DataStax Support Forums » Tag: java

DataStax Support Forums » Tag: java - Recent Posts http://www.datastax.com/support-forums/tags/java Software, Support, and Training for Apache Cassandra en-US Thu, 23 May 2013 16:06:08 +0000 http://bbpress.org/?v=1.0.3 <![CDATA[Search]]> q http://www.datastax.com/support-forums/search.php nickmbailey on "Datastax Windows install hijacks Java and Python" http://www.datastax.com/support-forums/topic/datastax-windows-install-hijacks-java-and-python#post-4799 Thu, 02 Aug 2012 20:06:49 +0000 nickmbailey 4799@http://www.datastax.com/support-forums/ Marek, We appreciate the feedback. All of the points you bring up are valid, and we have plans to have the installer address them in the future. Regarding a workaround, unfortunately there is no way to prevent the installer from modifying those environment variables. You shoud however, be able to revert the changes made there, and still have OpsCenter work, if a few modifications are made to the opscenter start up scripts. We will verify what changes need to be made and that everything works correctly in that situation and get back to you soon. -Nick p0pgun on "Help with batch_mutate and composite keys" http://www.datastax.com/support-forums/topic/help-with-batch_mutate-and-composite-keys#post-4479 Tue, 31 Jul 2012 22:44:11 +0000 p0pgun 4479@http://www.datastax.com/support-forums/ Hi Leonid. I'm also fairly new to Cassandra (~3 months), but this is an error I've ran into several times when programmatically working with composite keys. Your problem is that composite keys in cassandra are not simply concatenation of ByteBuffer of the components; cassandra composite keys use a specific format for the byte buffer. Refer to CompositeTool.java here: <a href="http://www.jointhegrid.com/highperfcassandra/" rel="nofollow">http://www.jointhegrid.com/highperfcassandra/</a> marek on "Datastax Windows install hijacks Java and Python" http://www.datastax.com/support-forums/topic/datastax-windows-install-hijacks-java-and-python#post-4380 Tue, 31 Jul 2012 06:15:01 +0000 marek 4380@http://www.datastax.com/support-forums/ Hi! I installed the 32-bit version of the Datastax Community edition and after that all sorts of strange things started happening. Turns out that during the install, it hijacked my Java and Python installs and redirected them to its own private versions, contaminated my JAVA_HOME and PYTHONPATH (referring them to its private installs of Java and Python) and prepended itself to the system PATH. The PATH thing I can ALMOST forgive, as there are a gazillion other software packages that do the same and it has become an irritating modus operandi. What I DO object to, however, is hijacking my Python (version 3.x, instead of 2.whatever the Datastax CE uses) and Java installations (WTF is the point in keeping my Java up to date, allowing its stupid updater to run and pester me continuously when suddenly somebody comes along and voids all that "effort"?). Politely put, this is BS. The installer, of course, did not ASK nor WARN me of this. All that it was concerned about was, if I wanted to start the Datastax services on boot. A similar topic was already at <a href="http://www.datastax.com/support-forums/topic/datastax-community-windows-installer-eclipse" rel="nofollow">http://www.datastax.com/support-forums/topic/datastax-community-windows-installer-eclipse</a> Now, to end this rant in a constructive way: Is there a way to kindly request (or force) the Datastax CE (or its installer) to not contaminate my (development) system with its "business" or is the only workaround to install it in a separate (or virtual) machine which it can keep all for itself? lilyevsky on "Help with batch_mutate and composite keys" http://www.datastax.com/support-forums/topic/help-with-batch_mutate-and-composite-keys#post-2719 Thu, 05 Jul 2012 18:22:47 +0000 lilyevsky 2719@http://www.datastax.com/support-forums/ My table has a composite key (let say, two ascii elements), and I am trying to use batch_mutate for the bulk load. The argument for the method, mutation_map, is a map where the key is the key to the column family. Since my key is composite, I created it by concatenating ByteBuffer representations of the two components. When i am trying to execute the batch_mutate method, I am getting exception: Exception in thread "main" InvalidRequestException(why:Not enough bytes to read