Re: Slow network writes

2011/2/3 Oleg Proudnikov > ruslan usifov gmail.com> writes: > > > > > > > 2011/2/3 Oleg Proudnikov cloudorange.com> > > Is it possible that the key "1212" maps to the first node? I am assuming > RF=1. > > You could try random keys to test this theory... > > > > > > Yes you right "1212" goes to

performance degradation in cluster

First time I tun single instance of Cassandra and my application on a system (16GB ram and 8 core), the time taken was 480sec. When I added one more system ,(means this time I was running 2 instance of Cassandra in cluster) and running application from single client , I found time taken in increas

Does Consistency QUORUM broken on cassandra 0.7.0 and 0.6.11

As noticed in this issue https://issues.apache.org/jira/browse/CASSANDRA-2081. Does this mean that QUORUM doesn't work on 0.7.0 and 0.6.11?

Re: how to change compare_with

Thank you. I got it from the examples provided by Hector. Vedarth Kulkarni, TYBSc (Computer Science). On Thu, Feb 3, 2011 at 6:22 AM, Jonathan Ellis wrote: > Correct. But with more and more clients being able to do intelligent > things based on metadata it's not just decoration. (UTF8Type,

Re: Schema Design Question : Supercolumn family or just a Standard column family with columns containing serialized aggregate data?

On Wed, Feb 2, 2011 at 3:27 PM, Aditya Narayan wrote: > Can I have some more feedback about my schema perhaps somewhat more > criticisive/harsh ? > It sounds reasonable to me. Since you're writing/reading all of the subcolumns at the same time, I would opt for a standard column with the tags se

Re: rolling window of data

No, Logsandra does not use a rolling window. The correct way to accomplish what you describe is the new (in 0.7) per-column TTL. Simply set this to 60 * 60 * 24 * 90 (90 day's worth of seconds) and your columns will magically disappear after that length of time. - Tyler On Wed, Feb 2, 2011 at 1

Re: Tracking down read latency

On Wed, Feb 2, 2011 at 9:35 PM, David Dabbs wrote: > We’re encountering some high read latency issues. What is reporting high read latency? > We're more read than write, though there doesn't seem to be many pending > reads. > I have seen active/pending row-read at three or four, though. In gene

RE: rolling window of data

Thanks for the link, but unfortunately it doesn't look like it uses a rolling window. As far as I can tell, log entries just keep getting inserted into Cassandra. -Jeffrey From: Aaron Morton [mailto:aa...@thelastpickle.com] Sent: Wednesday, February 02, 2011 9:21 PM To: user@cassandra.apache.or

Tracking down read latency

Hello. We’re encountering some high read latency issues. But our main Cass expert is out-of-office so it falls to me. We're more read than write, though there doesn't seem to be many pending reads. I have seen active/pending row-read at three or four, though. Pool NameActive

Re: rolling window of data

This project may provide some inspiration for you https://github.com/thobbs/logsandraNot sure if it has a rolling window, if you find out let me know :) AaronOn 03 Feb, 2011,at 06:08 PM, Jeffrey Wang wrote:Hi, We’re trying to use Cassandra 0.7 to store a rolling window of log data (e.g. last 90 da

rolling window of data

Hi, We're trying to use Cassandra 0.7 to store a rolling window of log data (e.g. last 90 days). We use the timestamp of the log entries as the column names so we can do time range queries. Everything seems to be working fine, but it's not clear if there is an efficient way to delete data that

Re: unsubscribe

http://wiki.apache.org/cassandra/FAQ#unsubscribe " How do I unsubscribe from the email list? Send an email to user-unsubscr...@cassandra.apache.org " On Wed, Feb 2, 2011 at 5:24 PM, Ronald Bradford wrote: > unsubscribe > >

Re: How do I get 0.7.1?

