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• OTN Developer Days - Calgary, Alberta March 18 & Atlanta, GA April 1

  - by dana.singleterry

  Discover a Faster Way to Develop Ajax -Enabled Application Based on Java and SOA Standards Get Hands-on with Oracle Jdeveloper, Oracle Application Developer Framework and Oracle Fusion Middleware 11g. You are invited to attend Oracle Technology Network (OTN) Developer Day, a free, hands-on workshop that will give you insight into how to create Ajax-enabled rich Web user interfaces and Java EE-based SOA services with ease. We'll introduce you to the development platform Oracle is using for its Fusion enterprise applications, and show you how to get up to speed with it. The workshop will get you started developing with the latest versions of Oracle JDeveloper and Oracle ADF 11g, including the Ajax-enabled ADF Faces rich client components. Thursday, March 18, 2010 8:00 a.m. - 5:00 p.m. Calgary Marriott hotel 110 9th Avenue, SE Calgary, Alberta T2G 5A6 Wednesday, April 1, 2010 8:00 a.m. - 5:00 p.m. Four Seasons Hotel Atlanta 75 Fourteenth Street Atlanta, Georgia 30309 This workshop is designed for developers, project managers, and architects. Whether you are currently using Java, traditional 4GL tools like Oracle Forms, PeopleTools, and Visual Basic, or just looking for a better development platform - this session is for you. Get explanation from Oracle experts, try your hands at actual development, and get a chance to win an Apple iPod Touch and Oracle prizes. Come see how Oracle can help you deliver cutting edge UIs and standard -based applications faster with the Oracle Fusion Development software stack. At this event you will: * Get to know the Oracle Fusion development architecture and strategy from Oracle's experts. * Learn the easy way to extend your existing development skill sets to incorporate new technologies and architectures that include Service-Oriented Architecture, Java EE, and Web 2.0 * Participate in hands-on labs and experience new technologies in a familiar and productive development environment with Oracle experts guidance. Click on the Register Now Calgary, Alberta to register for the Calgary event and click on the Register Now Atlanta, GA to register for the Atlanta FREE events. Don't miss your exclusive opportunity to network with your peers and discuss today's most vital application development topics with Oracle experts.

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• Cassandra inserts using Net::Cassandra::Easy in Perl

  - by knorv

  When using the Perl module Net::Cassandra::Easy to interface with Cassandra I use the following code to read colums col[123] from rows row[123] in column-family Standard1: my $cassandra = Net::Cassandra::Easy->new(keyspace => 'Keyspace1', server => 'localhost'); $cassandra->connect(); my $result = $cassandra->get(['row1', 'row2', 'row3'], family => 'Standard1', byname => ['col1', 'col2', 'col3']); This works as expected. However, when trying to insert row row1 with .. $result = $cassandra->mutate(['row1'], family => 'Standard1', insertions => { "col1" => "Value to set." }); .. I get the error message Can't use string ("0") as a SCALAR ref while "strict refs" in use at .../Net/GenThrift/Thrift/BinaryProtocol.pm line 376. What am I doing wrong?

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• Cassandra Remote Connection

  - by Lyuben Todorov

  I'm not managing to connect to cassandra from outside machines. The database is hosted on a windows machine and im trying to connect through a mac (but this shouldn't cause problems) Local connection works: C:\cassandra\bin>cassandra-cli Starting Cassandra Client Connected to: "Test Cluster" on 127.0.0.1/9160 Welcome to Cassandra CLI version 1.1.6 But fails from other machines on the same network bin/cassandra-cli --host 192.168.0.10 --port 9160 org.apache.thrift.transport.TTransportException: java.net.ConnectException: Operation timed out at org.apache.thrift.transport.TSocket.open(TSocket.java:183) at org.apache.thrift.transport.TFramedTransport.open(TFramedTransport.java:81) at org.apache.cassandra.cli.CliMain.connect(CliMain.java:70) at org.apache.cassandra.cli.CliMain.main(CliMain.java:246) Exception connecting to 192.168.0.10/9160. Reason: Operation timed out. Welcome to Cassandra CLI version 1.2.0-beta3 Type 'help;' or '?' for help. Type 'quit;' or 'exit;' to quit. There is a router on the network but these ports have been triggred Ports: 1024, 7000, 7001, 7199, 9160 And the same ports were forwarded to 192.168.0.10 (where Cassandra is hosted) Cassandra version is 1.0.7 And the settings I think i need to change in cassandra.yaml listen_address: 192.168.0.10 rpc_address: I'm not really sure if I've missed any steps. Any help would be appreciated.