value of component 0) at org.apache.cassandra.thrift.Cassandra$batch_mutate_result.read(Cassandra.java:20253) at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:78) at org.apache.cassandra.thrift.Cassandra$Client.recv_batch_mutate(Cassandra.java:922) at org.apache.cassandra.thrift.Cassandra$Client.batch_mutate(Cassandra.java:908) at com.moon.cassandra.CassandraAccess.executeBatch(CassandraAccess.java:256) at com.moon.cql.BatchTest.main(BatchTest.java:40) What does this mean? What am I doing wrong? Is it even possible to have composite key and use batch_mutate? Thanks, Leonid Anonymous on "Cassandra Java Client" http://www.datastax.com/support-forums/topic/cassandra-java-client#post-1753 Tue, 24 Apr 2012 14:38:38 +0000 Anonymous 1753@http://www.datastax.com/support-forums/ ok, thanks a lot. Anonymous on "Cassandra Java Client" http://www.datastax.com/support-forums/topic/cassandra-java-client#post-1752 Tue, 24 Apr 2012 13:53:05 +0000 Anonymous 1752@http://www.datastax.com/support-forums/ Hector and Astyanax are more low-level but also probably more feature rich. Additionally they are quite similar, because Astyanax is refactored Hector. Kundera is a different kind of a beast - it maps your cassandra model directly to Java objects by annotations. If you know JPA, it may be the most straighforward choice. However, I'd warn you against building your data model as you'd build a relational model - the philosophies behind those two types of database systems (relational and noSQL) are quite different. Anonymous on "Cassandra Java Client" http://www.datastax.com/support-forums/topic/cassandra-java-client#post-1751 Tue, 24 Apr 2012 13:21:34 +0000 Anonymous 1751@http://www.datastax.com/support-forums/ ok,Thanks. I've a project with cassandra.i've to choose one java client.So when i choose one, my responsible will ask me why i chose Hector but not Astyanax ,for example.Personnally, i can't explain, i just saw on forums that Hector is the most used so i chose it... Anonymous on "Cassandra Java Client" http://www.datastax.com/support-forums/topic/cassandra-java-client#post-1750 Tue, 24 Apr 2012 13:01:44 +0000 Anonymous 1750@http://www.datastax.com/support-forums/ The term "best java client" is pretty blurred. I cannot point to one which is the best, because there is no single criterion of choice. It very much depends on what are your requirements, e.g. 1. Should it be easy to install / learn? 2. Should it provide complete support for all the underlying features? 3. Should it expose a low-level API (thrift)? 4. Do you care about particular additional features or services, e.g pooling / failover? 5. ... You have to make a choice based on your personal requirements. But if you are only learning now, I'd recommend taking just the one which looks easiest to you. Anonymous on "Cassandra Java Client" http://www.datastax.com/support-forums/topic/cassandra-java-client#post-1749 Tue, 24 Apr 2012 09:08:28 +0000 Anonymous 1749@http://www.datastax.com/support-forums/ Hi everybody, I'm just discovering Cassaandra.And now for his java client i would like to know your point about the "best" java client for Cassandra.Hector, Astyanax or Kundera ? Thanks a lot. Anonymous on "Exception when running Pig MapReduce job written in Java" http://www.datastax.com/support-forums/topic/exception-when-running-pig-mapreduce-job-written-in-java#post-1747 Mon, 23 Apr 2012 23:38:54 +0000 Anonymous 1747@http://www.datastax.com/support-forums/ You need to run with using ./bin/dse script otherwise you won't have "dse.job.tracker" variable (and probably other important ones) set. Anonymous on "Exception when running Pig MapReduce job written in Java" http://www.datastax.com/support-forums/topic/exception-when-running-pig-mapreduce-job-written-in-java#post-1654 Tue, 17 Apr 2012 16:39:54 +0000 Anonymous 1654@http://www.datastax.com/support-forums/ From the command-line on one of the nodes in the cluster. This is the command I am running: java -cp .:./bin:/opt/datastax/dse-2.0-1/resources/hadoop/conf/:/opt/datastax/dse-2.0-1/resources/pig/pig-0.8.3.jar:/opt/datastax/dse-2.0-1/resources/pig/lib/*:/opt/datastax/dse-2.0-1/resources/hadoop/lib/*:/opt/datastax/dse-2.0-1/resources/hadoop/*:/opt/datastax/dse-2.0-1/resources/dse/lib/*:/opt/datastax/dse-2.0-1/lib/dse-2.0-1.jar:/opt/datastax/dse-2.0-1/resources/cassandra/lib/*:/opt/datastax/dse-2.0-1/resources/cassandra/conf/:/opt/datastax/dse-2.0-1/resources/dse/conf/ idmapreduce tjake on "Exception when running Pig MapReduce job written in Java" http://www.datastax.com/support-forums/topic/exception-when-running-pig-mapreduce-job-written-in-java#post-1653 Tue, 17 Apr 2012 16:26:01 +0000 tjake 1653@http://www.datastax.com/support-forums/ How are you running this job? Anonymous on "Exception when running Pig MapReduce job written in Java" http://www.datastax.com/support-forums/topic/exception-when-running-pig-mapreduce-job-written-in-java#post-1652 Tue, 17 Apr 2012 16:24:36 +0000 Anonymous 1652@http://www.datastax.com/support-forums/ I am trying to run an example Pig MapReduce job written in Java against a multi-node DataStax Enterprise cluster, but I am getting an exception. The example code I am using is found here, in the "Mapreduce Mode" section: <a href="http://pig.apache.org/docs/r0.9.1/cont.html" rel="nofollow">http://pig.apache.org/docs/r0.9.1/cont.html</a>. The exception I am getting is: org.apache.pig.PigException: ERROR 1002: Unable to store alias B at org.apache.pig.PigServer.storeEx(PigServer.java:889) at org.apache.pig.PigServer.store(PigServer.java:827) at org.apache.pig.PigServer.store(PigServer.java:795) at idmapreduce.runIdQuery(idmapreduce.java:16) at idmapreduce.main(idmapreduce.java:7) Caused by: org.apache.pig.backend.executionengine.ExecException: ERROR 2043: Unexpected error during execution. at org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.execute(HExecutionEngine.java:403) at org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1209) at org.apache.pig.PigServer.storeEx(PigServer.java:885) ... 4 more Caused by: java.lang.IllegalArgumentException: Does not contain a valid host:port authority: ${dse.job.tracker}:50020 at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:170) at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:151) at org.apache.hadoop.mapred.JobTracker.getAddress(JobTracker.java:2567) at org.apache.hadoop.mapred.JobClient.init(JobClient.java:474) at org.apache.hadoop.mapred.JobClient.<init>(JobClient.java:457) at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher.launchPig(MapReduceLauncher.java:122) at org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.execute(HExecutionEngine.java:378) ... 6 more I think the problem has to do with this line: Caused by: java.lang.IllegalArgumentException: Does not contain a valid host:port authority: ${dse.job.tracker}:50020 but I don't know what it means exactly. Are there some configurations I could be missing in the setup? mbulman on "Cannot get OpsCenter to install ... please assist" http://www.datastax.com/support-forums/topic/cannot-get-opscenter-to-install-please-assist#post-159 Wed, 15 Jun 2011 16:53:37 +0000 mbulman 159@http://www.datastax.com/support-forums/ This is most likely do to java not being install by yum, so it doesn't know you have it. You can verify by running <code>yum list installed | grep java</code> . If you'll notice, the line where you try to yum install openjdk is erroring because that url isn't a valid package name. <code>yum install java</code> should do the trick for you. TheSaint on "Cannot get OpsCenter to install ... please assist" http://www.datastax.com/support-forums/topic/cannot-get-opscenter-to-install-please-assist#post-158 Wed, 15 Jun 2011 16:43:25 +0000 TheSaint 158@http://www.datastax.com/support-forums/ Trying to eval this product asap for recommendation, so not feeling good about the install issues/process. Keeps getting the following error however java is installed. "Error: Missing Dependency: java >= 1.6.0 is needed by package opscenter-free" OS Version: =========== [root@islapadua tmp]# cat /etc/redhat-release Red Hat Enterprise Linux Server release 5 (Tikanga) Java: ===== [root@islapadua tmp]# java -version java version "1.6.0_26" Java(TM) SE Runtime Environment (build 1.6.0_26-b03) Java HotSpot(TM) Client VM (build 20.1-b02, mixed mode, sharing) Install Output: =============== [root@islapadua tmp]# yum install <a href="http://download.fedora.redhat.com/pub/epel/5/i386/openjdk1.6.rpm" rel="nofollow">http://download.fedora.redhat.com/pub/epel/5/i386/openjdk1.6.rpm</a> Loading "rhnplugin" plugin Loading "installonlyn" plugin This system is not registered with RHN. RHN support will be disabled. Setting up Install Process Setting up repositories epel 100% |=========================| 3.7 kB 00:00 