Re: Composite column/key creation via Hector

BTW, an issue was just fixed with dynamic columns in hector, you might want to try trunk. https://github.com/hector-client/hector/commit/2910b484629add683f61f392553e824c291fb6eb On 07/12/2012 06:25 PM, aaron morton wrote: You may have better luck on the Hector Mailing list… https://groups.go

Re: SSTable format

On 07/13/2012 08:00 PM, Michael Theroux wrote: Hello, I've been trying to understand in greater detail how SStables are stored, and how information is transferred between Cassandra nodes, especially when a new node is joining a cluster. Specifically, Is information stored to SStables ordered

Re: SSTable format

disk on flush? After that point, an SStable is not modified, but can be written to another SStable through compaction? -Mike On Jul 13, 2012, at 8:22 PM, Rob Coli wrote: On Fri, Jul 13, 2012 at 5:18 PM, Dave Brosius wrote: It depends on what partitioner you use. You should be using the

Re: Batch update efficiency with composite key

Cassandra doesn't do reads before writes. It just places the updates in memtables. In effect updates are the same as inserts.Batches certainly help with network latency, and some minor amount of code repetitiion on the server side. - Original Message -From: "Leonid Ilyevsky" >;lilyev.

Re: increased RF and repair, not working?

Quorum is defined as (replication_factor / 2) + 1 therefore quorum when rf = 2 is 2! so in your case, both nodes must be up. Really, using Quorum only starts making sense as a 'quorum' when RF=3 On 07/26/2012 10:38 PM, Yan Chunlu wrote: I am using Cassandra 1.0.2, have a 3 nodes clust

Re: increased RF and repair, not working?

You have RF=2, CL= Quorum but 3 nodes. So each row is represented on 2 of the 3 nodes.If you take a node down, one of two things can happen when you attempt to read a row.The row lives on the two nodes that are still up. In this case you will successfully read the data.The row lives on one node

Re: Secondary index impact on write performance

There is a second (system managed) column family for each secondary index, so any write to a field that is indexed causes two writes, one to the main column family, and another to the index column family, where in this index column family the key is the value of the secondary column, and the va

Re: Loading data on-demand in Cassandra

When data is first written it does remain in memory until that memory is flushed. After the data is only on disk, it remains there until a read for that row-key/column is requested so in essense it's always load on demand. Currently there is no support for async notifications of changes. On

Re: Why so slow?

Are you using multiple client threads? You might want to try the stress tool in the distribution. On 08/19/2012 02:09 PM, Peter Morris wrote: Hi all I have a Windows 7 machine (64 bit) with DataStax community server installed. Running a benchmark app on the server gives me 7000 inserts pe

Re: Why Cassandra secondary indexes are so slow on just 350k rows?

If i understand you correctly, you are only ever querying for the rows where is_exported = false, and turning them into trues. What this means is that eventually you will have 1 row in the secondary index table with 350K columns that you will never look at. It seems to me you that perhaps you

Re: anyone know how to lookup non-continguous columns BUT for prefixes?

You'd need to make n queries, or do a superset query from min>;-

Re: Using Cassandra BulkOuputFormat With newer versions of Hadoop (.23+)

I swapped in hadoop-core-1.0.3.jar and rebuilt cassandra, without issues. What problems where you having? On 09/21/2012 07:40 PM, Juan Valencia wrote: I can't seem to get Bulk Loading to Work in newer versions of Hadoop. since they switched JobContext from a class to an interface You lose bin

Re: Create Keyspace failing in 1.2rc2 with syntax error?

the format has changed, check the help in cqlsh CREATE KEYSPACE Test WITH replication = {'class':'SimpleStrategy', 'replication_factor':1}; On 12/29/2012 04:27 PM, Adam Venturella wrote: When I create a keyspace with a SimpleStrategy as outlined here: https://cassandra.apache.org/doc/cql3/C

Re: error when creating column family using cql3 and persisting datausing thrift

The statements used to create and populate the data might be mildly useful for those trying to help - Original Message -From: "Kuldeep Mishra" >;kuld.cs.mis...@gmail.com

Re: CQL : Request did not complete within rpc_timeout

If querying by a date inequality is an important access paradigm you probably want a column that represents some time bucket (a month?) And have that column be part of the cql primary key. Thus when a query is requested you can make c* happy by specifying a date bucket to pick the c* row and th

