Database Reference
In-Depth Information
The second type of log, however, is the application log. It's a file created by an
application that is executing and using a logging system. These are managed by
software developers to record what is going on, for compliance reasons, and to
help them debug issues.
There is another type of log too, namely the well log. This happens when a
well-logging tool is pulled up the oil well and it is recording measurements such as
resistivity or magnetic resonance. These are later used to analyze the formation of oil
deposits and ind them. This subject is dear to my heart, because I have written a topic
on this,
Image Processing in Well Log Analysis
, and it has recently been republished.
To summarize, there are vast varieties of time series data, and each one of them is
important in its own right. Each poses a specific interesting challenge when HBase
is used to store this type of data. Therefore, we will discuss the following areas that
relate to time series data:
• Using time-based keys
• Avoiding region hotspotting
• Tall and narrow rows versus wide rows
• OpenTSDB principles