Stephen was mentioning that there was a vote to release 0.7.1, but there where some outstanding issues that people wanted to resolve first. Another vote and release should follow relatively soon. On Wed, Feb 2, 2011 at 5:12 PM, buddhasystem wrote: > > Stephen, sorry I didn't understand your miss

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Re: How do I get 0.7.1?

Stephen, sorry I didn't understand your missive. Maxim -- View this message in context: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/How-do-I-get-0-7-1-tp5986927p5987184.html Sent from the cassandra-u...@incubator.apache.org mailing list archive at Nabble.com.

Re: how to change compare_with

Correct. But with more and more clients being able to do intelligent things based on metadata it's not just decoration. (UTF8Type, LexicalUUIDType, BytesType, and AsciiType all have the same ordering. I believe IntegerType and LongType are equivalent orderings as well.) On Wed, Feb 2, 2011 at 3:

Re: How do I get 0.7.1?

the take #2 vote was canceled due to a couple of issues... take #3 had not been called yet - Stephen --- Sent from my Android phone, so random spelling mistakes, random nonsense words and other nonsense are a direct result of using swype to type on the screen On 2 Feb 2011 23:29, "Sal Fuentes" w

Re: how to change compare_with

Not only does the type need to make sense, but it also needs to sort in exactly the same order as the previous type did... in which case there would be no reason to change it? We should probably just say "no, you cannot do this", and explicitly prevent it. On Wed, Feb 2, 2011 at 3:14 PM, Jonathan

Re: How do I get 0.7.1?

I don't think 0.7.1 is out yet, so you'll have to wait. On Wed, Feb 2, 2011 at 3:17 PM, buddhasystem wrote: > > Thanks. > > Maxim > > -- > View this message in context: > http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/How-do-I-get-0-7-1-tp5986927p5986927.html > Sent from the ca

Re: Slow network writes

Never mind, I found it in SVN... (not in gz) Thanks. -- View this message in context: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Slow-network-writes-tp5985757p5986949.html Sent from the cassandra-u...@incubator.apache.org mailing list archive at Nabble.com.

Re: Slow network writes

Jonathan, where do I find that contrib/stress? Maxim -- View this message in context: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Slow-network-writes-tp5985757p5986937.html Sent from the cassandra-u...@incubator.apache.org mailing list archive at Nabble.com.

How do I get 0.7.1?

Thanks. Maxim -- View this message in context: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/How-do-I-get-0-7-1-tp5986927p5986927.html Sent from the cassandra-u...@incubator.apache.org mailing list archive at Nabble.com.

Re: how to change compare_with

On Wed, Feb 2, 2011 at 3:01 PM, Tyler Hobbs wrote: > I think Jonathan mispoke. I thought I was mistaken, but I was wrong. :) > You cannot change the 'compare_with' attribute of an existing column > family. You can, but it's up to you to make sure that the new type makes sense. Most frequently,

Re: Cassandra memory needs

Oleg, I just wanted to add that I confirmed the importance of that "rule of thumb" the hard way. I created two extra CFs and was able to reliably crash the nodes during writes. I guess for the final setting I'll rely on results of my testing. But it's also important to not cause the swap death o

Re: how to change compare_with

I think Jonathan mispoke. You cannot change the 'compare_with' attribute of an existing column family. The solution is to create a new column family with the data type that you need. See 'help create column family;' -- Tyler Hobbs Software Engineer, DataStax Maintainer o

Re: Cassandra memory needs

> I am trying to understand the relationship between data set/SSTable(s) size > and > Cassandra heap. http://wiki.apache.org/cassandra/LargeDataSetConsiderations > For a rough rule of thumb, Cassandra's internal datastructures will require > about  memtable_throughput_in_mb * 3 * number of hot C

Re: Slow network writes

ruslan usifov gmail.com> writes: > > > 2011/2/3 Oleg Proudnikov cloudorange.com> > Is it possible that the key "1212" maps to the first node? I am assuming RF=1. > You could try random keys to test this theory... > > > Yes you right "1212" goes to first node. I distribute tokens like describ

Re: Counters in 0.8 -- conditional?