RE: cassandra cqlsh error

xss = -ea -javaagent:./../lib/jamm-0.2.5.jar -XX:+UseThreadPriorities -XX:ThreadPriorityPolicy=42 -Xms1005M -Xmx1005M -Xmn200M -XX:+HeapDumpOnOutOfMemoryError -Xss180k That is not an error, that is just 'debugging' information output to the command line. - Original Message -From: "Ku

RE: cassandra cqlsh error

This part, ERROR 13:39:24,456 Cannot open /var/lib/cassandra/data/system/Schema/system-Schema-hd-5; partitioner org.apache.cassandra.dht.RandomPartitioner does not match system partitioner org.apache.cassandra.dht.Murmur3Partitioner. Note that the default partitioner starting with Cassandra 1

Re: Cassandra/cqlsh Error: TSocket read 0 bytes

An exception occurred on the server, check the logs for the details of what happened, and post back here. On 02/07/2013 11:04 PM, Adam Venturella wrote: Has anyone encountered this before? What did I most likely break or how do I fix it?

Re: Cassandra 1.20 with Cloudera Hadoop (CDH4) Compatibility Issue

see https://issues.apache.org/jira/browse/CASSANDRA-5201 On 02/15/2013 10:05 PM, Yang Song wrote: Hi, Does anyone use CDH4's Hadoop with Cassandra to interact? The goal is simply read/write to Cassandra from Hadoop direclty using ColumnFamilyInput(Output)Format, but seems a bit compatibility

Re: unsubscribe

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Re: Cassandra Wiki Immutable?

added, thanks. On 08/18/2014 06:15 AM, Otis Gospodnetic wrote: Hi, What is the state of Cassandra Wiki -- http://wiki.apache.org/cassandra ? I tried to update a few pages, but it looks like pages are immutable. Do I need to have my Wiki username (OtisGospodnetic) added to some ACL? Thanks,

Re: Cassandra 2.1.2, Pig 0.14, Hadoop 2.6.0 does not work together

The method com.google.common.collect.Sets.newConcurrentHashSet()Ljava/util/Set; should be available in guava from 15.0 on. So guava-16.0 should be fine. It's possible guava is being picked up from somewhere else? have a global classpath variable? you might want to do URL u = YourClass.getRe

Re: Storing bi-temporal data in Cassandra

As you point out, there's not really a node-based problem with your query from a performance point of view. This is a limitation of CQL in that, cql wants to slice one section of a partition's row (no matter how big the section is). In your case, you are asking to slice multiple sections of a p

Re: Getting NoClassDefFoundError for com/datastax/spark/connector/mapper/ColumnMapper

Is there an 'initial cause' listed under that exception you gave? As NoClassDefFoundError is not exactly the same as ClassNotFoundException. It meant that ColumnMapper couldn't initialize it's static initializer, it could be because some other class couldn't be found, or it could be some other n

Re: Getting NoClassDefFoundError for com/datastax/spark/connector/mapper/ColumnMapper

oPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) *From:*Dave Brosius [mailto:dbros...@mebigfatguy.com] *Sent:* Tuesday, March 31, 2015 8:46 PM *To:* user

Re: Regarding JIRA

JIra should be left for issues that you have some confidence are bugs in cassandra or items you want as feature requests. For general questions, try the cassandra mailing lists user@cassandra.apache.org to subscribe -> user-subscr...@cassandra.apache.org or use irc #cassandra on freenode O

Re: com.datastax.driver.core.exceptions.InvalidTypeException: Invalid type for value 1 of CQL type text, expecting class java.lang.String but class [Ljava.lang.Object; provided

BoundStatement query = prBatchInsert.bind(userId, attributes.values().toArray(new *String*[attributes.size()])) On 12/07/2013 03:59 PM, Techy Teck wrote: I am trying to insert into Cassandra database using Datastax Java driver. But everytime I am getting below exception at `prBatchInsert.bin

Re: Parse xml and store data in Map using xom parser

Not really a cassandra question, but it would seem your xml file isn't particularly well designed. It would seem you need to qualify your entries with indices when put in the map, such as put("test.1.C", "0"); put("test.2.C", "50"); before figuring out the cassandra angle, i'd rethin

Re: Why was Thrift defined obsolete?

