reading saved cache /cassandra/saved_caches/system-IndexInfo-KeyCache
Exception encountered during startup.
java.lang.NegativeArraySizeException at 
org.apache.cassandra.db.ColumnFamilyStore.readSavedCache(ColumnFamilyStore.java:280)

I was getting this error after upgrading from 0.7.0 to 0.7.4 and couldn’t restart cassandra. I ended up removing the files in my saved_caches directory and this fixed my problem.

A

You can enable this by changing the following setting in your httpd.conf file:

AllowOverride None
to
AllowOverride All

A

People ask why I use it so much. Knowing the state of a box is important to being able to prevent and diagnose problems and I find a lot of issues with ps.

A lot of times, I’ll find new issues just because I randomly did a ps and noticed something weird.

It’s one of my first tools in debugging system level issues.

For example, I recently had a problem where Nagios was not saving acknowledgments, and configuration changes were getting reset.

Logged on to our monitoring box, ps faux:

Dec02 183:02 nagios
15:58 0:22 nagios

.. oh 2 instances running, that’s weird. Problem identified.

A

nvcc -deviceemu main.cu

In 3.0, this was changed such that you should link against cudartemu instead of cudart
In 3.1, emulation was removed.

So if want device emulation, you need to use version 3.0 or earlier.

A

ERROR 2013 (HY000): Lost connection to MySQL server during query

Was happening on 5.1.31. Pretty small table ~2m rows, so ended up just dumping the data and reimporting it and it fixed the problem. This was only happening on the production box, not in dev.

A

ERROR 1034 (HY000): Incorrect key file for table ‘frogs’

Moving my tmpdir to another drive with more space and rerunning the alter table solved the issue.

A

mysubdomain.thankyou

And an action:

def thankyou
end


Forgot the sub-domain and a little _url on the end of a link inside my controller:

redirect_to thankyou

debugging ensued….

   server {
     listen 80;
     server_name monkey;
     server_name_in_redirect off;

     rewrite ^/(.*) https://$host/$1 permanent;
   }

Additional reading materials:
Nginx Core
Nginx Rewrite

Mail.deliver do
  from 'blah@example.com'
  to 'jojo@example.com'
  subject "secret file"

  text_part do
    body "Please see attached file."
  end

  add_file ({:filename => "myfile.txt"})
end

When I didn’t have my body inside of a text_part, it placed an encoded version of the binary file into the body of the email, which isn’t quite what I wanted.

A

No such file or directory - getcwd

This happens if you delete your current directory, maybe you were in a gem directory and uninstalled that gem for example..

A