Thanks. Yes I know it's by no means trivial. I thought in case there was an index on the column on which I want to place condition, the index machinery itself can do the counting (i.e. when the index is updated, the counter is incremented). It doesn't seem too orthogonal to the current implementat

Re: Slow network writes

2011/2/3 Oleg Proudnikov > Is it possible that the key "1212" maps to the first node? I am assuming > RF=1. > You could try random keys to test this theory... > > Yes you right "1212" goes to first node. I distribute tokens like described in "Operations": http://wiki.apache.org/cassandra/Operatio

Re: Counters in 0.8 -- conditional?

> Thanks. Just wanted to note that counting the number of rows where foo=bar is > a fairly ubiquitous task in db applications. In case of "big data", > trafficking all these data to client just to count something isn't optimal > at all. You can ask Cassandra to do the counting, but the cost is sti

Re: py_stress error in Cassandra 0.7

Have you generated Cassandra Thrift interface? You will need to install Thrift first: http://wiki.apache.org/cassandra/InstallThrift Then, in the interface directory under Cassandra's home you can run thrift --gen py cassandra.thrift If the above does not install generated cassandra thrift mo

Re: py_stress error in Cassandra 0.7

That means you have an old version of the Thrift compiler. On Wed, Feb 2, 2011 at 1:54 PM, wrote: > I tried running with the 0.7 version and get this error: > > > > Buildfile: build.xml > > > > gen-thrift-py: > > [echo] Generating Thrift Python code from > /home/ubuntu/apache-cassandra-0.7.

RE: py_stress error in Cassandra 0.7

I tried running with the 0.7 version and get this error: Buildfile: build.xml gen-thrift-py: [echo] Generating Thrift Python code from /home/ubuntu/apache-cassandra-0.7.0/interface/cassandra.thrift [exec] [WARNING:/home/ubuntu/apache-cassandra-0.7.0/interface/cassandra.thrift:375

Re: Slow network writes

Is it possible that the key "1212" maps to the first node? I am assuming RF=1. You could try random keys to test this theory... Oleg

Re: Does an unused ColumnFamily consume resources better used by "live" CFs?

Not if it's been flushed since the last time it was written to. On Wed, Feb 2, 2011 at 1:34 PM, David Dabbs wrote: > We have an old “test” CF and I was wondering if it might be taking resources > better used by our app’s CFs. > > > > Thank you. > > > > David > > -- Jonathan Ellis Project Chai

Cassandra memory needs

Hi All, I am trying to understand the relationship between data set/SSTable(s) size and Cassandra heap. Q1. Here is the memory calc from the Wiki: For a rough rule of thumb, Cassandra's internal datastructures will require about memtable_throughput_in_mb * 3 * number of hot CFs + 1G + internal

Re: how to change compare_with

I tried "help update column family". It gave me : *valid attributes are: - column_type: Super or Standard - comment: Human-readable column family description. Any string is acceptable - rows_cached: Number or percentage of rows to cache - row_cache_save_period: Period with which to

Does an unused ColumnFamily consume resources better used by "live" CFs?

We have an old "test" CF and I was wondering if it might be taking resources better used by our app's CFs. Thank you. David

Re: Pig not reading all cassandra data

I noticed in the jobtracker log that when the pig job kicks off, I get the following info message: 2011-02-02 09:13:07,269 INFO org.apache.hadoop.mapred.JobInProgress: Input size for job job_201101241634_0193 = 0. Number of splits = 1 So I looked at the job.split file that is created for the P

Re: how to change compare_with

On Wed, Feb 2, 2011 at 12:48 PM, Vedarth Kulkarni wrote: > Hello there, > > I am using Cassandra 0.7. Is there any way to change the 'compare_with' from > my program ?, I am using Hector and I am programming in Java. Yes. > Is it possible to change it from the bin/cassandra-cli ? Yes. "help up

Re: Commit log compaction

On Wed, Feb 2, 2011 at 12:29 PM, buddhasystem wrote: > > Thank you. So what is exactly the condition that causes the older commit log > files to actually be removed? "Commit log segments (whose size are controllable via the commitlog_rotation_threshold_in_mb option) are eligable for removal when

Re: Schema Design Question : Supercolumn family or just a Standard column family with columns containing serialized aggregate data?