Realize that there will be more and more new features that come along as cassandra matures. It is an overwhelming certainty that these feature will be available thru the new native interface & CQL. The same level of certainty can't be given to Thrift. Certainly if you have existing applications

Re: unsubscribe

just send that email to user-unsubscribe@cassandra.apache.orgif still confused check here http://hadonejob.com/img/full/12598654.jpg - Original Message -From: "Earl Ruby" >;er...@webcdr.com

Re: java.lang.StackOverflowError with big IN list

In the mean time you can try upping the value of your -Xss setting in cassandra-env.sh to see if just a little push will take the problem away. On 01/10/2014 10:18 AM, Дмитрий Шохов wrote: https://issues.apache.org/jira/browse/CASSANDRA-6567 Thank you! 2014/1/10 Benedict Elliott Smith

Re: Failed to mkdirs $HOME/.cassandra

For now you can edit the nodetool script itself by adding -Duser.home=/tmp as in "$JAVA" $JAVA_AGENT -cp "$CLASSPATH" -Xmx32m -Duser.home=/tmp -Dlogback.configurationFile=logback-tools.xml -Dstorage-config="$CASSANDRA_CONF" org.apache.cassandra.tools.NodeTool -p $JMX_PORT $ARGS

Re: What % of cassandra developers are employed by Datastax?

The question assumes that it's likely that datastax employees become committers. Actually, it's more likely that committers become datastax employees. So this underlying tone that datastax only really 'wants' datastax employees to be cassandra committers, is really misleading. Why wouldn't a

Re: initial token crashes cassandra

What Colin is saying is that the tool you used to create the token, is not creating tokens usable for the Murmur3Partitioner. That tool is probably generating tokens for the (original) RandomPartitioner, which has a different range. On 05/17/2014 07:20 PM, Tim Dunphy wrote: Hi and thanks for

Re: Why is the cassandra documentation such poor quality?

We had a massive spam problem before we locked down the wiki, so unfortunately that was the choice we had to make. But as stated we can add you to the contributers list. What is your Wiki user name? On 2014-07-23 07:33, Peter Lin wrote: > I've tried to contribute docs to Cassandra wiki in

Recover from startup problems

Greetings, I'm running head from source, and now when i try to start up the database, i get the following exception which causes client connection failures. I'm fine with blowing away the database, just playing, but wanted to know if there is a safe way to do this. Exception encountered during

Re: Recover from startup problems

. if 0.8 doesn't start up either, remove the data directory but NOT commitlog, and restart. this will cause commitlog to be replayed -- with luck whatever is causing the problem is still in there, so if it breaks again, we have a reproducible case Thanks! On Mon, Aug 22, 2011 at 1:16 AM, D

Re: Recover from startup problems

s.jar is not in the classpath On 08/22/2011 11:24 PM, Jonathan Ellis wrote: It's erroring out trying to load the schema itself, though, which isn't supposed to happen. On Mon, Aug 22, 2011 at 10:14 PM, Dave Brosius wrote: Sure i'll try that, but I'm pretty sure it was c

Re: unsubscribe

On 10/24/2011 09:16 PM, hwj383 wrote: unsubscribe Send that email to user-unsubscr...@cassandra.apache.org

Re: SimpleAuthenticator missing in Cassandra 1.0

Had found the same thing, and updated: http://wiki.apache.org/cassandra/SimpleAuthenticator On 10/27/2011 04:25 PM, RobinUs2 wrote: It seems that org.apache.cassandra.auth.SimpleAuthenticator is missing in the cassandra 1.0 binaries. Is this on purpose or did I found a bug? -- View this messag

Determining Strategy options for a particular Strategy class

Is there a programmatic way to determine what the valid 'keys' are for the strategy options for a particular strategy class?

