re: Confused about CASSANDRA-1417; saving row cache

On Tue, Jan 11, 2011 at 9:54 AM, Chris Burroughs wrote: > https://issues.apache.org/jira/browse/CASSANDRA-1417 > http://www.riptano.com/blog/whats-new-cassandra-066 > > My naive reading of CASSANDRA-1417 was that it could be used to save the > row cache to disk.  Empirically it appears to only sav

Confused about CASSANDRA-1417; saving row cache

https://issues.apache.org/jira/browse/CASSANDRA-1417 http://www.riptano.com/blog/whats-new-cassandra-066 My naive reading of CASSANDRA-1417 was that it could be used to save the row cache to disk. Empirically it appears to only save the row keys, and then reads each row. In my case I set the row

Re: questions about cassandra-1072/1546

You are right, the end is in sight for 1072 to be committed to trunk. It won't be documented for end-users or committed to 0.7 branch until we fix the drawbacks elaborated on the ticket, because that fixing won't be backwards-compatible. And at that point we'll probably be close to the next major

questions about cassandra-1072/1546

Can we get an update? After reading through the comments on 1072, it looks like this is getting close to finished, but it's hard for someone not knee-deep in the project to tell. I'm primarily interested in the timeline you foresee for getting the increment support into trunk for 0.7, and some

Re: about cassandra

On Thu, 2010-10-28 at 11:31 -0400, Jose Angel Inda Herrera wrote: > i need know, cassandra is a DB of graph No. -- Eric Evans eev...@rackspace.com

about cassandra

i need know, cassandra is a DB of graph chees

Re: question about Cassandra error

You seem to be typing 0.7 commands on a 0.6 cli. Please follow the README in the version you are using, e.g.: set Keyspace1.Standard2['jsmith']['first'] = 'John' On Thu, Sep 2, 2010 at 5:35 PM, Simon Chu wrote: > I downloaded cassendra 0.6.5 and ran it, got this error: > > bin/cassandra -f >  I

Re: question about Cassandra error

: Thursday, September 2, 2010 8:27pm To: user@cassandra.apache.org Subject: Re: question about Cassandra error Simon, See this page: http://www.riptano.com/blog/whats-new-cassandra-065 "Because of licensing issues <http://www.apache.org/legal/3party.html>, we can't distribute JNA w

Re: question about Cassandra error

Simon, See this page: http://www.riptano.com/blog/whats-new-cassandra-065 "Because of licensing issues , we can't distribute JNA with Cassandra, so you must manually add it to the Cassandra lib/ directory or otherwise place it on the classpath." On 9

question about Cassandra error

I downloaded cassendra 0.6.5 and ran it, got this error: bin/cassandra -f INFO 16:46:06,198 JNA not found. Native methods will be disabled. INFO 16:46:06,875 DiskAccessMode 'auto' determined to be mmap, indexAccessMode is mmap is this an issue? When I tried to run cassandra cli from the exampl

Re: one question about cassandra write

> a) It is a major compaction [1] > b) The old version was deleted/overwritten more than GCGraceSeconds ago [2] c) and the memtable containing the delete/overwrite has been flushed. (I suppose that's kinda obvious in retrospect, but it took me a little bit to realize this was why a 'nodetool comp

Re: one question about cassandra write

On 8/6/10 2:13 PM, Benjamin Black wrote: Assuming the old version is already on disk in an SSTable, the new version will not overwrite it, and both versions will be in the system. A compaction will remove the old version, however. To be clear, a compaction will only remove the old version if :

RE: one question about cassandra write

To: user@cassandra.apache.org Subject: one question about cassandra write Hi I have a question about the internal of cassandra write. Say, I already have the following in the database - (row_x,col_y,val1) Now if I try to insert (row_x,col_y,val100), what will happen? Will it overwrite the old

Re: one question about cassandra write

On Fri, Aug 6, 2010 at 12:51 PM, Maifi Khan wrote: > Hi > I have a question about the internal of cassandra write. > Say, I already have the following in the database - > (row_x,col_y,val1) > > Now if I try to insert > (row_x,col_y,val100), what will happen? > Will it overwrite the old data? > I m

one question about cassandra write

Hi I have a question about the internal of cassandra write. Say, I already have the following in the database - (row_x,col_y,val1) Now if I try to insert (row_x,col_y,val100), what will happen? Will it overwrite the old data? I mean, will it overwrite the data physically or will it keep both the o

Re: about cassandra compression

I've been wondering about this question as well, but from a different angle. More along the lines of should I bother to compress myself? Specifically in cases where I might want to take several small columns and compress into 1 more compact column. Each column by itself is pretty spartan and won't

Re: about cassandra compression

thanks 2010/7/26 Ran Tavory > cassandra doesn't compress before storing, no. > It may be beneficial to compress, depending on the size of your data, > network latency, disk size and data compressability... You'll need to test. > I sometimes compress, depending on data size but it's done in the c

Re: about cassandra compression

cassandra doesn't compress before storing, no. It may be beneficial to compress, depending on the size of your data, network latency, disk size and data compressability... You'll need to test. I sometimes compress, depending on data size but it's done in the client, On Mon, Jul 26, 2010 at 1:31 PM

about cassandra compression

is cassandra compression before stored? when I stored the data, is compression beneficial to reduce the storage space?