Migrating TB HBase datasets across datacenters
Practical notes on migrating a 2TB HBase cluster from Rackspace to AWS with minimal downtime using CopyTable.
note
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Recursive queries in PostgreSQL
Walking tree-structured data in PostgreSQL.
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Mean Absolute Error
The average absolute difference between predictions and labels — less sensitive to outliers than RMSE.
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Root Mean-Squared Error
A regression metric that penalises large errors.
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Hyperplane
a subspace where the dimension is one less than the ambient space
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Principal Component Analysis
a technique for reducing the dimensionality of data
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Dijkstra's Shortest Path Algorithm
An elegant algorithm for finding the shortest path between nodes in a graph.
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Packet capturing in parallel with Ansible
An Ansible playbook for running tcpdump in parallel across many servers and collecting the captures.
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fork System Call
A system call that duplicates the current process, creating a parent and child that continue from the same point.
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Orphan Processes
A child process whose parent has exited.