Can I have some more feedback about my schema perhaps somewhat more criticisive/harsh ? Thanks again, Aditya Narayan On Wed, Feb 2, 2011 at 10:27 PM, Aditya Narayan wrote: > @Bill > Thank you BIll! > > @Cassandra users > Can others also leave their suggestions and comments about my schema, plea

Re: Slow network writes

You need to use multiple threads to measure throughput. I strongly recommend starting with contrib/stress from the source distribution, which is multithreaded out of the box. On Wed, Feb 2, 2011 at 9:43 AM, ruslan usifov wrote: > Hello > > I try make little cluster of 2 cassandra (0.7.0) nodes a

Re: quick shout-out to the riptano/datastax folks!

Thanks, Dave! On Wed, Feb 2, 2011 at 9:17 AM, Dave Viner wrote: > Just a quick shout-out to the riptano folks and becoming part of/forming > DataStax! > Congrats! -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www

Re: py_stress error in Cassandra 0.7

As the README suggests, you need to run ant gen-thrift-py first. On Wed, Feb 2, 2011 at 2:53 PM, wrote: > Hi, > > > > I am trying to get the py_stress to work in Cassandra 0.7. I keep getting > this error: > > > > ubuntu@ip-10-114-85-218:~/apache-cassandra-0.7.0/contrib/py_stress$ python > stres

py_stress error in Cassandra 0.7

Hi, I am trying to get the py_stress to work in Cassandra 0.7. I keep getting this error: ubuntu@ip-10-114-85-218:~/apache-cassandra-0.7.0/contrib/py_stress$ python stress.py Traceback (most recent call last): File "stress.py", line 520, in make_keyspaces() File "stress.py", line 185,

Re: Cassandra + Thrift on RedHat Enterprise 5

Thank you all. It is working fine with Hector. Vedarth Kulkarni, TYBSc (Computer Science). 2011/1/31 Vedarth Kulkarni > I will give it a try.. > > > Vedarth Kulkarni, > TYBSc (Computer Science). > > > > On Mon, Jan 31, 2011 at 7:59 AM, Shashank Tiwari wrote: > >> Why wouldn't you leverage Luc

how to change compare_with

Hello there, I am using Cassandra 0.7. Is there any way to change the 'compare_with' from my program ?, I am using Hector and I am programming in Java. OR Is it possible to change it from the bin/cassandra-cli ? Please explain me in detail if possible or suggest me a good resource on the intern

Re: Counters in 0.8 -- conditional?

Thanks. Just wanted to note that counting the number of rows where foo=bar is a fairly ubiquitous task in db applications. In case of "big data", trafficking all these data to client just to count something isn't optimal at all. Maxim -- View this message in context: http://cassandra-user-incu

Re: Commit log compaction

Thank you. So what is exactly the condition that causes the older commit log files to actually be removed? I observe that indeed they are rotated out when the threshold is reached, but then new ones a placed in the directory and the older ones are still there. Thanks, Maxim -- View this message

Re: Commit log compaction

> How often and by what criteria is the commit log compacted/truncated? Commit log segments (whose size are controllable via the commitlog_rotation_threshold_in_mb option) are eligable for removal when they do not contain any data that has yet to be flushed to memtables. In practice, the memtable

Re: Counters in 0.8 -- conditional?