opscenter 100% |=========================| 951 B 00:00 Reading repository metadata in from local files Parsing package install arguments No Match for argument: <a href="http://download.fedora.redhat.com/pub/epel/5/i386/openjdk1.6.rpm" rel="nofollow">http://download.fedora.redhat.com/pub/epel/5/i386/openjdk1.6.rpm</a> Nothing to do [root@islapadua tmp]# sudo rpm -Uvh <a href="http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5.4.noarch.rpm" rel="nofollow">http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5.4.noarch.rpm</a> Retrieving <a href="http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5.4.noarch.rpm" rel="nofollow">http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5.4.noarch.rpm</a> error: skipping <a href="http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5.4.noarch.rpm" rel="nofollow">http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5.4.noarch.rpm</a> - transfer failed - Unknown or unexpected error warning: u 0x84e9c78 ctrl 0x8a919c8 nrefs != 0 (download.fedora.redhat.com http) [root@islapadua tmp]# sudo yum install opscenter-free Loading "rhnplugin" plugin Loading "installonlyn" plugin This system is not registered with RHN. RHN support will be disabled. Setting up Install Process Setting up repositories Reading repository metadata in from local files Parsing package install arguments Resolving Dependencies --> Populating transaction set with selected packages. Please wait. ---> Package opscenter-free.noarch 0:1.1.1-2 set to be updated --> Running transaction check --> Processing Dependency: python26-zope.interface >= 3.3.0 for package: opscenter-free --> Processing Dependency: python26 for package: opscenter-free --> Processing Dependency: python26-morbid >= 0.8.7.3 for package: opscenter-free --> Processing Dependency: python26-routes >= 1.12.3 for package: opscenter-free --> Processing Dependency: python26-twisted >= 10.2.0 for package: opscenter-free --> Processing Dependency: python26-telephus >= 0.8.0~beta1 for package: opscenter-free --> Processing Dependency: python26-mimeparse >= 0.1.3 for package: opscenter-free --> Processing Dependency: java >= 1.6.0 for package: opscenter-free --> Processing Dependency: python26-thrift >= 0.5.0 for package: opscenter-free --> Processing Dependency: python26-OpenSSL >= 0.11 for package: opscenter-free --> Processing Dependency: python26-orbited >= 0.7.10 for package: opscenter-free --> Restarting Dependency Resolution with new changes. --> Populating transaction set with selected packages. Please wait. ---> Package python26-morbid.noarch 0:0.8.7.3-1 set to be updated ---> Package python26-thrift.i386 0:0.5.0-1 set to be updated ---> Package python26-orbited.noarch 0:0.7.10-1 set to be updated ---> Package python26-mimeparse.noarch 0:0.1.3-1 set to be updated ---> Package python26-zope.interface.i386 0:3.3.0-1 set to be updated ---> Package python26-twisted.i386 0:10.2.0-1 set to be updated ---> Package python26-OpenSSL.i386 0:0.11-1 set to be updated ---> Package python26-routes.noarch 0:1.12.3-1 set to be updated ---> Package python26-telephus.noarch 0:0.8.0~beta1-1 set to be updated ---> Package python26.i386 0:2.6.5-6.el5 set to be updated --> Running transaction check --> Processing Dependency: python26-simplejson for package: python26-morbid --> Processing Dependency: libffi.so.5 for package: python26 --> Processing Dependency: python26-stomper for package: python26-morbid --> Processing Dependency: libpython2.6.so.1.0 for package: python26 --> Processing Dependency: libpython2.6.so.1.0 for package: python26-zope.interface --> Processing Dependency: libpython2.6.so.1.0 for package: python26-OpenSSL --> Processing Dependency: java >= 1.6.0 for package: opscenter-free --> Processing Dependency: libpython2.6.so.1.0 for package: python26-thrift --> Restarting Dependency Resolution with new changes. --> Populating transaction set with selected packages. Please wait. ---> Package python26-libs.i386 0:2.6.5-6.el5 set to be updated ---> Package python26-stomper.noarch 0:0.2.4-1 set to be updated ---> Package python26-simplejson.i386 0:2.1.1-1.el5 set to be updated ---> Package libffi.i386 0:3.0.5-1.el5 set to be updated --> Running transaction check --> Processing Dependency: java >= 1.6.0 for package: opscenter-free --> Finished Dependency Resolution Error: Missing Dependency: java >= 1.6.0 is needed by package opscenter-free