JAMM | Another MasterMind : Implementation in Java | Learning library
kandi X-RAY | JAMM Summary
kandi X-RAY | JAMM Summary
Run Netbeans (testet on Netbeans IDE 7.3). Browse to the JAMM folder of this git repository. … Do what ever you want ;).
Support
Quality
Security
License
Reuse
Top functions reviewed by kandi - BETA
- Initialize the GUI components
- Add a new row to the game table
- Translates java util Color to a Color
- Initialize the color table
- Start the benchmark
- Test for genetic solver
- Parse the command line arguments
- Check the active game row
- Make a simple guess
- Generate a guess
- Checks if the row contains the double color
- Search for a color in an array
- Generates a random secret code
JAMM Key Features
JAMM Examples and Code Snippets
Community Discussions
Trending Discussions on JAMM
QUESTION
I have an application using Boot Strap running with cassandra 4.0, Cassandra java drive 4.11.1, spark 3.1.1 into ubuntu 20.4 with jdk 8_292 and python 3.6.
When I run a function that it call CQL by spark, the tomcat gave me the error bellow.
Stack trace:
...ANSWER
Answered 2021-May-25 at 23:23I openned two JIRA to understand this problem. See the links below:
QUESTION
I have a cluster of cassandra (v3.11.4) with 14 nodes and I wanna to add a new node. The machine has 256GB memory and I set heap size (max and min) to 64GB . But I cannot add a new node due to memory error! What is the exact problem and What I need to do?
The last line of logs are as follows:
...ANSWER
Answered 2020-Jun-14 at 13:49The error message says that the JVM failed to commit memory, because mmap syscall returned with the error code 12 (ENOMEM).
This typically happens when the process reaches one of the OS memory limits:
The number of memory mappings exceeded
vm.max_map_countsysctl limit. This is a quite common problem with Cassandra, since Cassandra tends to mmap thousands files, and the default limit is rather low - around 65K.How to check:
wc -l /proc//mapswhereis Java process ID.How to fix:
sudo sysctl vm.max_map_count=1000000Total amount of the process' virtual memory exceeded
RLIMIT_ASHow to check:
ulimit -v,cat /proc//status | grep VmHow to fix:
ulimit -v unlimitedbefore starting Cassandra in the same shell.Overcommit is disabled, and the overcommit ratio is too low.
How to check:
sysctl vm.overcommit_memory,sysctl vm.overcommit_ratio,cat /proc/meminfoHow to fix:
sudo sysctl vm.overcommit_memory=0
QUESTION
I'm working on a Codecademy project, Jammming, creating a playlist maker with the Spotify API. I've searched everything online, other repos, videos, and I still keep getting the mapping error. I'm not sure what's up? Any ideas?
Posted on github here: https://github.com/carriepresley/jammming
...ANSWER
Answered 2020-Nov-17 at 22:10try :
QUESTION
EDIT: Although yukim's workaround does work, I found that by downgrading to JDK 8u251 vs 8u261, the sigar lib works correctly.
- Windows 10 x64 Pro
- Cassandra 3.11.7
NOTE: I have JDK 11.0.7 as my main JDK, so I override JAVA_HOME and PATH in the batch file for Cassandra.
Opened admin prompt and...
java -version
...ANSWER
Answered 2020-Jul-29 at 01:05I think it is sigar-lib that cassandra uses that is causing the problem (especially on the recent JDK8).
It is not necessary to run cassandra, so you can comment out this line from cassandra-env.ps1 in conf directory: https://github.com/apache/cassandra/blob/cassandra-3.11.7/conf/cassandra-env.ps1#L357
QUESTION
Does the below INFO message that appears on server logs indicate that the node has run out of memory ?
INFO 15:08:37 JVM Arguments: [-Dorg.xerial.snappy.tempdir=/app/apigee/data/apigee-cassandra/data/tmp, -Dorg.xerial.snappy.tempdir=/app/apigee/data/apigee-cassandra/data/tmp, -ea, -javaagent:/app/apigee/apigee-cassandra-2.1.16-0.0.1123/bin/../lib/jamm-0.3.0.jar, -XX:+CMSClassUnloadingEnabled, -XX:+UseThreadPriorities, -XX:ThreadPriorityPolicy=42, -Xms8192M, -Xmx8192M, -Xmn1200M, -XX:+HeapDumpOnOutOfMemoryError, -Xss256k, -XX:StringTableSize=1000003, -XX:+UseParNewGC, -XX:+UseConcMarkSweepGC, -XX:+CMSParallelRemarkEnabled, -XX:SurvivorRatio=8, -XX:MaxTenuringThreshold=1, -XX:CMSInitiatingOccupancyFraction=75, -XX:+UseCMSInitiatingOccupancyOnly, -XX:+UseTLAB, -XX:CompileCommandFile=/app/apigee/apigee-cassandra-2.1.16-0.0.1123/bin/../conf/hotspot_compiler, -XX:CMSWaitDuration=10000, -XX:+CMSParallelInitialMarkEnabled, -XX:+CMSEdenChunksRecordAlways, -XX:CMSWaitDuration=10000, -Djava.net.preferIPv4Stack=true, -Dcom.sun.management.jmxremote.port=7199, -Dcom.sun.management.jmxremote.rmi.port=7199, -Dcom.sun.management.jmxremote.ssl=false, -Dcom.sun.management.jmxremote.authenticate=false, -Dcom.sun.management.jmxremote.password.file=/app/apigee/data/apigee-cassandra/jmxremote.password, -javaagent:/app/apigee/apigee-cassandra-2.1.16-0.0.1123/bin/../lib/jolokia-jvm-1.3.5-agent.jar=host=0.0.0.0, -Dlogback.configurationFile=logback.xml, -Dcassandra.logdir=/app/apigee/apigee-cassandra-2.1.16-0.0.1123/bin/../logs, -Dcassandra.storagedir=/app/apigee/apigee-cassandra-2.1.16-0.0.1123/bin/../data, -Dcassandra-foreground=yes]
This entry is being used by the Ops team to suggest that the node has run out of memory.
