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What raid devices available in config:
cat /etc/mdadm/mdadm.conf

Get details on a raid array:
sudo mdadm --detail /dev/md0
sudo mdadm --detail /dev/md/1

What drives are installed:
sudo lsblk -o NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL

What luks devices setup:
sudo dmsetup status

References:

• View available hard drives in Ubuntu
• Setup full disk encryption on a secondary hdd in linux
• Automatically unlock luks encrypted drives with a keyfile

• Optimistic Concurrency
• Atomic Updates
• Solr Upsert
• Update handlers
• Near real time indexing

General Solr Links

• Solr for beginners
• Strip html chars before indexing
• Filters
• Sorting fields of text_general field type
• Solr Tokenizers
• Standard Query Parser
• General Query Syntax
• Sorting, Paging and Deep Paging
• Common query parameters

This app is quite nice. At the time of my writing this, it was a little rough around the edges, but I successfully worked with an 8GB heap dump. I was able to find my issue with this while VisualVM crashed. (I still like visualvm a lot though).

For a nice tutorial, see this article on DZone

Performance tuning Solr

Understanding Solr soft commits and data durability

Setting soft commits

Setting commits - solr docs

Understanding Transaction Logs, Soft Commit and Commit in SolrCloud

Near Real Time Searching

Format json from within Intellij

Setting a trace id in Nginx Load Balancer

Logback Mapped Diagnostic Context

Via Consul
or Zookeeper

I discovered a new command line diff tool:

1. Setup up Intellij Command line tools.
2. Command line diff tool

It works on directory comparisons as well as file comparisons.

Delayed Messages with RabbitMQ

Petstore example