> I'm looking at > http://wiki.apache.org/cassandra/Counters > > So, the counter feature -- it doesn't seem to count rows based in criteria, > such as index condition. Is that correct? Yes, it's just about supporting counters in and of themselves (which is non-trivial in a distributed system). It

Re: unsubscribe

How about adding an autosignature with unsubscription info? /Janne On Feb 2, 2011, at 19:42 , Norman Maurer wrote: > To make it short.. No it can't. > > Bye, > Norman > > (ASF Infrastructure Team) > > 2011/2/2 F. Hugo Zwaal : >> Can't the mailinglist server be changed to treat messages with

Re: 0.7.0 mx4j, get attribute

On Wed, Feb 2, 2011 at 10:40 AM, Chris Burroughs wrote: > I'm using 0.7.0 and experimenting with the new mx4j support. > > http://host:port/mbean?objectname=org.apache.cassandra.request%3Atype%3DReadStage > > Returns a nice pretty html page.  For purposes of monitoring I would > like to get a sing

0.7.0 mx4j, get attribute

I'm using 0.7.0 and experimenting with the new mx4j support. http://host:port/mbean?objectname=org.apache.cassandra.request%3Atype%3DReadStage Returns a nice pretty html page. For purposes of monitoring I would like to get a single attribute as xml. The docs [1] decribe a "getattribute" endpoin

Re: reduced cached mem; resident set size growth

On Wed, Feb 2, 2011 at 10:29 AM, Chris Burroughs wrote: > On 02/02/2011 12:49 PM, Ryan King wrote: >> We're seeing a similar problem with one of our clusters (but over a >> longer time scale). Its possible that its not a leak, but just >> fragmentation. Unless you've told it otherwise, the jvm use

Re: reduced cached mem; resident set size growth

On 02/02/2011 12:49 PM, Ryan King wrote: > We're seeing a similar problem with one of our clusters (but over a > longer time scale). Its possible that its not a leak, but just > fragmentation. Unless you've told it otherwise, the jvm uses glibc's > malloc implementation for off-heap allocations. We

Re: reduced cached mem; resident set size growth

On Wed, Feb 2, 2011 at 6:22 AM, Chris Burroughs wrote: > On 01/28/2011 09:19 PM, Chris Burroughs wrote: >> Thanks Oleg and Zhu.  I swear that wasn't a new hotspot version when I >> checked, but that's obviously not the case.  I'll update one node to the >> latest as soon as I can and report back.

Slow network writes

Hello I try make little cluster of 2 cassandra (0.7.0) nodes and I make little test in php: open(); $client->set_keyspace("test"); //- $l_row = array("qw" => "12", "as" => "67", "df" => "df", "id" => "uid", "uid" => "1

Re: unsubscribe

To make it short.. No it can't. Bye, Norman (ASF Infrastructure Team) 2011/2/2 F. Hugo Zwaal : > Can't the mailinglist server be changed to treat messages with unsubscribe > as subject as an unsubscribe as well? Otherwise it will just keep happening, > as people simply don't remember or take tim

Re: unsubscribe

I'm afraid that would unsubscribe us, no? On Wed, Feb 2, 2011 at 6:37 PM, F. Hugo Zwaal wrote: > Can't the mailinglist server be changed to treat messages with unsubscribe > as subject as an unsubscribe as well? Otherwise it will just keep happening, > as people simply don't remember or take tim

Re: unsubscribe

Can't the mailinglist server be changed to treat messages with unsubscribe as subject as an unsubscribe as well? Otherwise it will just keep happening, as people simply don't remember or take time to find out? Just my 2 cents... Groets, Hugo. On 2 feb 2011, at 16:54, Jonathan Ellis wrote

quick shout-out to the riptano/datastax folks!

Just a quick shout-out to the riptano folks and becoming part of/forming DataStax! Congrats!

