Redis is a popular in-memory data structure store used by many developers worldwide. It is widely known for its speed, simplicity, and versatility in handling various types of data. Redis provides several features that make it a favorite among developers such as caching, messaging, and pub/sub functionality.
One of the critical features that make Redis stand out from other databases is its ability to scale horizontally. Redis can be scaled horizontally by using Redis Cluster, which allows you to distribute your data across multiple nodes in a cluster.
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Redis Cluster uses a concept called slots to distribute data among the nodes. A slot is a range of keys that are mapped to a specific node in the cluster. In Redis Cluster, there are 16384 slots available for use.
You might wonder why Redis Cluster has exactly 16384 slots? The answer lies in how Redis distributes keys among the nodes in the cluster.
When you insert or retrieve a key from Redis Cluster, it uses a hash function to determine which slot the key belongs to. The hash function used by Redis is called CRC16 (Cyclic Redundancy Check 16-bit). The CRC16 hash function returns an integer value between 0 and 65535.
To map the integer value returned by the hash function to one of the available slots, Redis takes the modulo of the integer value with 16384 (the total number of available slots). This ensures that each integer value obtained from the hash function maps uniquely to one of the available slots.
In simple terms, if you have n nodes in your cluster, each node will be responsible for managing approximately 16384/n slots. For example, if you have six nodes in your cluster, each node will manage approximately 2730 slots.
Having exactly 16384 slots also ensures that you can add or remove nodes from your cluster without having to rehash all your keys. When you add or remove a node from your cluster, only a portion of the keys need to be moved to the new node. This is because each node is responsible for managing a specific range of slots.
In conclusion, Redis Cluster has 16384 slots because it provides a unique mapping between the integer value obtained from the hash function and one of the available slots. This ensures that each key is distributed evenly among the nodes in the cluster and allows you to scale horizontally by adding or removing nodes without having to rehash all your keys.
9 Related Question Answers Found
Slots are provided in the slotted castle nut to allow for a positive stop when the bolt is tightened. The slots also help to keep the bolt from loosening by providing resistance to turning forces. The castle nut is tightened onto the bolt by first aligning the slots in the nut with the flats on the bolt head.
When it comes to building a custom PC, one of the most important components you need to consider is the RAM. RAM, or Random Access Memory, is essential for the functioning of your computer as it stores data that your processor needs to access quickly. Without RAM, your computer would not be able to run any applications or perform any tasks.
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One question that many people have when building their own PC is why there are 4 RAM slots on many motherboards.
It is a good idea to have the slots covered in your computer case for several reasons. First, it helps to keep the dust out of the case. Second, it protects the delicate electronic components inside the computer from being damaged by static electricity.
If you’re a laptop user, you might have noticed that some laptops come with four RAM slots instead of the usual two. This might make you wonder why your laptop has so many RAM slots, and what the benefits of having four RAM slots are. In this article, we’ll take a closer look at why your laptop might have four RAM slots.
If you were an avid gamer in the early 2000s, chances are you owned a Game Boy Advance (GBA). This handheld console was a revolutionary product that introduced gaming on the go to the masses.
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However, with the release of Nintendo DS, people were left wondering why Nintendo included a slot for GBA cartridges in their new console. The answer is simple yet intriguing.
When it comes to playing slots, there are a lot of strategies that players use in an attempt to increase their chances of winning. One of the most common strategies is maxing out the volume on the machine. But does this actually help?
There are a few reasons why your laptop might say it has 4 RAM slots. The most likely reason is that your laptop is configured for quad-channel memory, which means that it can use four RAM modules at once for increased performance. However, it’s also possible that your laptop only has two physical RAM slots but supports up to 4GB of RAM total.
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If your laptop is configured for quad-channel memory, then you’ll need to install four identical RAM modules in order to take advantage of the increased performance.
If you have ever looked at a slotted castle nut and wondered why it has slots, then you are not alone. Slots are a common feature in castle nuts, but their purpose is not always immediately clear. In this article, we will explore the reasons why slots are provided in slotted castle nuts.
Your computer has four RAM slots because that’s the maximum number of RAM sticks that can fit in your motherboard. Most motherboards have four RAM slots because that’s the industry standard. So, if you want to upgrade your RAM, you’ll need to purchase new sticks and replace the old ones.
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There are a few reasons why your computer might have four RAM slots.