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• so, my Cassandra consultant left me and now I'm thinking about reverting to mysql

  - by sathia

  I run a middle size community and some time ago I started to develop social capabilities such as follow, status update, wall etc. For some reason i thought that Cassandra was the right tool for the job so I looked online for a Cassandra developer and I found a very talented one. Unluckily in the midst of the development the dev left (too much jobs) and so I'm here with a very nice class, a very nice demo, but a lot of fears that I won't be able to handle basic things such as compaction, scaling etc. My biggest fear is to go online with all this coolness and then having a site inaccessible for hours or days. The mysql consultant (very talented too) keeps saying me that I should stick with Mysql which I know rather well and in case something's wrong we can manage. In that case I should take the class made for cassandra and abstract it for Mysql. My question is this: Should I find another dev/consultant and stick with Cassandra because for social things it is definitely the best tool for the job, or should I listen to the Mysql consultant and revert to Mysql? About 15k login each day Average 20 actions per user Avg 6 followers x user (These are current statistics, but of course I'd like to increase them as much as possible.)

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• How do I insert a row with a TimeUUIDType column in Cassandra?

  - by mixmasteralan

  In Cassandra, I have the following Column Family: <ColumnFamily CompareWith="TimeUUIDType" Name="Posts"/> I'm trying to insert a record into it as follows using a C++ generated function generated by Thrift: ColumnPath new_col; new_col.__isset.column = true; /* this is required! */ new_col.column_family.assign("Posts"); new_col.super_column.assign(""); new_col.column.assign("1968ec4a-2a73-11df-9aca-00012e27a270"); client.insert("Keyspace1", "somekey", new_col, "Random Value", 1234, ONE); However, I'm getting the following error: "UUIDs must be exactly 16 bytes" I've even tried the Cassandra CLI with the following command: set Keyspace1.Posts['somekey']['1968ec4a-2a73-11df-9aca-00012e27a270'] = 'Random Value' but I still get the following error: Exception null InvalidRequestException(why:UUIDs must be exactly 16 bytes) at org.apache.cassandra.thrift.Cassandra$insert_result.read(Cassandra.java:11994) at org.apache.cassandra.thrift.Cassandra$Client.recv_insert(Cassandra.java:659) at org.apache.cassandra.thrift.Cassandra$Client.insert(Cassandra.java:632) at org.apache.cassandra.cli.CliClient.executeSet(CliClient.java:420) at org.apache.cassandra.cli.CliClient.executeCLIStmt(CliClient.java:80) at org.apache.cassandra.cli.CliMain.processCLIStmt(CliMain.java:132) at org.apache.cassandra.cli.CliMain.main(CliMain.java:173)

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• Best of OTN - Week of August 10th

  - by CassandraClark-OTN

  Brief pubic service announcement before we get into the OTN community best of content for the week.... Four Bands. Three Epic Nights. Join Oracle for three evenings of entertainment and fun, all during Oracle OpenWorld and JavaOne, September 28-October 2, San Francisco. Learn More Architect Community Any discussion of the best of OTN must include the OTN ArchBeat Podcast. Consistently among the top 3 most popular Oracle podcasts, Archbeat focuses on real conversations with community members. Normally I pick the topics and the guest panelists for each program, but now you have a chance to take over that role and become a Guest Producer. In that role you'll pick the discussion topic and the panelists, while I do the all of the grunt work, allowing you to bask in the glory Want to know how to become an OTN ArchBeat Podcast Guest Producer? You'll find the details here: Yes, you can take over the OTN ArchBeat Podcast! And here are two examples of OTN ArchBeat Podcasts produced by community members: Data Warehousing and Oracle Data Integrator, from July 2013, was produced by Oracle ACE Director Gurcan Orhan, and features panelists Uli Bethke , Cameron Lackpour , and Michael Rainey . DevOps, Cloud, and Role Creep, from June 2013, was produced by Oracle ACE Director Ron Batra and features panelists Basheer Khan and Cary Millsap -- OTN Architect Community Manager Bob Rhubart Database Community OTN DBA/DEV Watercooler Blog - Did You Say "JSON Support" in Oracle 12.1.0.2?. -- OTN Database Community Manager Laura Ramsey Java Community The Java Source Blog - walkmod : A Tool to Apply Coding Conventions . Friday Funny: I was worried the #NSA might be spying on me Thanks, @pacohope. -- OTN Java Community Manager Tori Weildt Systems Community The OTN Systems Community HomePage- Find Great Resources for System Admins and Developers. -- OTN Systems Community Manager Rick Ramsey

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• Best of OTN - Week of May 25th

  - by CassandraClark-OTN

  Architect Community Podcast: Going Mobile - Developing Enterprise Mobile Apps This four-part OTN ArchBeat Podcast series is devoted to a discussion about bringing mobility to the enterprise, and how architects and developers can take advantage of the opportunities in the evolution of mobile application development. Video: Data Modeling and Moving Meditation with Kent Graziano Want to learn more about Kent's Kscope 2014 data modeling sessions and how Chi Gung can help you get a great start on your day? Check out this video interview. Video: Oracle ACE Director Stewart Bryson on OBIEE, ODI, GoldenGate In this interview Stewart talks about how OBIEE, ODI, GoldenGate and other technologies fit into his Kscope 2014 sessions, and about the sessions he plans to attend. Friday Funny from OTN Architect Community Manager Bob Rhubart:Even if you're not a person of a certain age, you need read A journey into my colon -- and yours, humorist Dave Barry's wildly funny 2008 account of his colonoscopy. Because one day you will be a person of certain age... Get involved in community conversations on the following OTN channels... OTN TechBlog The Java Source Blog The OTN Garage Blog The OTN ArchBeat Blog @oracleotn @java @OTN_Garage @OTNArchBeat @OracleDBDev OTN I Love Java OTN Garage OTN ArchBeat Oracle DB Dev OTN Java OTN ArchBeat

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• Using HBase or Cassandra for a token server

  - by crippy

  I've been trying to figure out how to use HBase/Cassandra for a token system we're re-implementing. I can probably squeeze quite a lot more from MySQL, but it just seems it has come to clinging on to the wrong tool for the task just because we know it well. Eventually will hit a wall (like happened to us in other areas). Naturally I started looking into possible NoSQL solutions. The prominent ones (at least in terms of buzz) are HBase and Cassandra. The story is more or less like this: A user can send a gift other users. Each gift has a list of recipients or is public in which case limited by number or expiration date For each gift sent we generate some token that uniquely identifies that gift. For each gift we track the list of potential recipients and their current status relating to that gift (accepted, declinded etc). A user can request to see all his currently pending gifts A can request a list of users he has sent a gift to today (used to limit number of gifts sent) Required the ability to "dump" or "ignore" expired gifts (x day old gifts are considered expired) There are some other requirements but I believe the above covers the essentials. How would I go and model that using HBase or Cassandra? Well, the wall was performance. A few 10s of millions of records per day over 2 tables kept for 2 weeks (wish I could have kept it for more but there was no way). The response times kept getting slower and slower until eventually we had to start cutting down number of days we kept data. Caching helps here but it's not an ideal solution since a big part of the ops are updates. Also, as I hinted in my original post. We use MySQL extensively. We know exactly what it can and can't do both in naive implementations followed by native partitioning and finally by horizontally sharding our dataset on the application level to reside on multiple DB nodes. It can be done, but that's not really what I'm trying to get from this. I asked a very specific question about designing a solution using a NoSQL solution since it's very hard to find examples for designs out there. Brainlag, not trying to come off as rude. I actually appreciate it a lot that you are the only one who even bothered to respond. but I see it over and over again. People ask questions and others assume they have no idea what they're talking about and give an irrelevant answer. Ignore RDBMS please. The question is about nosql.

