Re: A proposed use case, any comments and experience is appreciated
Expiring columns are 0.7 only. An expired column behaves like a deleted column until it is compacted away. On Mon, Oct 4, 2010 at 8:48 AM, Utku Can Topçu u...@topcu.gen.tr wrote: Hi Jonathan, Thank you for mentioning about the expiring columns issue. I didn't know that it had existed. That's really great news. First of all, does the current 0.6 branch support it? If not so, is the patch available for the 0.6.5 somehow? And about the deletion issue, if all the columns in a row expire? When the row will be deleted, will I be seeing the row in my map inputs somehow, and for how long? Regards, Utku On Mon, Oct 4, 2010 at 3:30 PM, Jonathan Ellis jbel...@gmail.com wrote: A simpler approach might be to insert expiring columns into a 2nd CF with a TTL of one hour. On Mon, Oct 4, 2010 at 5:12 AM, Utku Can Topçu u...@topcu.gen.tr wrote: Hey All, I'm planning to run Map/Reduce on one of the ColumnFamilies. The keys are formed in such a fashion that, they are indexed in descending order by time. So I'll be analyzing the data for every hour iteratively. Since the current Hadoop integration does not support partial columnfamily analysis. I feel that, I'll need to dump the data of the last hour and put it to the hadoop cluster and do my analysis on the flat text file. Do you think of any other better way of getting the data of a keyrange into a hadoop cluster for analysis? Regards, Utku -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com
Re: A proposed use case, any comments and experience is appreciated
A simpler approach might be to insert expiring columns into a 2nd CF with a TTL of one hour. On Mon, Oct 4, 2010 at 5:12 AM, Utku Can Topçu u...@topcu.gen.tr wrote: Hey All, I'm planning to run Map/Reduce on one of the ColumnFamilies. The keys are formed in such a fashion that, they are indexed in descending order by time. So I'll be analyzing the data for every hour iteratively. Since the current Hadoop integration does not support partial columnfamily analysis. I feel that, I'll need to dump the data of the last hour and put it to the hadoop cluster and do my analysis on the flat text file. Do you think of any other better way of getting the data of a keyrange into a hadoop cluster for analysis? Regards, Utku -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com
Re: A proposed use case, any comments and experience is appreciated
What I can understand from behaving like a deleted column is - They'll be there for at most GCGraceSeconds? On Mon, Oct 4, 2010 at 3:51 PM, Jonathan Ellis jbel...@gmail.com wrote: Expiring columns are 0.7 only. An expired column behaves like a deleted column until it is compacted away. On Mon, Oct 4, 2010 at 8:48 AM, Utku Can Topçu u...@topcu.gen.tr wrote: Hi Jonathan, Thank you for mentioning about the expiring columns issue. I didn't know that it had existed. That's really great news. First of all, does the current 0.6 branch support it? If not so, is the patch available for the 0.6.5 somehow? And about the deletion issue, if all the columns in a row expire? When the row will be deleted, will I be seeing the row in my map inputs somehow, and for how long? Regards, Utku On Mon, Oct 4, 2010 at 3:30 PM, Jonathan Ellis jbel...@gmail.com wrote: A simpler approach might be to insert expiring columns into a 2nd CF with a TTL of one hour. On Mon, Oct 4, 2010 at 5:12 AM, Utku Can Topçu u...@topcu.gen.tr wrote: Hey All, I'm planning to run Map/Reduce on one of the ColumnFamilies. The keys are formed in such a fashion that, they are indexed in descending order by time. So I'll be analyzing the data for every hour iteratively. Since the current Hadoop integration does not support partial columnfamily analysis. I feel that, I'll need to dump the data of the last hour and put it to the hadoop cluster and do my analysis on the flat text file. Do you think of any other better way of getting the data of a keyrange into a hadoop cluster for analysis? Regards, Utku -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com
Re: Dazed and confused with Cassandra on EC2 ...