My belief is this is just an info message by a service, stating that the JVM arguments provided to it instructs it to create a dump of the heap if the service ran out of memory and that the appearance of this message itself does not indicate that the node has run out of memory.
Does that INFO entry mean I am running out memory?
UPDATE I tried to do some research and I found this https://docs.oracle.com/javase/7/docs/webnotes/tsg/TSG-VM/html/clopts.html
...ANSWER
Answered 2020-Jul-22 at 07:57This specific option means that JVM will generate heap dump if it encounters out of memory situation - this is very useful for understanding why OOM happened - for example, you may have too many tombstones in the memory, etc.
But all JVM options are applied to Cassandra as just another JVM-based product, so Oracle's documentation is applicable.
QUESTION
I'm in the final stages of the Jammming project working with Spotify API, trying to save a user playlist (and getting practice asking for help here... thank you!). The problem code: Spotify.savePlaylist
...ANSWER
Answered 2020-Jul-20 at 19:30What the error says is that you trying read id from undefined, not that id is undefined, so the variable you trying read id from, jsonResponse is undefined.
Take close look at your savePlaylist function, and notice that you dont return json from the response, what makes jsonResponse in next then in the chain undefined and that is where you are trying to read id from undefined variable. Add return before response.json() and try again.
The reason why you dont see any id property when console.log response is because the id is within the body of that response and the body is not shown there by console.log, console.log(response.json()) would probably yeld the parsed json response you're looking for and id would be within that object.
QUESTION
Been trying to build Apache Cassandra using Ant. The build is successful, but the Cassandra server won't start using bin\cassandra because of the error: Error opening zip file or JAR manifest missing : D:\cassandra\lib\jamm-0.3.2.
Here is the environment setup:
- JDK 8 bin directory added to PATH
- JAVA_HOME is set to the JDK 8 directory
- CASSANDRA_HOME is set to D:\cassandra, where I cloned the repo
- D:\cassandra\lib\jamm-0.3.2.jar exists
Just in case I tried recloning the repo in another directory, rebuilding, but same error.
Checking the output when building, I noticed warnings like this one, I don't know if it is relevant.
...ANSWER
Answered 2020-Apr-29 at 14:48I've seen this issue, too, when running Cassandra from my build directory.
What you'll want to do is to "deploy" your build (target) to a different directory, and set your CASSANDRA_HOME to that. Essentially, you'll want to emulate the how the "delivered" directory structure looks, ensuring that subdirs like bin/, conf/ and lib/ are at the same directory level.
Try that and see if it helps.
QUESTION
I've build a new cluster with cassandra 3.11.3, filled it with data from old cluster with cassandra 2.0.14 and few hours after switching application to this new cluster I've got memory errors:
...ANSWER
Answered 2019-May-14 at 21:125gb heaps (-Xmx5120M) are lower than the minimum recommended heap size of 8gb. While you can probably tune it to make it work the database is not designed with its defaults to run in that limited of a heap. Probably the fastest and most likely way to help is to set concurrent_reads and concurrent_writes to 8 or 4. Then concurrent_compactors and concurrent_validations (if more recent version) to 1.
If you set the -XX:+HeapDumpOnOutOfMemoryError and -XX:HeapDumpPath=/somewhere/writable then on the OOM it will dump the heap and you can open it up and see what is cause. If you get it you can post heap histogram (using jmap on the dump) and people may be able to give more direction - but it may require actually poking around with a tool like yourkit or MAT to know exact cause.
If thats a deadend you can use async profiler
QUESTION
I have two sets of tests, one that needs to be run with the JVM -javaagent set, and one that needs it unset. I am using Groups to run on separate JVMs, and I can see both java processes start. Using jps -lvm I can see no JVMs are running with the -javaagent flag.
build.sbt:
ANSWER
Answered 2019-Apr-14 at 20:25Try scoping testGrouping by Test configuration like so
QUESTION
I'd like to click on the following link but it's not working:
...ANSWER
Answered 2018-Nov-06 at 09:22Try:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install JAMM
You can use JAMM like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the JAMM component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
Support
Reuse Trending Solutions
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items
Find more librariesStay Updated
Subscribe to our newsletter for trending solutions and developer bootcamps
Share this Page