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• It's Not TV- It's OTN: Top 10 Videos on the OTN YouTube Channel

  - by Bob Rhubart

  It's been a while since we checked in on what people are watching on the Oracle Technology Network YouTube Channel. Here are the Top 10 video for the last 30 days. Tom Kyte: Keeping Up with the Latest in Database Technology Tom Kyte expands on his keynote presentation at the Great Lakes Oracle Conference with tips for developers, DBAs and others who want to make sure they are prepared to work with the latest database technologies. That Jeff Smith: Oracle SQL Developer Oracle SQL Developer product manager Jeff Smith (yeah, that Jeff Smith) talks about his presentations at the Great Lakes Oracle Conference and shares his reaction to keynote speaker C.J. Date's claim that "SQL dropped the ball." Gwen Shapira: Hadoop and Oracle Database Oracle ACE Director Gwen Shapira @gwenshap talks about the fit between Hadoop and Oracle Database and dives into the details of why Oracle Loader for Hadoop is 5x faster. Kai Yu: Virtualization and Cloud Oracle ACE Director Kai Yu talks about the questions he is most frequently asked when he does presentations on cloud computing and virtualization. Mark Sewtz: APEX 4.2 Mobile App Development Application Express developer Marc Sewtz demos the new features he built into APEX4.2 to support Mobile App Development. Jeremy Schneider: RAC Attack Oracle ACE Jeremy Schneider @jer_s describes what you can expect when you come to a RAC (Real Application Cluster) Attack. Frits Hoogland: Exadata Under the Hood Oracle ACE Director Frits Hoogland (@fritshoogland) talks about the secret sauce under Exadata's hood. David Peake: APEX 4.2 New Features David Peake, PM for Oracle Application Express, gives a quick overview of some of the new APEX features. Greg Marsden: Hugepages = Huge Performance on Linux Greg Marsden of Oracle's Linux Kernel Engineering Team talks about some common customer performance questions and making the most of Oracle Linux 6 and Transparent HugePages. John Hurley: NEOOUG and GLOC 2013 Northeast Ohio Oracle User Group president John Hurley talks about the background and success of the 2013 Great Lakes Oracle Conference.

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• ?????????98!OTN???????????????

  - by atsuko.nishihata

  ???????????????????????????? ??????????????????????????? ????????? ??????????????????????????????·??? ?????????????????? ???? OTN???? ?????? ?????? ?????????????????????????????? ?????????????????????????OTN???? ?????? ?????? ????????????????????????????? ?????3??5???500???????????? ???????????????????????? ???98(????)???Oracle Database?????????!~?????????????Oracle Database?????!~ ???????????????????? ??98??????????????????????98???????????????????????????? ????????????????! ??????????? ????????????????????????(!!)???????????

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• Cannot to connect to a Cassandra DB from localhost

  - by DJYod

  Hello, I don't know if I'm on the right site, I installed OpenSolaris a single cassandra node, I don't have other node. On the same server, I install Ruby 1.8 with the gem Cassandra. If I try to connect from my computer to the Cassandra node through the ruby gem cassandra, I can connect perfectly, if I try to to the same from the ruby gem cassandra in the server, it says that there is no listening on 127.0.0.1. I can connect locally to the instance using telnet 127.0.0.1 9160 and it works... any idea? Thank you!

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• The Loneliest Road in America and the OTN Garage