Re: cassandra as session store

Sounds like you're seeing the bug in 0.7.0 preventing deletion of non-Data.db files (i.e. your Index.db) post-compaction. This is fixed for 0.7.1. (https://issues.apache.org/jira/browse/CASSANDRA-2059) On Wed, Feb 2, 2011 at 8:15 AM, Omer van der Horst Jansen wrote: > We're using Cassandra as t

Re: Schema Design Question : Supercolumn family or just a Standard column family with columns containing serialized aggregate data?

@Bill Thank you BIll! @Cassandra users Can others also leave their suggestions and comments about my schema, please. Also my question about whether to use a superColumn or alternatively, just store the data (that would otherwise be stored in subcolumns) as serialized into a single column in standa

Re: changing JMX port in 0.7

:-) On Wed, Feb 2, 2011 at 10:14 PM, Sasha Dolgy wrote: > Silly me. On windows it has to be changed in > $CASSANDRA_HOME/bin/cassandra.bat > > > On Wed, Feb 2, 2011 at 5:39 PM, Sasha Dolgy wrote: > >> An instance of Cassandra starts and is listening on the ports described >> below: >> Port De

Re: changing JMX port in 0.7

Silly me. On windows it has to be changed in $CASSANDRA_HOME/bin/cassandra.bat On Wed, Feb 2, 2011 at 5:39 PM, Sasha Dolgy wrote: > An instance of Cassandra starts and is listening on the ports described > below: > Port Description Defined In 9160 Client traffic via the Thrift > protocolcassa

Re: Schema Design Question : Supercolumn family or just a Standard column family with columns containing serialized aggregate data?

I did not understand before... sorry. Again, depending upon how many reminders you have for a single user, this could be a long/wide row. Again, it really comes down to how many reminders are we talking about and how often will they be read/written. While a single row can contain millions (may

changing JMX port in 0.7

An instance of Cassandra starts and is listening on the ports described below: Port Description Defined In 9160 Client traffic via the Thrift protocolcassandra.yaml7000Cluster traffic via gossipcassandra.yaml8080Port for monitoring attributes via JMX cassandra.in.sh My $CASSANDRA_HOME/conf/cassand

Re: Schema Design Question : Supercolumn family or just a Standard column family with columns containing serialized aggregate data?

You got me wrong perhaps.. I am already splitting the row on per user basis ofcourse, otherwise the schema wont make sense for my usage. The row contains only *reminders of a single user* sorted in chronological order. The reminder Id are stored as supercolumn name and subcolumn contain tags for t

Re: cassandra as session store

We're using Cassandra as the back end for a home grown session management system. That system was originally built back in 2005 using BerkelyDB/Java and a data distribution system that used UDP multicast. Maintenance was becoming increasingly painful. I wrote a prototype replacement service using

Re: unsubscribe

On Wed, 2011-02-02 at 07:55 -0800, JJ wrote: > Sent from my iPad This won't work (even from an iPad), you need to mail user-unsubscr...@cassandra.apache.org -- Eric Evans eev...@rackspace.com

Re: CQL

On Wed, 2011-02-02 at 06:57 +, Vivek Mishra wrote: > I am trying to run CQL from a java client and facing one issue. > Keyspace is passed as null. When I execute "Use Keyspace1" followed by > my "Select query" it is still not working. Can you provide some minimal sample code that demonstrates

Re: unsubscribe

http://wiki.apache.org/cassandra/FAQ#unsubscribe On Wed, Feb 2, 2011 at 7:55 AM, JJ wrote: > > > Sent from my iPad > -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www.datastax.com

Re: Secondary indexes on super columns

On Wed, Feb 2, 2011 at 7:37 AM, Sébastien Druon wrote: > Hi! > I would like to know if secondary indexes are foreseen for super columns / > columns inside of super columns? No. > If yes, will it be in a near future? Probably not. -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of

Re: Unsubscribe

JJ you need to be sending this to: user-unsubscr...@cassandra.apache.org Cheers... Bill- On 02/02/2011 10:58 AM, JJ wrote: Sent from my iPad

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Re: Schema Design Question : Supercolumn family or just a Standard column family with columns containing serialized aggregate data?