Hi Peter, Thanks again for your time and thoughts on this problem. We think we've got a bit ahead of the problem by just scaling back (quite savagely) on the rate that we try to hit the cluster. Previously, with a surplus of optimism, we were throwing very big Hadoop jobs at Cassandra, including what I understand to be a worst-case usage (random reads). Now we're throttling right back on the number of parallel jobs that we fire from Hadoop, and we're seeing better performance, in terms of the boxes generally staying up as far as nodetool and other interactive sessions are concerned. As discussed, we've adopted quite a number of different approaches with GC - at the moment we've returned to: JVM_OPTS= \ -ea \ -Xms2G \ -Xmx3G \ -XX:+UseParNewGC \ -XX:+UseConcMarkSweepGC \ -XX:+CMSParallelRemarkEnabled \ -XX:SurvivorRatio=8 \ -XX:MaxTenuringThreshold=1 \ -XX:+HeapDumpOnOutOfMemoryError \ -Dcom.sun.management.jmxremote.port=8080 \ -Dcom.sun.management.jmxremote.ssl=false \ -Dcom.sun.management.jmxremote.authenticate=false ... which is much closer to the default as shipped - notable change is the heap size, which out of the box comes as 1G. There's some words on the 'Net that - the recent pages on Riptano's site in fact - that strongly encourage scaling left and right, rather than beefing up the boxes - and certainly we're seeing far less bother from GC using a much smaller heap - previously we'd been going up to 16GB, or even higher. This is based on my previous positive experiences of getting better performance from memory hog apps (eg. Java) by giving them more memory. In any case, it seems that using large amounts of memory on EC2 is just asking for trouble. And because it's Amazon, more smaller machines generally works out as the same CPU grunt per dollar, of course .. although the management costs go up. To answer your last question there - we'd been using some pretty beefy EC2 boxes, but now we think we'll head back to the 2-core 7GB medium-ish sized machines I think. All IO still runs like a dog no matter how much money you spend, sadly. cheers, Jedd.
Re: Hardware change of a node in the cluster
On 4 October 2010 10:58, Utku Can Topçu u...@topcu.gen.tr wrote: Recently I've tried to upgrade (hw upgrade) one of the nodes in my cassandra cluster from ec2-small to ec2-large. Something that bit me on this (I've done it with both Cassandra and Hadoop boxes, and some problems might be more Hadoopy related) is hostname. You need to change /etc/hostname and probably (unless you're happy to reboot again) the commandline of this too, to change it in the current instance. I found it best to drop all Cass instances (drain then stop), just to be a bit more confident. j.
Re: A proposed use case, any comments and experience is appreciated
Hi Jonathan, Thank you for mentioning about the expiring columns issue. I didn't know that it had existed. That's really great news. First of all, does the current 0.6 branch support it? If not so, is the patch available for the 0.6.5 somehow? And about the deletion issue, if all the columns in a row expire? When the row will be deleted, will I be seeing the row in my map inputs somehow, and for how long? Regards, Utku On Mon, Oct 4, 2010 at 3:30 PM, Jonathan Ellis jbel...@gmail.com wrote: A simpler approach might be to insert expiring columns into a 2nd CF with a TTL of one hour. On Mon, Oct 4, 2010 at 5:12 AM, Utku Can Topçu u...@topcu.gen.tr wrote: Hey All, I'm planning to run Map/Reduce on one of the ColumnFamilies. The keys are formed in such a fashion that, they are indexed in descending order by time. So I'll be analyzing the data for every hour iteratively. Since the current Hadoop integration does not support partial columnfamily analysis. I feel that, I'll need to dump the data of the last hour and put it to the hadoop cluster and do my analysis on the flat text file. Do you think of any other better way of getting the data of a keyrange into a hadoop cluster for analysis? Regards, Utku -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com
