I successfully installed hadoop version 3.2.2 and have Java version 8 (JDK 1.8.0) and followed the tutorial here: https://www.youtube.com/watch?v=g7Qpnmi0Q-s
Here are my executions when running Hadoop in command prompt here:
The issue here is that hadoop (version 3.2.2) is taking way too long to load after successfully installing it in my local drive exactly like in the tutorial I followed above. I don't receive any errors or shutdown terminals after running start-dfs.cmd and start-yarn.cmd.
I can send how I set up my environment variables but I believe that I followed exactly that as described in the tutorial. Here is my setup:
Is there a solution to solve this issue?
I tried other StackOverflow posts but none of them specified how to tackle my issue with not loading Hadoop quickly. It actually never finishes loading even without errors or shutdowns.
Related
I am getting below error while starting my cassandra setup in my machine windows 10.
>>cassandra.bat -f
WARNING! Powershell script execution unavailable.
Please use 'powershell Set-ExecutionPolicy Unrestricted'
on this user-account to run cassandra with fully featured
functionality on this platform.
Starting with legacy startup options
Starting Cassandra Server
Error: Could not find or load main class org.apache.cassandra.service.CassandraDaemon
Find below more details :
apache-cassandra-3.11.4
java version "1.8.0_45"
Python 3.8.1
I have added CASSANDRA_HOME as well in the environment variable.
I tried all possible solution got it from google/stackoverflow but nothing worked.
Previously i was using 3.11.5 but got some error so i got to know that i should use 3.11.4 so i am using it but even this version not working. Find the link for the same.
Please help
I've recently installed and tried to use Grakn.ai for visualization. Following the instructions on grakn.ai's website, I ran into the following problem when trying to run:
\grakn-dist-0.15.0>.\bin\grakn.sh start
in Windows 10 command prompt, 64 bit, the following lines are displayed before exiting:
Starting redis
Cassandra already running
Starting engine.Error: Could not find or load main class
ai.grakn.engine.GraknEngineServer
Error: Could not find or load main class ai.grakn.client.Client
.Error: Could not find or load main class ai.grakn.client.Client
.Error: Could not find or load main class ai.grakn.client.Client
I have also attempted to add JAVA_HOME into System Variables, however this is to no avail. (I noticed that JAVA_HOME did not exist when I initially looked for it and so I had to manually create the variable and set jdk path - perhaps this implies some issue)
Thank you very much for your time and I'd be very grateful for any help.
You can start by checking the version of the jdk you are using. Grakn requires Oracle JDK 8 to be specific.
Also note, that Grakn does not yet officially support Windows because of Cassandra 2.1 being beta on windows. However you can get it working on windows. This page suggests how you can achieve it. I would recommend going with the docker version as it is simpler to work with.
i noticed that i can not deploy a JavaFX application with javapackager two times without closing the IDE / commandline. I want to create a native image of my application on a Windows 10 machine.
After the second deploy I get Exception: java.io.IOException: Access denied. After closing and reopen it works for one deploy again.
I can reproduce this Issue with Netbeans (create a JavaFX Application, enable Native Packaging, and then package as "image only") on 3 different PCs with Oracle JDK 8u121 and Windows 10.
I also get this error in a gradle project in eclipse trying to deploy it with the official ant task (https://docs.oracle.com/javase/8/docs/technotes/guides/deploy/javafx_ant_tasks.html)
Also tried it on an Ubuntu VM and OpenJDK. There is no problem.
Can somebody of you reproduce this error on Windows 10, too?
Is there a workaround or offical bug report for this?
Thanks in advance
Joey
This is a known problem, the cause is a file-handle leak and already got reported by me: https://bugs.openjdk.java.net/browse/JDK-8148717 It is only windows-specific, as the file-locking on the JRE-folder works on windows-systems, other OS don't lock.
This bug got worked around inside the JavaFX-Gradle-Plugin, as gradle starts daemons, which hold up the JVM, the JavaFX-Maven-Plugin didn't need it, because the JVM is always closed.