Re: error: "columnfamily alone is required for standard CF"

The examples are old, except (at least) there is an up to date version for java (look for 1.0.0 version) On 11/23/2011 08:24 PM, Aaron Raddon wrote: Hello, i am trying to read/write to cassandra using go and receiving this error "columnfamily alone is required for standard CF" back from cassan

Re: memory estimate for each key in the key cache

On 12/16/2011 10:13 PM, Brandon Williams wrote: On Fri, Dec 16, 2011 at 8:52 PM, Kent Tong wrote: Hi, From the source code I can see that for each key, the hash (token), the key itself (ByteBuffer) and the position (long. offset in the sstable) are stored into the key cache. The hash is an

Re: java thrift error

A ByteBuffer is not a byte[] to convert a String to a ByteBuffer do something likepublic static ByteBuffer toByteBuffer(String value) throws UnsupportedEncodingException { return ByteBuffer.wrap(value.getBytes("UTF-8")); } see http://wiki.apache.org/cassandra/ThriftExamples --

Re: setStrategy_options syntax in thrift

KsDef ksDef = new KsDef();Map>;String, String;String, String

Re: Integration Error between Cassandra and Eclipse

This works for me http://wiki.apache.org/cassandra/HowToDebug On 01/06/2012 01:18 AM, Kuldeep Sengar wrote: Hi, Can you post the error(saying that only 1 error is there), that'll make things more clear. Thanks Kuldeep Singh Sengar Opera Solutions Tech Boulevard,8th floor, Tower C, Sector 1

Re: Problems Starting Cassandra Server -

It probably would be useful to know what your yaml file looks like. On 01/17/2012 08:58 PM, Asha Subramanian wrote: I am a new user of Cassandra and want to understand the basics of Cassandra before moving to cluster installations etc.. I picked up the latest version of Cassandra from the ho

Re: Problems Starting Cassandra Server -

Change your yaml entry for data_file_directories from data_file_directories: F:\cassandra\data to data_file_directories: - F:\cassandra\data On 01/17/2012 11:54 PM, Asha Subramanian wrote: Here is the yaml file.. Thanks *From:*Dave Brosius [mailto:dbros...@mebigfatguy.com] *Sent

Re: unsubscribe

Folks who wish to unsubscribe should sent a blank email to the following address user-unsubscr...@cassandra.apache.org

Re: Unsubscribe

On 02/04/2012 12:05 PM, Andrea Loggia wrote: Unsubscribe If you wish to unsubscribe from the cassandra user list send a blank email here user-unsubscr...@cassandra.apache.org

Re: How to find a commit for specific release on git?

Based on the tags listed here: http://git-wip-us.apache.org/repos/asf?p=cassandra.git I would look here http://git-wip-us.apache.org/repos/asf?p=cassandra.git;a=commit;h=9d4c0d9a37c7d77a05607b85611c3abdaf75be94 On 02/12/2012 10:39 PM, Maki Watanabe wrote: Hello, How to find the right commit

Re: Unsubscribe

On 02/12/2012 10:53 PM, Shubham Srivastava wrote: -- Sent using BlackBerry send an email to user-unsubscr...@cassandra.apache.org

Re: problem with sliceQuery with composite column

if the composite column was rearranged as ticks:111wouldn't the result be as desired? - Original Message -From: "aaron morton" >;aa...@thelastpickle.com

Re: Issue regarding 'describe' keyword in 1.0.7 version.

What it's saying is if you define a KeySpace Foo and under it a ColumnFamily called Foo, you won't be able to use describe to describe the ColumnFamily named Foo. On 02/21/2012 07:26 AM, Rishabh Agrawal wrote: Hello, I am newbie to Cassandra. Please bear with my lame doubts. I running Cas

Re: Using cassandra at minimal expenditures

I guess the issue with 2 machines and RF=2 is that Consistency level of QUORUM is the same as ALL, so you've pretty much have little flexibility with this setup, of course this might be fine depending on what you want to do. In addition, RF=2 also means that you get no data-storage improvements

Re: TimeUUID

Given that these rows are wanted to be time buckets, you would want collisions, in fact that would be the standard way of working, so IMO, the uuid just removes the ability to bucket data and would not be wanted. On 02/28/2012 10:30 AM, Paul Loy wrote:

Re: CompositeType/DynamicCompositeType for Row Key

With Key's you get validation if you use composite types... Also, you get prettier output in cli, but the value is less than with composite columns. On 02/28/2012 11:59 AM, Philip Shon wrote: My row keys will actually be a date range. Where the first value is the starting date and the secon

