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AWS Difference between a snapshot and AMI
... of specific EBS volume, it might be any volume (Root volume, data volume, etc.)
AMI (Amazon Machine Image) is a backup of Entire EC2 instance. For example, with proper configuration it's possible to create AMI which includes multiple EBS volumes.
Now, it might sound confusing, but they are both s...
Shards and replicas in Elasticsearch
...
An index is broken into shards in order to distribute them and scale.
Replicas are copies of the shards and provide reliability if a node is lost. There is often confusion in this number because replica count == 1 means the cluster must have the main and a ...
PyLint “Unable to import” error - how to set PYTHONPATH?
...lint's, though I haven't used that) is:
topdir\
__init__.py
functions_etc.py
subdir\
__init__.py
other_functions.py
This is how the python interpreter is aware of the module without reference to the current directory, so if pylint is running from its own absolute path it will be abl...
Error starting jboss server
... JBoss config is relying on reflection to return constructors in a certain order, and in some cases this order is different, causing the exception. Did you change your JRE version when you reinstalled, say from 1.6.0_17 to _18?
Anyway, the workaround is described in the JIRA issue, and also here. ...
Error when installing windows SDK 7.1
...ll the newer version
of the Visual C++ 2010 Redistributable products, in order to restore
the Visual C++ 2010 Redistributable products to their original state.
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How do you maintain development code and production code? [closed]
...here you merge only feature branch to dev, then if selected, to master, in order to be able to drop easily feature branches not ready for the next release) is implemented in the Git repo itself, with the gitworkflow (one word, illustrated here).
See more at rocketraman/gitworkflow. The history of do...
What's wrong with using == to compare floats in Java?
...t there is no exact way to represent most decimal numbers like .1, .2, .3, etc. All you can do is approximate in binary. The system does a little fudge-rounding when the numbers print so that it displays .1 instead of .10000000000001 or .999999999999 (which are probably just as close to the stored...
jQuery UI “ $(”#datepicker“).datepicker is not a function”
...datepicker();
Also make sure your javascript includes are in the correct order so the jquery core library is defined before the jquery.ui. I've had that cause issues.
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Python class inherits object
...lets you customize how new class instances are created.
Method resolution order (MRO): in what order the base classes of a class will be searched when trying to resolve which method to call.
Related to MRO, super calls. Also see, super() considered super.
If you don't inherit from object, forget...
Logging in Scala
...ries have been some wrappers around a Java logging framework (slf4j, log4j etc), but as of March 2015, the surviving log libraries are all slf4j. These log libraries provide some sort of log object to which you can call info(...), debug(...), etc. I'm not a big fan of slf4j, but it now seems to be t...