  - by rickramsey

  Source I never told anyone how the image of the OTN Garage on Facebook came to be. I took the Facebook picture on Route 50 in Nevada, USA, in October of 2010. I was riding from Colorado to Oracle OpenWorld in San Francisco, so it was probably October. Route 50 is known as "The Loneliest Road in America." There are roads across Nevada that have even LESS traffic, but Route 50 still one. desolate. road. Although I have seen stranger things while riding along Nevada's Extraterrestrial Highway, I still run across notable oddities every time I ride Route 50. Like the old man with a bandolero of water bottles jogging along the side of the highway in the middle of the day, 50 miles from the closest town. First ultra-marathoner I'd seen in action. He waved at me. Or the dozen Corvettes with California license plates driving toward me, all doing the speed limit in the middle of nowhere because they were being tailed by half a dozen Nevada state troopers. #fail. I don't remember which town I was in, but I noticed the building when I stopped at the gas station. While standing there pouring fuel into the Harley, the store caught my eye. So I pulled the bike in front and walked inside. The owner is a little old lady, about 100 years old. Most of the goods she had on the shelves looked like they had been placed there during WWII. She was itty bitty and could barely see over the counter, but she was so happy when I bought a bar of Hershey's chocolate that she gave me a five cent discount. I took a few pictures and, when I got back, Kemer Thomson, who sometimes blogs here, photoshopped the OTN Garage and Oil Change signs onto it. The bike is a 2009 Road King Classic with a Bob Dron fairing and a Corbin heated seat. The seat came in handy when I rode home over Tioga Pass. The Road King is a very comfy touring bike with a great Harley rumble. I'm kinda sorry I sold it. When I stopped for fuel about 75 miles down the road at the next town, I peeled back the chocolate bar. I had turned into powder. Probably 50 years ago. - Rick Website Newsletter Facebook Twitter

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• A catalogue of Cassandra log messages: What is the correct interpretation?

  - by knorv

  The following is a complete catalogue of all log messages generated by Cassandra 0.6 when stress-testing a Cassandra installation over an extended period of time: AntiEntropyService: Sending AEService tree for (,) to: [] CassandraDaemon: Binding thrift service to localhost/N.N.N.N:N CassandraDaemon: Cassandra starting up... ColumnFamilyStore: has reached its threshold; switching in a fresh Memtable at CommitLogContext(file='.../cassandra/commitlog/CommitLog-N.log', position=N) ColumnFamilyStore: Enqueuing flush of Memtable()@N CommitLog: Discarding obsolete commit log:CommitLogSegment(.../cassandra/commitlog/CommitLog-N.log) CommitLog: Log replay complete CommitLog: Replaying .../cassandra/commitlog/CommitLog-N.log, ... CommitLogSegment: Creating new commitlog segment .../cassandra/commitlog/CommitLog-N.log CompactionManager: Compacted to .../cassandra/data//-N-Data.db. N/N bytes for N keys. Time: Nms. CompactionManager: Compacting [org.apache.cassandra.io.SSTableReader(path='.../cassandra/data//-N-Data.db'), ...] DatabaseDescriptor: Auto DiskAccessMode determined to be mmap GCInspector: GC for ConcurrentMarkSweep: N ms, N reclaimed leaving N used; max is N GCInspector: GC for ParNew: N ms, N reclaimed leaving N used; max is N Memtable: Completed flushing .../cassandra/data//-N-Data.db Memtable: Writing Memtable()@N SSTable: Deleted .../cassandra/data//-N-Data.db SSTableDeletingReference: Deleted .../cassandra/data//-N-Data.db SSTableReader: Sampling index for .../cassandra/data//-N-Data.db StorageService: Starting up server gossip SystemTable: Saved ClusterName found: Test Cluster SystemTable: Saved ClusterName not found. Using Test Cluster SystemTable: Saved Token found: N SystemTable: Saved Token not found. Using N For each of the log messages listed - what is the correct interpretation of the log message?

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• Does Perl's Net::Cassandra module support UTF-8?

  - by knorv

  I've run into a really strange UTF-8 problem with Net::Cassandra::Easy (which is built upon Net::Cassandra): UTF-8 strings written to Cassandra are garbled upon retrieval. The following code shows the problem: use strict; use utf8; use warnings; use Net::Cassandra::Easy; binmode(STDOUT, ":utf8"); my $key = "some_key"; my $column = "some_column"; my $set_value = "\x{2603}"; my $cassandra = Net::Cassandra::Easy->new(keyspace => "Keyspace1", server => "localhost"); $cassandra->connect(); $cassandra->mutate([$key], family => "Standard1", insertions => { $column => $set_value }); my $result = $cassandra->get([$key], family => "Standard1", standard => 1); my $get_value = $result->{$key}->{"Standard1"}->{$column}; if ($set_value eq $get_value) { # this is the path I want. print "OK: $set_value == $get_value\n"; } else { # this is the path I get. print "ERR: $set_value != $get_value\n"; } When running the code above $set_value eq $get_value evaluates to false. What am I doing wrong?

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• Hot: Pre-built Developer VMs from OTN

  - by Justin Kestelyn

  For those of you who haven't already played with it, Oracle VM VirtualBox is an awfully cool desktop virtualization tool. Even better, it's free. We OTN-ers like it even more than you will though because it allows us to freeze-dry entire software stacks into VM images. Developers can simply download a few files, assemble them with a script we provide, and then import and run the resulting pre-built VM in VirtualBox. Voila, instant (insert name here) stack. These VMs are particularly handy in support of in-person workshops, but there's no reason we can't make them available for everyone. Which we have done, in Java, database, and SOA/BPM flavors. (All "ingredients" are listed at the referenced link, and they are extensive.) Now that we have the kinks worked out, other flavors are sure to become available in 2011. Now go get 'em!

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• Cassandra on heterogeneous servers

  - by happy-coding

  I am currently running 4 cassandra nodes with the following hardware in a Apache Cassandra cluster: AMD Athlon 64 X2 6000+ 8G RAM 750G hard disk It shows not such a good writing performance and a really bad read performance with sometimes also timeouts. I was wondering if it makes sense to add 2 nodes with a different hardware (8 CPUs and more RAM) to improve this. Or does a cassandra cluster works best with the same hardware in every node? Thanks & best regards

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• OTN Developer Days (Review) - San Juan, PR - April 29, 2010

  - by dana.singleterry

  A quick update on the San Juan, PR event. First off it was a great success with the Keynote audience of 200+. Mickey Ralat, Managing Director Oracle Caribbean, kicked off the event with a quick introduction followed by me delivering the Keynote Message - The Fusion Development Platform which is the first session in the regular OTN DD events that we run in North America. Following this session was a partner, SDT, basically marketing their services which covers the Oracle stack and then following was a very brief presentation on APEX. After this we broke out into the various tracks of Java, (APEX) DB SQL Developer, .NET on Oracle. After the breakout we ran the following sessions in the Java track: Developing with JDBC, UCP, and Java in Database, Rich Internet Applications in Web 2.0, Development Made Simple Without Coding: Developing Reusable Business Components. As expected with the various tracks, we ended up with 50 - 70 in the various sessions within the JAVA track and the audience was very impressed with the power of JDeveloper/ADF 11g and we got a number of questions from licensing cost to upgrading / integrating from Forms. As for the Forms questions, I fielded a number of them and for those I couldn't, I pointed them towards Grants resources which seemed to suffice. They were all, for the most part, unaware of the recent 11.1.1.3 release which occurred only a couple of days prior to the event. The indication was that they were going to download it and use it for the lab that was included on the DVD which we did not have the time for them to even start on. For those of you that attended the event, you can download the updated presentations as follows: Keynote - The Fusion Development Platform Rich Internet Applications in Web 2.0 Development Made Simple Without Coding - Developing Reusable Business Components

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• Is Cassandra production ready for Ruby on Rails?

  - by funkymunky

  I'm working on a project that is considering using Cassandra as a database. We would like to eventually migrate to Cassandra even if we use MySQL to start with, given its scalability. I know that big companies like Facebook, Digg, and recently Twitter is using Cassandra, but I don't believe any of those sites run off Rails. My question is whether or not it's feasible to use Cassandra using Ruby on Rails. Points to consider: We heavily rely on the Authlogic gem. Would switching to Cassandra affect how it works? Are there any mature ruby clients for Cassandra? Looking on Github it seems that fauna's client is the most mature. Has anyone had production experience with it? Appreciate any tips.