Re: key sorting question

With random partitioner, the rows are sorted by the hashes of the keys, so for all intents and purposes, not sorted. This comment below really is talking about how columns are sorted, and yes when time uuids are used, they are sorted by the time component, as a time

Re: Why is row lookup much faster than column lookup

Given the hashtable nature of cassandra, finding a row is probably 'relatively' constant no matter how many columns you have.The smaller the number of columns, i suppose the more likely that all the columns will be in one sstable. If you've got a ton of columns per row, it is much more likely th

Re: Why is row lookup much faster than column lookup

sorry, should have been: Given the hashtable nature of cassandra, finding a row is probably 'relatively' constant no matter how many *rows* you have. - Original Message -----From: "Dave Brosius" >;dbros...@mebigfatguy.com

Re: Order rows numerically

if your keys are 1-n and you are using BOP, then almost certainly your ring will be massively unbalanced with the first node getting clobbered. You'll have bigger issues than getting lexical ordering. I'd try to rethink your design so that you don't need BOP. On 03/16/2012 06:49 PM, Watanabe M

Re: Issue with cassandra-cli "assume"

I think you want assume UserDetails validator as bytes; On 03/23/2012 08:09 PM, Drew Kutcharian wrote: Hi Everyone, I'm having an issue with cassandra-cli's assume command with a custom type. I tried it with the built-in BytesType and got the same error: [default@test] assume UserDetails v

Re: Issue with cassandra-cli "assume"

at 6:46 PM, Dave Brosius wrote: I think you want assume UserDetails validator as bytes; On 03/23/2012 08:09 PM, Drew Kutcharian wrote: Hi Everyone, I'm having an issue with cassandra-cli's assume command with a custom type. I tried it with the built-in BytesType and got the same e

Re: counter column family

Counter columns are special, they must be in a column family to themselves. On 03/27/2012 09:32 AM, puneet loya wrote: wen i m using a counter column.. i m nt able to add columns of other type to the column family.. is it so or it is just synactical error?? [default@CMDCv99] create column fami

Re: Using Thrift

For a thrift client, you need the following jars at a minimum apache-cassandra-clientutil-*.jar apache-cassandra-thrift-*.jar libthrift-*.jar slf4j-api-*.jar slf4j-log4j12-*.jar all of these jars can be found in the cassandra distribution. On 04/02/2012 07:40 AM, Rishabh Agrawal wrote: Any

Re: Using Thrift

fine slf4j files in distribution. So I downloaded them can you help me how to configure it. *From:*Dave Brosius [mailto:dbros...@mebigfatguy.com] *Sent:* Monday, April 02, 2012 6:28 PM *To:* user@cassandra.apache.org *Subject:* Re: Using Thrift For a thrift client, you need the following jars

Re: Why so many SSTables?

It's easy to spend other people's money, but handling 1TB of data with 1.5 g heap? Memory is cheap, and just a little more will solve many problems. On 04/11/2012 08:43 AM, Romain HARDOUIN wrote: Thank you for your answers. I originally post this question because we encoutered an OOM Excep

Re: Trying to avoid super columns

If you want to reduce the number of columns, you could pack all the data for a product into one column, as in composite column name-> product_id_1:12.44:1.00:3.00 On 04/12/2012 03:03 PM, Philip Shon wrote: I am currently working on a data model where the purpose is to look up multiple produ

Re: Column Family per User

Your design should be around how you want to query. If you are only querying by user, then having a user as part of the row key makes sense. To manage row size, you should think of a row as being a bucket of time. Cassandra supports a large (but not without bounds) row size. To manage row size

Re: Column Family per User

Yes in this cassandra model, time wouldn't be a column value, it would be part of the column name. Depending on how you want to access your data (give me all data points for time X) and how many separate datapoints you have for time X, you might consider packing all the data for a time in one co

Re: Column Family per User

Yes in this cassandra model, time wouldn't be a column value, it would be part of the column name. Depending on how you want to access your data (give me all data points for time X) and how many separate datapoints you have for time X, you might consider packing all the data for a time in one

Re: Column Family per User

It seems to me you are on the right track. Finding the right balance of # rows vs row width is the part that will take the most experimentation. - Original Message -From: "Trevor Francis" >;trevor.fran...@tgrahamcapital.com

Re: 200TB in Cassandra ?