Hardware change of a node in the cluster
Hey All, Recently I've tried to upgrade (hw upgrade) one of the nodes in my cassandra cluster from ec2-small to ec2-large. However, there were problems and since the IP of the new instance was different from the previous instance. The other nodes didnot recognize it in the ring. So what should be the best practice for a complete hardware change of one node in the cluster while keeping the data that it has. Regards, Utku
Re: Hardware change of a node in the cluster
It should work this way: 1. Move your data to the new node (scp, etc.) 2. Make sure the new node is configured to use the same token as the new node. 3. Stand up the new node. 4. Turn off the old node. If your environment is volatile, it's probably best to run `nodetool repair` on the new node. Gary. On Mon, Oct 4, 2010 at 04:58, Utku Can Topçu u...@topcu.gen.tr wrote: Hey All, Recently I've tried to upgrade (hw upgrade) one of the nodes in my cassandra cluster from ec2-small to ec2-large. However, there were problems and since the IP of the new instance was different from the previous instance. The other nodes didnot recognize it in the ring. So what should be the best practice for a complete hardware change of one node in the cluster while keeping the data that it has. Regards, Utku
Re: 0.7.0 beta1 to beta2 rolling upgrade error
from the Upgrading section of NEWS.txt: The Cassandra inter-node protocol is incompatible with 0.6.x releases (and with 0.7 beta1), meaning you will have to bring your cluster down prior to upgrading On Mon, Oct 4, 2010 at 8:53 AM, Ian Rogers ian.rog...@contactclean.com wrote: I've tried to do a rolling upgrade of a 3-node ring from beta1 to beta2 but got the error below. The new node seems to come up fine - I can connect to it with cassandra-cli and see the keyspaces - but it doesn't join the ring. My method was: - stop old cassandra - mv old cassandra dir to new place - unpack http://mirror.lividpenguin.com/pub/apache//cassandra/0.7.0/apache-cassandra-0.7.0-beta1-bin.tar.gz - edit cassandra.yaml with appropriate IP addresses - start it Any ideas what's wrong? Is this possible? Any more info you need? Regards, Ian INFO [main] 2010-10-04 14:44:24,133 CLibrary.java (line 43) JNA not found. Native methods will be disabled. INFO [main] 2010-10-04 14:44:24,174 DatabaseDescriptor.java (line 125) Loading settings from file:/usr/share/cassandra/conf/cassandra.yaml INFO [main] 2010-10-04 14:44:24,506 DatabaseDescriptor.java (line 176) DiskAccessMode 'auto' determined to be standard, indexAccessMode is standard INFO [main] 2010-10-04 14:44:24,900 SSTableReader.java (line 162) Sampling index for /var/lib/cassandra/data/system/Schema-e-2- INFO [main] 2010-10-04 14:44:24,941 SSTableReader.java (line 162) Sampling index for /var/lib/cassandra/data/system/Schema-e-1- INFO [main] 2010-10-04 14:44:24,989 SSTableReader.java (line 162) Sampling index for /var/lib/cassandra/data/system/Migrations-e-2- INFO [main] 2010-10-04 14:44:24,991 SSTableReader.java (line 162) Sampling index for /var/lib/cassandra/data/system/Migrations-e-1- INFO [main] 2010-10-04 14:44:25,005 SSTableReader.java (line 162) Sampling index for /var/lib/cassandra/data/system/LocationInfo-e-21- INFO [main] 2010-10-04 14:44:25,132 DatabaseDescriptor.java (line 443) Loading schema version 724c8cf6-cb17-11df-9c90-ed76782a4b26 INFO [main] 2010-10-04 14:44:26,403 SSTable.java (line 145) Deleted /var/lib/cassandra/data/system/LocationInfo-e-18- INFO [main] 2010-10-04 14:44:26,406 SSTable.java (line 145) Deleted /var/lib/cassandra/data/system/LocationInfo-e-19- INFO [main] 2010-10-04 14:44:26,409 SSTable.java (line 145) Deleted /var/lib/cassandra/data/system/LocationInfo-e-17- INFO [main] 2010-10-04 14:44:26,411 SSTable.java (line 145) Deleted /var/lib/cassandra/data/system/LocationInfo-e-20- INFO [main] 2010-10-04 14:44:26,448 CommitLog.java (line 174) Replaying /var/lib/cassandra/commitlog/CommitLog-1286199323936.log INFO [main] 2010-10-04 14:44:27,823 CommitLog.java (line 325) Finished reading /var/lib/cassandra/commitlog/CommitLog-1286199323936.log INFO [main] 2010-10-04 14:44:27,827 CommitLogSegment.java (line 50) Creating new commitlog segment /var/lib/cassandra/commitlog/CommitLog-1286199867827.log INFO [main] 2010-10-04 14:44:27,986 ColumnFamilyStore.java (line 459) switching in a fresh Memtable for LocationInfo at CommitLogContext(file='/var/lib/cassandra/commitlog/CommitLog-1286199867827.log', position=0) INFO [main] 2010-10-04 14:44:27,997 ColumnFamilyStore.java (line 771) Enqueuing flush of memtable-locationi...@1506732(17 bytes, 1 operations) INFO [FLUSH-WRITER-POOL:1] 2010-10-04 14:44:28,000 Memtable.java (line 150) Writing memtable-locationi...@1506732(17 bytes, 1 operations) INFO [FLUSH-WRITER-POOL:1] 2010-10-04 14:44:28,322 Memtable.java (line 157) Completed flushing /var/lib/cassandra/data/system/LocationInfo-e-22-Data.db INFO [main] 2010-10-04 14:44:28,355 CommitLog.java (line 182) Log replay complete INFO [main] 2010-10-04 14:44:28,420 StorageService.java (line 331) Cassandra version: 0.7.0-beta2 INFO [main] 2010-10-04 14:44:28,421 StorageService.java (line 332) Thrift API version: 17.1.0 INFO [main] 2010-10-04 14:44:28,423 SystemTable.java (line 261) Saved Token found: 0 INFO [main] 2010-10-04 14:44:28,424 SystemTable.java (line 278) Saved ClusterName found: Test Cluster INFO [main] 2010-10-04 14:44:28,425 SystemTable.java (line 293) Saved partitioner not found. Using org.apache.cassandra.dht.RandomPartitioner INFO [main] 2010-10-04 14:44:28,428 ColumnFamilyStore.java (line 459) switching in a fresh Memtable for LocationInfo at CommitLogContext(file='/var/lib/cassandra/commitlog/CommitLog-1286199867827.log', position=276) INFO [main] 2010-10-04 14:44:28,429 ColumnFamilyStore.java (line 771) Enqueuing flush of memtable-locationi...@2883071(95 bytes, 2 operations) INFO [FLUSH-WRITER-POOL:1] 2010-10-04 14:44:28,430 Memtable.java (line 150) Writing memtable-locationi...@2883071(95 bytes, 2 operations) INFO [FLUSH-WRITER-POOL:1] 2010-10-04 14:44:28,714 Memtable.java (line 157) Completed flushing /var/lib/cassandra/data/system/LocationInfo-e-23-Data.db INFO [main] 2010-10-04 14:44:28,744
Re: 0.7.0 beta1 to beta2 rolling upgrade error
Thanks, I just pushed ahead with the rolling upgrade with bootstrap off. This just meant the beta1 cluster got smaller and dissappeared while the beta2 cluster got bigger and took over. This is only a dev system so no writes will/should have been lost. Ian On 04/10/2010 14:55, Jonathan Ellis wrote: from the Upgrading section of NEWS.txt: The Cassandra inter-node protocol is incompatible with 0.6.x releases (and with 0.7 beta1), meaning you will have to bring your cluster down prior to upgrading On Mon, Oct 4, 2010 at 8:53 AM, Ian Rogersian.rog...@contactclean.com wrote: I've tried to do a rolling upgrade of a 3-node ring from beta1 to beta2 but got the error below. The new node seems to come up fine - I can connect to it with cassandra-cli and see the keyspaces - but it doesn't join the ring. My method was: - stop old cassandra - mv old cassandra dir to new place - unpack http://mirror.lividpenguin.com/pub/apache//cassandra/0.7.0/apache-cassandra-0.7.0-beta1-bin.tar.gz - edit cassandra.yaml with appropriate IP addresses - start it Any ideas what's wrong? Is this possible? Any more info you need? Regards, Ian INFO [main] 2010-10-04 14:44:24,133 CLibrary.java (line 43) JNA not found. Native methods will be disabled. INFO [main] 2010-10-04 14:44:24,174 DatabaseDescriptor.java (line 125) Loading settings from file:/usr/share/cassandra/conf/cassandra.yaml INFO [main] 2010-10-04 14:44:24,506 DatabaseDescriptor.java (line 176) DiskAccessMode 'auto' determined to be standard, indexAccessMode is standard INFO [main] 2010-10-04 14:44:24,900 SSTableReader.java (line 162) Sampling index for /var/lib/cassandra/data/system/Schema-e-2- INFO [main] 2010-10-04 14:44:24,941 SSTableReader.java (line 162) Sampling index for /var/lib/cassandra/data/system/Schema-e-1- INFO [main] 2010-10-04 14:44:24,989 SSTableReader.java (line 162) Sampling index for /var/lib/cassandra/data/system/Migrations-e-2- INFO [main] 2010-10-04 14:44:24,991 SSTableReader.java (line 162) Sampling index for /var/lib/cassandra/data/system/Migrations-e-1- INFO [main] 2010-10-04 14:44:25,005 SSTableReader.java (line 162) Sampling index for /var/lib/cassandra/data/system/LocationInfo-e-21- INFO [main] 2010-10-04 14:44:25,132 DatabaseDescriptor.java (line 443) Loading schema version 724c8cf6-cb17-11df-9c90-ed76782a4b26 INFO [main] 2010-10-04 14:44:26,403 SSTable.java (line 145) Deleted /var/lib/cassandra/data/system/LocationInfo-e-18- INFO [main] 2010-10-04 14:44:26,406 SSTable.java (line 145) Deleted /var/lib/cassandra/data/system/LocationInfo-e-19- INFO [main] 2010-10-04 14:44:26,409 SSTable.java (line 145) Deleted /var/lib/cassandra/data/system/LocationInfo-e-17- INFO [main] 2010-10-04 14:44:26,411 SSTable.java (line 145) Deleted /var/lib/cassandra/data/system/LocationInfo-e-20- INFO [main] 2010-10-04 14:44:26,448 CommitLog.java (line 174) Replaying /var/lib/cassandra/commitlog/CommitLog-1286199323936.log INFO [main] 2010-10-04 14:44:27,823 CommitLog.java (line 325) Finished reading /var/lib/cassandra/commitlog/CommitLog-1286199323936.log INFO [main] 2010-10-04 14:44:27,827 CommitLogSegment.java (line 50) Creating new commitlog segment /var/lib/cassandra/commitlog/CommitLog-1286199867827.log INFO [main] 2010-10-04 14:44:27,986 ColumnFamilyStore.java (line 459) switching in a fresh Memtable for LocationInfo at CommitLogContext(file='/var/lib/cassandra/commitlog/CommitLog-1286199867827.log', position=0) INFO [main] 2010-10-04 14:44:27,997 ColumnFamilyStore.java (line 771) Enqueuing flush of memtable-locationi...@1506732(17 bytes, 1 operations) INFO [FLUSH-WRITER-POOL:1] 2010-10-04 14:44:28,000 Memtable.java (line 150) Writing memtable-locationi...@1506732(17 bytes, 1 operations) INFO [FLUSH-WRITER-POOL:1] 2010-10-04 14:44:28,322 Memtable.java (line 157) Completed flushing /var/lib/cassandra/data/system/LocationInfo-e-22-Data.db INFO [main] 2010-10-04 14:44:28,355 CommitLog.java (line 182) Log replay complete INFO [main] 2010-10-04 14:44:28,420 StorageService.java (line 331) Cassandra version: 0.7.0-beta2 INFO [main] 2010-10-04 14:44:28,421 StorageService.java (line 332) Thrift API version: 17.1.0 INFO [main] 2010-10-04 14:44:28,423 SystemTable.java (line 261) Saved Token found: 0 INFO [main] 2010-10-04 14:44:28,424 SystemTable.java (line 278) Saved ClusterName found: Test Cluster INFO [main] 2010-10-04 14:44:28,425 SystemTable.java (line 293) Saved partitioner not found. Using org.apache.cassandra.dht.RandomPartitioner INFO [main] 2010-10-04 14:44:28,428 ColumnFamilyStore.java (line 459) switching in a fresh Memtable for LocationInfo at CommitLogContext(file='/var/lib/cassandra/commitlog/CommitLog-1286199867827.log', position=276) INFO [main] 2010-10-04 14:44:28,429 ColumnFamilyStore.java (line 771) Enqueuing flush of memtable-locationi...@2883071(95 bytes, 2 operations) INFO [FLUSH-WRITER-POOL:1] 2010-10-04 14:44:28,430 Memtable.java (line 150)
Re: Sorting by secondary index
Yes, but probably not in 0.7.0. On Sun, Oct 3, 2010 at 12:08 PM, Petr Odut petr.o...@gmail.com wrote: Thanks for the info. Will be ever possible to going throught a secondary index (since SI is sorted by default)? My use case is to display newest comments, users, etc. SI from my point of view perfectly fits here. Thanks :) Petr Odut. Dne 2010 10 1 18:26 Jonathan Ellis jbel...@gmail.com napsal(a): No, additional expressions (the GTE here) only affect what rows come back and do not affect sort order. On Fri, Oct 1, 2010 at 10:55 AM, Petr Odut petr.o...@gmail.com wrote: OK, I have a query with... -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Ca... -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com
Re: Sorting by secondary index
partly good news, thanks Petr Odut On Mon, Oct 4, 2010 at 5:40 PM, Jonathan Ellis jbel...@gmail.com wrote: Yes, but probably not in 0.7.0. On Sun, Oct 3, 2010 at 12:08 PM, Petr Odut petr.o...@gmail.com wrote: Thanks for the info. Will be ever possible to going throught a secondary index (since SI is sorted by default)? My use case is to display newest comments, users, etc. SI from my point of view perfectly fits here. Thanks :) Petr Odut. Dne 2010 10 1 18:26 Jonathan Ellis jbel...@gmail.com napsal(a): No, additional expressions (the GTE here) only affect what rows come back and do not affect sort order. On Fri, Oct 1, 2010 at 10:55 AM, Petr Odut petr.o...@gmail.com wrote: OK, I have a query with... -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Ca... -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com
first step with Cassandra
Hello all, I am here with a very basic question. I am very new to Cassandra slowly migrating from RDBMS world. Is there any worked example that I can use it to learn Cassandra? I have lots of documentation around Cassandra but any simple worked example will be of great help in understanding Cassandra and working with it, like setting up Cassandra on single node with creating a simple data store and accessing, step by step guide and sample code. Thanks very much and best regards Himanshu -- Even IMPOSSIBLE says I M POSSIBLE
Re: first step with Cassandra
Did you see twissandra linked from http://wiki.apache.org/cassandra/ArticlesAndPresentations ? (Twissandra is targetted at 0.7 now, btw.) On Mon, Oct 4, 2010 at 10:56 AM, Himanshu Jani himanshu.j...@gmail.com wrote: Hello all, I am here with a very basic question. I am very new to Cassandra slowly migrating from RDBMS world. Is there any worked example that I can use it to learn Cassandra? I have lots of documentation around Cassandra but any simple worked example will be of great help in understanding Cassandra and working with it, like setting up Cassandra on single node with creating a simple data store and accessing, step by step guide and sample code. Thanks very much and best regards Himanshu -- Even IMPOSSIBLE says I M POSSIBLE -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com
Re: first step with Cassandra
http://wiki.apache.org/cassandra/UseCases On Mon, Oct 4, 2010 at 5:56 PM, Himanshu Jani himanshu.j...@gmail.comwrote: Hello all, I am here with a very basic question. I am very new to Cassandra slowly migrating from RDBMS world. Is there any worked example that I can use it to learn Cassandra? I have lots of documentation around Cassandra but any simple worked example will be of great help in understanding Cassandra and working with it, like setting up Cassandra on single node with creating a simple data store and accessing, step by step guide and sample code. Thanks very much and best regards Himanshu -- Even IMPOSSIBLE says I M POSSIBLE -- Petr Odut [petr.o...@gmail.com]
Re: first step with Cassandra
I posted a real life example how we used cassandra to store data for a facebook chat like application. Check it out at http://www.juhonkoti.net/2010/09/25/example-how-to-model-your-data-into-nosql-with-cassandra - Juho Mäkinen On Mon, Oct 4, 2010 at 7:04 PM, Petr Odut petr.o...@gmail.com wrote: http://wiki.apache.org/cassandra/UseCases On Mon, Oct 4, 2010 at 5:56 PM, Himanshu Jani himanshu.j...@gmail.com wrote: Hello all, I am here with a very basic question. I am very new to Cassandra slowly migrating from RDBMS world. Is there any worked example that I can use it to learn Cassandra? I have lots of documentation around Cassandra but any simple worked example will be of great help in understanding Cassandra and working with it, like setting up Cassandra on single node with creating a simple data store and accessing, step by step guide and sample code. Thanks very much and best regards Himanshu -- Even IMPOSSIBLE says I M POSSIBLE -- Petr Odut [petr.o...@gmail.com]