Disclaimer: I'm the creator of the JavaFX-Gradle-Plugin and maintainer of the JavaFX-Maven-Plugin.
PREFACE! I know similar questions have been asked a million times. I have read MANY hundreds of the previous questions and still cannot find my answer.
I am working on a raspberry pi and trying to run a Java application that is packaged in a Jar file. It was working fine before I installed the latest Java 1.8_111. I downgraded and it still didn't work. I then wiped my pi to defaults and it is still not working.
The current Java version is 1.8.0_65. I have decided that the java version is irrelevant by installing multiple different versions with the same result. When I installed a different version no other version was present to cause conflicts.
If I run the jar by simply doing java -jar KitchenScr.jar I get the following error:
Error: Could not find or load main class com.javafx.main.Main
If I run the jar from the supplied shell script(below). I get the following error.
Script
#!/bin/sh
DIRNAME=`dirname $0`
CP=$DIRNAME/KitchenScr.jar
# start uniCenta oPOS
java -cp $CP uk.chromis.kitchenscr.KitchenScr
Error
Error: Could not find or load main class uk.chromis.kitchenscr.KitchenScr
If I left anything out please let me know.
This was a simple issue that was staring me in the face.
Error: Could not find or load main class com.javafx.main.Main
Oracle stopped releasing JavaFX for ARM around Update 30 or something. It worked initially when I first bought my pi, but not after I installed a new OS because a newer version of Java was running.
Downgrade Java or add relevent ARM libraries for JavaFX.
mine worked. CP=$DIRNAME/KitchenScr.jar, I changed the capital letters of kitchenscr.jar to CP=$DIRNAME/kitchenscr.jar
I am running Cassandra 3.7 on an Ubuntu Server 16.04 LTS 32bit machine that I'm re-purposing from storage. I managed to properly configure the JVM to operate within the 32 bit environment. Nodetool status works fine. But I am having a hard time getting CQLSH to work. I end up with the following error:
('Unable to connect to any servers', {'127.0.0.1': ProtocolError("cql_version '3.4.2' is not supported by remote (w/ native protocol). Supported versions: [u'3.4.0']",)})
Obviously there is some version conflict here but I'm confused as to why and how to fix it. I had a previous 3.0 install of Cassandra that I configured cassanda-env.sh to properly start the JVM. I kept that .sh file when I installed up to 3.7. I updated cassandra.yaml with the new install.
So my question here is: does Cassandra 3.7 support CQL 3.4.2? If not then why does it appear to ship with it? If it does not, what do I need to do to downgrade to CQL 3.4.0? If it does support it and my configuration files are wrong then what's the error and how do I fix it? Or, is there another configuration that I'm completely missing here?
Here are my current configurations:
cassandra-env.sh: https://www.dropbox.com/s/dcs99hgry5behqd/cassandra-env.sh?dl=0
cassandra.yaml:https://www.dropbox.com/s/boi8bh7gin0390f/cassandra.yaml?dl=0
Any assistance greatly appreciated.
EDIT: Figured out, with the help of the first answer, that I had an older instance of the server running. I couldn't get it to start with the correct version...so then I deleted cassandra from /etc/init.d and now I can't get the debian package to automatically register the service.
EDIT2: Downloaded cassandra script from git repo and now cassandra will start again after rebooting. Now cassandra -v shows me:
3.7
Which what I wanted to see and solved my issue pertaining to the version conflict. But now unfortunately I see a new error:
Connection error: ('Unable to connect to any servers', {'127.0.0.1': TypeError('ref() does not take keyword arguments',)})
This problem is addressed in: cqlsh connection error: 'ref() does not take keyword arguments'
It looks like you're running the 3.7 cqlsh against an older server instance. First, be sure you are actually running Cassandra 3.7 (you can probably just check the jar path or look in the logs).
If you want to connect using the advertised cql_version there is a command line option:
https://github.com/apache/cassandra/blob/cassandra-3.7/bin/cqlsh.py#L222
select release_version, cql_version from system.local;
(or just look at the cqlsh welcome header) to see what these parameters are.