I think your math is 'relatively' correct. It would seem to me you should focus on how you can reduce the amount of storage you are using per item, if at all possible, if that node count is prohibitive. On 04/19/2012 07:12 AM, Franc Carter wrote: Hi, One of the projects I am working on is go

Re: Bad Request: No indexed columns present in by-columns clause with "equals" operator

Works for me on trunk... what version are you using? On 04/23/2012 08:39 AM, mdione@orange.com wrote: I understand the error message, but I don't understand why I get it. Here's the CF: cqlsh:avatars> describe columnfamily HBX_FILE; CREATE COLUMNFAMILY HBX_FILE ( KEY blob PRIMARY KEY

Re: EC2 Best Practices

0 is a perfectly valid id.node - 1 is modulo the maximum token value. that token range is 0 - 2**127so node - 1 in this case is 2**127 - Original Message -From: "Deno Vichas" >;d...@syncopated.net

Re: Behavior on inconsistent reads

If you read at Consistency of at least quorum, you are guaranteed that at least one of the nodes has the latest data, and so you get the right data. If you read with less than quorum it would be possible for all the nodes that respond to have stale data. On 05/10/2012 09:46 PM, Carpenter, Cu

Re: primary keys query

Inequalities on secondary indices are always done in memory, so without at least one EQ on another secondary index you will be loading every row in the database, which with a massive database isn't a good idea. So by requiring at least one EQ on an index, you hopefully limit the set of rows tha

Re: Cassandra search performance

When you build a secondary index on a field, what happens is a second (hidden) column family is created for you, with the key for that column family being the value of the index field, and the columns being the keys of the entries in your column family that have that value. So in your case, you ma

Re: Retrieving old data version for a given row

The only way you could get the old value for a column would be to insert the column value, then flush, then insert the new column, then before compaction look at the old sstable. If you insert the value twice in a row without a flush, the old value is gone, as it only exists in memtables (and

Re: How to make the search by columns in range case insensitive ?

This could be accomplished with a custom 'CaseInsensitiveUTF8Type' comparator to be used as the comparator for that column family. This would require adding a class of your writing to the server. On 05/14/2012 07:26 AM, Ertio Lew wrote: I need to make a search by names index using entity name

Re: How do I add a custom comparator class to a cassandra cluster ?

it can be in a separate jar with just one class. On 05/15/2012 12:29 AM, Ertio Lew wrote: Can I put this comparator class in a separate new jar(with just this single file) or is it to be appended to the original jar along with the other comparator classes? On Tue, May 15, 2012 at 12:22 AM, To

Re: cassandra upgrade to 1.1 - migration problem

The replication factor for a keyspace is stored in the system.schema_keyspaces column family. Since you can't view this with cli as the server won't start, the only way to look at it, that i know of is to use the sstable2json tool on the *.db file for that column family... So for instance on

Re: Startup fails after updgrading from 1.0.8 to 1.1.0

Might be related to https://issues.apache.org/jira/browse/CASSANDRA-3794 On 05/16/2012 08:12 AM, Christoph Eberhardt wrote: Hi there, if updgraded cassandra from 1.0.8 to 1.1.0. It seemed to work in the first place, all seemed to work fine. So I started upgrading the rest of the cluster (a

Re: Retrieving old data version for a given row

You're in for a world of hurt going down that rabbit hole. If you truely want version data then you should think about changing your keying to perhaps be a composite key where key is of form NaturalKey/VersionId Or if you want the versioning at the column level, use composite columns with Col

Re: Startup fails after updgrading from 1.0.8 to 1.1.0

tracking issue here: https://issues.apache.org/jira/browse/CASSANDRA-4251 might be related to: https://issues.apache.org/jira/browse/CASSANDRA-3794 On 05/16/2012 08:12 AM, Christoph Eberhardt wrote: Hi there, if updgraded cassandra from 1.0.8 to 1.1.0. It seemed to work in the first place, all

Re: understanding of native indexes: limitations, potential side effects,...