Any time I see/hear "a single row containing all ..." I get nervous. That single row is going to reside on a single node. That is potentially a lot of load (don't know the system) for that single node. Why wouldn't you split it by at least user? If it won't be a lot of load, then why are you usi

Re: Schema Design Question : Supercolumn family or just a Standard column family with columns containing serialized aggregate data?

I think you got it exactly what I wanted to convey except for few things I want to clarify: I was thinking of a single row containing all reminders (& not split by day). History of the reminders need to be maintained for some time. After certain time (say 3 or 6 months) they may be deleted by ttl

Secondary indexes on super columns

Hi! I would like to know if secondary indexes are foreseen for super columns / columns inside of super columns? If yes, will it be in a near future? Thanks a lot in advance Sébastien Druon

Commit log compaction

How often and by what criteria is the commit log compacted/truncated? Thanks, Maxim -- View this message in context: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Commit-log-compaction-tp5985221p5985221.html Sent from the cassandra-u...@incubator.apache.org mailing list arc

Counters in 0.8 -- conditional?

I'm looking at http://wiki.apache.org/cassandra/Counters So, the counter feature -- it doesn't seem to count rows based in criteria, such as index condition. Is that correct? Case in point, I keep a large inventory of computational tasks over a long period of time. I'm supposed to report on fair

Re: Does HH work (or make sense) for counters?

When you create a counter column family, there is an option called replicate_on_write. When this option is off then during a write the increment is written to only one node and not replicated at all. In particular it is not hinted to any node. While unsafe, if you can accept its potential conseque

Re: Schema Design Question : Supercolumn family or just a Standard column family with columns containing serialized aggregate data?

To reiterate, so I know we're both on the same page, your schema would be something like this: - A column family (as you describe) to store the details of a reminder. One reminder per row. The row key would be a TimeUUID. - A super column family to store the reminders for each user, for each

Re: Schema Design Question : Supercolumn family or just a Standard column family with columns containing serialized aggregate data?

Actually, I am trying to use Cassandra to display to users on my applicaiton, the list of all Reminders set by themselves for themselves, on the application. I need to store rows containing the timeline of daily Reminders put by the users, for themselves, on application. The reminders need to be p

Re: reduced cached mem; resident set size growth

On 01/28/2011 09:19 PM, Chris Burroughs wrote: > Thanks Oleg and Zhu. I swear that wasn't a new hotspot version when I > checked, but that's obviously not the case. I'll update one node to the > latest as soon as I can and report back. RSS over 48 hours with java 6 update 23: http://img716.ima

Schema Design Question : Supercolumn family or just a Standard column family with columns containing serialized aggregate data?

Hey all, I need to store supercolumns each with around 8 subcolumns; All the data for a supercolumn is written at once and all subcolumns need to be retrieved together. The data in each subcolumn is not big, it just contains keys to other rows. Would it be preferred to have a supercolumn family o

Re: Can a same key exists for two rows in two different column families without clashing ?

Thanks Stephen for the Great Explanation! On Wed, Feb 2, 2011 at 4:31 PM, Stephen Connolly < stephen.alan.conno...@gmail.com> wrote: > On 2 February 2011 10:03, Ertio Lew wrote: > > Can a same key exists for two rows in two different column families > without > > clashing ? Other words, does

Re: Can a same key exists for two rows in two different column families without clashing ?

On 2 February 2011 10:03, Ertio Lew wrote: > Can a same key exists for two rows in two different column families without > clashing ?  Other words, does the same algorithm needs to enforced for > generating keys for different column families or can different > algorithms(for generating keys) be en

Can a same key exists for two rows in two different column families without clashing ?

Can a same key exists for two rows in two different column families without clashing ? Other words, does the same algorithm needs to enforced for generating keys for different column families or can different algorithms(for generating keys) be enforced on column family basis? I have tried out tha