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• List of resources to learn cassandra

  - by Alfred

  Hi all, Lately I have been reading a lot of blog topics about big sites(facebook, twitter, digg, reddit to name a few) using cassandra as their datastore instead of MysqL. I would like to gather a list of resources to learn using cassandra. Hopefully some videos or podcasts explaining how to use cassandra. My list Twissandra - Twissandra is an example project, created to learn and demonstrate how to use Cassandra. Running the project will present a website that has similar functionality to Twitter WTF is a supercolumn - WTF is a SuperColumn? An Intro to the Cassandra Data Model I hope there are resources to watch howto use cassandra. Many thanks, Alfred

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• OTN Newsletter 12????????????????????????!

  - by OTN-J Master

  OTN Newsletter 12????????????? OTN Newsletter????????????????????????????????????????????????????? ????Newsletter??????????????????????????????????????????????????????????????Candy???????????????????????????????????????”????”???????? OTN Newsletter?????????????????????????????????????????????????????????????????????????????????????????????????????????????????! >> OTN Newsletter???·????????

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• How to find date/time used by Cassandra

  - by JDI Lloyd

  Earlier this morning I noticed that one of the nodes in our Cassandra cluster is writing logs an hour in the future, despite the date/time being correct on the OS. A couple of other nodes I checked via logs appear to be writing logs at the correct time. I now need to go through and check each node in our 80 node cluster and ensure cassandra is running on the correct time, problem being is some of the nodes don't write to the logs very often as they aren't doing much... the question is, is there some form of tool/utility (ie nodetool) that can tell me the time that cassandra is running on? All the systems date/times are correct, ntpdate cron in place has been for a while. Servers are set to Belize timezone to avoid DST changes so its nothing to do with that.

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• startup cassandra layout

  - by davidkomer

  We've got a relatively low-traffic site (~1K pageviews/day) hosted on a single server, and expect it to grow significantly over the next few years. I'm thinking of moving over to Rackspace CloudServer or EC2 and firing up 3 nodes (all on CentOS): 2 x Web (Apache) - with loadbalancer 1 x MySQL (for the Wordpress powered part) The question is where to put Cassandra right now... Should it sit on each Web node, or the MySQL node? My thought right now is to put it on Web nodes. It's my understanding that Cassandra has the benefits of fault-tolerance (i.e. if we take a node down, the site is still operational). So even with only 2 nodes, we'd have that benefit as opposed to just putting it on the MySQL node. Also, as we scale up and add another node, a cassandra instance can come along with it and the php can always run its queries on localhost. Is this a good idea?

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• OTN Developer Day: Oracle Database 11g Application Development

  - by stephen.garth

  When and Where: Tuesday June 15, 2010 from 8:00 am - 5:30 pm Hyatt Regency Reston, Reston VA This full-day FREE event offers a great learning and networking opportunity. With support from Oracle database application development experts, you'll get valuable hands-on experience developing database-backed apps with the latest Oracle tools and frameworks. Oh yeah, you get to use your own notebook and download some cool and very useful materials. Find out more and register here. var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); try { var pageTracker = _gat._getTracker("UA-13185312-1"); pageTracker._trackPageview(); } catch(err) {}

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• Why do I get an error when inserting rows with Net::Cassandra::Easy and Cassandra 0.5x?

  - by knorv

  When using the Perl module Net::Cassandra::Easy to interface with Cassandra I use the following code to read colums col[123] from rows row[123] in the column-family Standard1: my $cassandra = Net::Cassandra::Easy->new(keyspace => 'Keyspace1', server => 'localhost'); $cassandra->connect(); my $result = $cassandra->get(['row1', 'row2', 'row3'], family => 'Standard1', byname => ['col1', 'col2', 'col3']); This works as expected. However, when trying to insert row row1 with .. $result = $cassandra->mutate(['row1'], family => 'Standard1', insertions => { "col1" => "Value to set." }); .. I get the error message Can't use string ("0") as a SCALAR ref while "strict refs" in use at .../Net/GenThrift/Thrift/BinaryProtocol.pm line 376. What am I doing wrong?