Each index you define on the source CF is created using an internal CF that has as its key the value of the column it's indexing, and as its columns, all the keys of all the rows in the source CF that have that value. So if all your rows in your source CF have the same value, then your index cf

Re: unsubscribe

On 05/17/2012 09:49 PM, casablinca126.com wrote: unsubscribe send that message to user-unsubscr...@cassandra.apache.org

Re: unsubscribe

On 05/21/2012 02:44 AM, Qingyan(Evan) Liu wrote: send to user-unsubscr...@cassandra.apache.org

Re: Schema changes not getting picked up from different process

What version are you using? It might be related to https://issues.apache.org/jira/browse/CASSANDRA-4052 On 05/25/2012 07:32 AM, Victor Blaga wrote: Hi all, This is my first message on this posting list so I'm sorry if I am breaking any rules. I just wanted to report some sort of a problem th

Re: Out of memory error

What version of Cassandra? might be related to https://issues.apache.org/jira/browse/CASSANDRA-4098 On 06/11/2012 12:07 AM, Prakrati Agrawal wrote: Sorry I ran list /columnFamilyName/; and it threw this error. Thanks and Regards Prakrati *From:*aaron morton [mailto:aa...@thelastpickle.co

Re: Supercolumn behavior on writes

You can create composite columns on the fly. On 06/13/2012 09:58 PM, Greg Fausak wrote: That's a good question. I just went to a class, Ben was saying that any action on a super column requires de-re-serialization. But, it would be nice if a write had this sort of efficiency. I have been pl

Re: Supercolumn behavior on writes

Via thrift, or a high level client on thrift, see as an example http://www.datastax.com/dev/blog/introduction-to-composite-columns-part-1 On 06/13/2012 11:08 PM, Greg Fausak wrote: Interesting. How do you do it? I have a version 2 CF, that works fine. A version 3 table won't let me invent col

Re: Urgent - IllegalArgumentException during compaction and memtable flush

One of the column names on the row with key 353339332d3134363533393931 failed to validate with the validator for the column. If you really are after what column is problematic, and are able to build and run cassandra, you can add debugging info to Column.java protected void validateName(C

Re: store large String as col value

Column values are limited at 2G.Why store them as Base64? that just adds overhead. Storing the raw bytes will save you a bunch. - Original Message -From: "Cyril Auburtin" >;cyril.aubur...@gmail.com

Re: Find rows without a column

On 06/22/2012 03:57 AM, Jeff Williams wrote: Hi, It doesn't look like this is possible, but can I select all rows missing a certain column? The equivalent of "select * where col is null" in SQL. Regards, Jeff remember that there really is no such thing as a row, just arbitrary columns assoc

Re: RandomPartitioner is providing a very skewed distribution of keys across a 5-node Solandra cluster

If i read what you are saying, you are _not_ using composite keys? That's one thing that could do it, if the first part of the composite key had a very very low cardinality. On 06/24/2012 11:00 AM, Safdar Kureishy wrote: Hi, I've searched online but was unable to find any leads for the proble

Re: RandomPartitioner is providing a very skewed distribution of keys across a 5-node Solandra cluster

ar On Sun, Jun 24, 2012 at 8:38 PM, Dave Brosius mailto:dbros...@mebigfatguy.com>> wrote: If i read what you are saying, you are _not_ using composite keys? That's one thing that could do it, if the first part of the composite key had a very very low cardinality. O

Re: Quorum read after quorum write guarantee

is the read and write happening on the same thread? On 03/10/2013 12:00 PM, André Cruz wrote: Hello. In my application it sometimes happens that I execute a multiget (I use pycassa) to fetch data that I have just inserted. I use quorum writes and reads, and my RF is 3. I've noticed that some

Re: Retrieve data from Cassandra database using Datastax java driver

getColumnDefinitions only returns meta data, to get the data, use the iterator to navigate the rows Iterator it = result.iterator(); while (it.hasNext()) { Row r = it.next(); //do stuff with row } On 04/21/2013 12:02 AM, Techy Teck wrote: I am working with Datastax java-driver. And I

Re: Look table structuring advice

if you want to store all the roles in one row, you can do create table roles (synthetic_key int, name text, primary key(synthetic_key, name)) with compact storage when inserting roles, just use the same key insert into roles (synthetic_key, name) values (0, 'Programmer'); insert into roles (s

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