- What do Etcd, Consul, and Zookeeper do?
- Service Registration:
- Host, port number, and sometimes authentication credentials, protocols, versions numbers, and/or environment details.
- Service Discovery:
- Ability for client application to query the central registry to learn of service location.
- Consistent and durable general-purpose K/V store across distributed system.
- Some solutions support this better than others.
- Based on Paxos or some derivative (i.e. Raft) algorithm to quickly converge to a consistent state.
- Service Registration:
- Centralized locking can be based on this K/V store.
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// https://raw.githubusercontent.com/donnut/typescript-ramda/master/ramda.d.ts | |
// https://raw.githubusercontent.com/DefinitelyTyped/DefinitelyTyped/master/lodash/lodash.d.ts | |
declare namespace fp { | |
interface Dictionary<T> { | |
[index: string]: T; | |
} | |
interface CurriedFunction1<T1, R> { |
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# after appcleaner does his magic, do this | |
sudo rm -rf "/Library/Application Support/Paragon Software/" | |
sudo rm /Library/LaunchDaemons/com.paragon-software.installer.plist | |
sudo rm /Library/LaunchDaemons/com.paragon-software.ntfs.loader.plist | |
sudo rm /Library/LaunchDaemons/com.paragon-software.ntfsd.plist | |
sudo rm /Library/LaunchAgents/com.paragon-software.ntfs.notification-agent.plist | |
sudo rm -rf /Library/Filesystems/ufsd_NTFS.fs/ | |
sudo rm -rf /Library/PrivilegedHelperTools/com.paragon-software.installer | |
sudo rm -rf /Library/Extensions/ufsd_NTFS.kext/ |
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# <type>: (If applied, this commit will...) <subject> (Max 50 char) | |
# |<---- Using a Maximum Of 50 Characters ---->| | |
# Explain why this change is being made | |
# |<---- Try To Limit Each Line to a Maximum Of 72 Characters ---->| | |
# Provide links or keys to any relevant tickets, articles or other resources | |
# Example: Github issue #23 |
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Latency Comparison Numbers (~2012) | |
---------------------------------- | |
L1 cache reference 0.5 ns | |
Branch mispredict 5 ns | |
L2 cache reference 7 ns 14x L1 cache | |
Mutex lock/unlock 25 ns | |
Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
Compress 1K bytes with Zippy 3,000 ns 3 us | |
Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |
As configured in my dotfiles.
start new:
tmux
start new with session name: