MongoDB Sharding document #430
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the-redback
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shudipta
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May 2, 2019
shudipta
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May 3, 2019
tamalsaha
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May 4, 2019
| - ***config servers:*** Config servers store metadata and configuration settings for the cluster. As of MongoDB 3.4, config servers must be deployed as a replica set (CSRS). | ||
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| <p align="center"> | ||
| <img alt="sharded-cluster" src="/docs/images/mongodb/sharded-cluster.png" width="620" height="440"> |
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We need to add source of these images.
tamalsaha
reviewed
May 4, 2019
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| The mongos selects the primary shard when creating a new database by picking the shard in the cluster that has the least amount of data. mongos uses the totalSize field returned by the listDatabase command as a part of the selection criteria. | ||
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| Diagram of a primary shard. A primary shard contains non-sharded collections as well as chunks of documents from sharded collections. Shard A is the primary shard. |
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Where is it Diagram of a primary shard.?
tamalsaha
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May 4, 2019
| - `spec.shardTopology` represents the topology configuration for sharding. | ||
| - `shard` represents configuration for Shard component of mongodb. | ||
| - `shards` represents number of shards for a mongodb deployment. Each shard is deployed as a [replicaset](/docs/guides/mongodb/clustering/replication_concept.md). | ||
| - `replicas` represents number of replicas of each shard replicaset. |
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That means total number of pods = 1 + replicas?
tamalsaha
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May 4, 2019
| mongodb.kubedb.com/mongo-sh created | ||
| ``` | ||
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| Here, |
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Should we use the word pod instead of node here to clarify that this is k8s pod (or db node, not k8s node)
tamalsaha
reviewed
May 4, 2019
| - `replicas` represents number of replicas for configServer replicaset. Here, configServer is deployed as a replicaset of mongodb. | ||
| - `prefix` represents the prefix of configServer nodes. | ||
| - `configSource` is an optional field to provide custom configuration file for configSource (i.e mongod.cnf). If specified, this file will be used as configuration file otherwise default configuration file will be used. | ||
| - `podTemplate` is an optional configuration for pods. |
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We need to point to a doc that explains the options available to a podTemplate.
Signed-off-by: Tamal Saha <[email protected]>
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