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• Best of OTN - Week of Oct 21st

  - by CassandraClark-OTN

  This week's Best of OTN, for you, the best devs, dba's, sysadmins and architects out there!  In these weekly posts the OTN team will highlight the top content from each community; Architect, Database, Systems and Java.  Since we'll be publishing this on Fridays, we'll also mix in a little fun! Architect Community Top Content- The Road Ahead for WebLogic 12c | Edwin BiemondOracle ACE Edwin Biemond shares his thoughts on announced new features in Oracle WebLogic 12.1.3 & 12.1.4 and compares those upcoming releases to Oracle WebLogic 12.1.2. A Roadmap for SOA Development and Delivery | Mark NelsonDo you know the way to S-O-A? Mark Nelson does. His latest blog post, part of an ongoing series, will help to keep you from getting lost along the way. Updated ODI Statement of Direction | Robert SchweighardtHeads up Oracle Data Integrator fans! A new statement of product direction document is available, offering an overview of the strategic product plans for Oracle’s data integration products for bulk data movement and transformation, specifically Oracle Data Integrator (ODI) and Oracle Warehouse Builder (OWB). Bob Rhubart, Architect Community Manager Friday Funny - "Some people approach every problem with an open mouth." — Adlai E. Stevenson (October 23, 1835 – June 14, 1914) 23rd Vice President of the United States Database Community Top Content - Pre-Built Developer VMs (for Oracle VM VirtualBox)Heard all the chatter about Oracle VirtualBox? Over 1 million downloads per week and look: pre-built virtual appliances designed specifically for developers. Video: Big Data, or BIG DATA?Oracle Ace Director Ben Prusinski explains the differences.?? Webcast Series - Developing Applications in Oracle's Public CloudTime to get started on developing and deploying cloud applications by moving to the cloud. Good friend Gene Eun from Oracle's Cloud team posted this two-part Webcast series that has an overview and demonstration of the Oracle Database Cloud Service. Check out the demos on how to migrate your data to the cloud, extend your application with interactive reporting, and create and access RESTful Web services. Registration required, but so worth it! Laura Ramsey, Database Community Manager Friday Funny - Systems Community Top Content - Video: What Kind of Scalability is Better, Horizontal or Vertical?Rick Ramsey asks the question "Is Oracle's approach to large vertically scaled servers at odds with today's trend of combining lots and lots of small, low-cost servers systems with networking to build a cloud, or is it a better approach?" Michael Palmeter, Director of Solaris Product Management, and Renato Ribeiro, Director Product Management for SPARC Servers, discuss.Video: An Engineer Takes a Minute to Explain CloudBart Smaalders, long-time Oracle Solaris core engineer, takes a minute to explain cloud from a sysadmin point of view. ?Hands-On Lab: How to Deploy and Manage a Private IaaS Cloud Soup to nuts. This lab shows you how to set up and manage a private cloud with Oracle Enterprise Manager Cloud Control 12c in an Infrastructure as a service (IaaS) model. You will first configure the IaaS cloud as the cloud administrator and then deploy guest virtual machines (VMs) as a self-service user. Rick Ramsey, Systems Community Manager Friday Funny - Video: Drunk Airline Pilot - Dean Martin - Foster Brooks Java Community Top Content - Video: NightHacking Interview with James GoslingJames Gosling, the Father of Java, discusses robotics, Java and how to keep his autonomous WaveGliders in the ocean for weeks at a time. Live from Hawaii.  Video: Raspberry Pi Developer Challenge: Remote Controller A developer who knew nothing about Java Embedded or Raspberry Pi shows how he can now control a robot with his phone. The project was built during the Java Embedded Challenge for Raspberry Pi at JavaOne 2013.Java EE 7 Certification Survey - Participants NeededHelp us define how to server your training and certification needs for Java EE 7. Tori Wieldt, Java Community Manager Friday Funny - Programmers have a strong sensitivity to Yak's pheromone. Causes irresistible desire to shave said Yak. Thanks, @rickasaurus! To follow and take part in the conversation follow/like etc. at one or all of the resources below -  OTN TechBlog The Java Source Blog The OTN Garage Blog The OTN ArchBeat Blog @oracletechnet @java @OTN_Garage @OTNArchBeat @OracleDBDev OTN I Love Java OTN Garage OTN ArchBeat Oracle DB Dev OTN Java

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