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Cassandra: Writes after setting a column to null are lost randomly. Is this a bug, or I am doing something wrong?


Cassandra: Writes after setting a column to null are lost randomly. Is this a bug, or I am doing something wrong?

By : Hazem Tawfik El-kili
Date : November 20 2020, 01:01 AM
With these it helps This appears to be an issue where a row is updated right after it's created. If you were to wait a small period of time after the second update, you would get the correct value, that does seem to be an issue, but perhaps only noticeable when running cassandra locally.
I suspect this is a cassandra issue, though it seems to be currently resolved on trunk and cassandra-2.1 branches. I can reproduce against 1.2.19, 2.0.11, and 2.1.2, but I cannot reproduce against trunk or cassandra-2.1. I can't seem to pinpoint the exact change based on the changelog.
code :


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GStreamer XOverlay lost after setting the Playbin state to NULL or READY

GStreamer XOverlay lost after setting the Playbin state to NULL or READY


By : user3820998
Date : March 29 2020, 07:55 AM
seems to work fine The solution is to prevent the videosink from changing its state. Credit to Stefan Sauer from the gstreamer-devel mailing list.
code :
playBin.VideoSink.SetLockedState(true);
playBin.SetState(Gst.State.Ready);
playBin.Uri = @"file:///" + newFileName.Replace('\\', '/');
playBin.SetState(Gst.State.Paused);
playBin.VideoSink.SetLockedState(false);
Setting cassandra column as set<text> gives InvalidRequestException

Setting cassandra column as set<text> gives InvalidRequestException


By : jaagher
Date : March 29 2020, 07:55 AM
wish helps you I am new to the cassandra world. I created a cassandra table using cqlsh like the following: ,
What is it that I am doing wrong?
code :
CREATE TABLE "userRecommendations" (
  uid text PRIMARY KEY,
  app set<text>
) WITH COMPACT STORAGE;
OpenCsv writes wrong column names with BeanToCsv + HeaderColumnNameTranslateMappingStrategy

OpenCsv writes wrong column names with BeanToCsv + HeaderColumnNameTranslateMappingStrategy


By : Parnay Kumar Mishra
Date : March 29 2020, 07:55 AM
it should still fix some issue Looking at the source code of BeanToCsv, the processHeader(...) method does nothing with the supplied headers. Your only option is to create a custom strategy ( to avoid CSVReader ) and a custom BeanToCsv as below
code :
 

public class CustomBean {
   ...
   public static void main(String[] args) {
     ...
     HeaderColumnNameTranslateMappingStrategy strategy = new CustomStrategy<CustomBean>();
     strategy.setType(CustomBean.class);
     strategy.setColumnMapping(mapping);
     ...

     BeanToCsv bean = new CustomBeanToCsv<CustomBean>();
     ...
   }

   static class CustomStrategy<T> extends HeaderColumnNameTranslateMappingStrategy {

    @Override
    public void setColumnMapping(Map columnMapping) {
        super.setColumnMapping(columnMapping);
        header = new String[columnMapping.size()];
        int i = 0;
        for (Map.Entry entry : columnMapping.entrySet()) {
            header[i] = entry.getKey().toUpperCase();
            i++;
        }
    }

     public String[] getHeader() {
         return header;
     }
   }

   static class CustomBeanToCsv<T> extends BeanToCsv {
     @Override
     protected String[] processHeader(MappingStrategy mapper) throws IntrospectionException {
         if (mapper instanceof CustomStrategy) {
             return ((CustomStrategy) mapper).getHeader();
         } else {
             return super.processHeader(mapper);
         }
     }
   }
}

 
FileOutputStream randomly writes null

FileOutputStream randomly writes null


By : Mary Jane
Date : March 29 2020, 07:55 AM
wish helps you In this line: prop.setProperty("integer", "" + data[0]); you have set the propertie key to "integer".
But when you get that property, you are trying to get it using another key "clicks".
code :
Error: java.lang.ExceptionInInitializerError 
Caused by: java.lang.NumberFormatException: null
data[0] = prop.getProperty("integer");
intData[i] = Integer.parseInt(data[i]) + 0;//i is 0
try{
    intData[i] = Integer.parseInt(data[i]) + 0;
}catch(NumberFormatException e){
    System.out.println("its null");//anything you want
}
Game2 g= new Game2();
g.setVisible(true);
g.loopedTasks();
There is no rollback in Cassandra, then how does Cassandra remove failed writes?

There is no rollback in Cassandra, then how does Cassandra remove failed writes?


By : Afjal Ali
Date : March 29 2020, 07:55 AM
around this issue It doesn't. Cassandra will try to replicate the data on each write operation and your application will be notified if the consistency level couldn't be met. But Cassandra doesn't rollback writes.
What you probably want to do in such cases is to use a higher CL for your reads as well. E.g. using CL QUORUM will read the data from both nodes and will automatically repair data in case its missing on one of the nodes.
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