MongoDB · January 2, 2024

How to fix MongoDB Error Code - 154 - InconsistentShardIdentity

How to Fix MongoDB Error Code - 154 - InconsistentShardIdentity

MongoDB is a popular NoSQL database that offers high scalability and flexibility. However, like any other software, it can encounter errors that need to be resolved. One such error is MongoDB Error Code - 154 - InconsistentShardIdentity. In this article, we will explore the causes of this error and provide step-by-step instructions on how to fix it.

Understanding MongoDB Error Code - 154 - InconsistentShardIdentity

MongoDB uses sharding to distribute data across multiple servers, allowing for horizontal scaling. Each shard in a MongoDB cluster has a unique identity, known as the shard identity. The shard identity is stored in the config.shards collection in the config database.

Error Code - 154 occurs when MongoDB detects an inconsistent shard identity. This means that the shard identity stored in the config.shards collection does not match the actual identity of the shard. This inconsistency can lead to data integrity issues and must be resolved promptly.

Causes of MongoDB Error Code - 154

There are several reasons why you might encounter Error Code - 154:

  • Manual modification of the shard identity in the config.shards collection
  • Incorrectly restoring a shard from a backup
  • Network issues or hardware failures during shard migration

Fixing MongoDB Error Code - 154

Resolving Error Code - 154 involves updating the shard identity in the config.shards collection to match the actual identity of the shard. Follow these steps to fix the error:

  1. Connect to the MongoDB cluster using the mongo shell or a MongoDB client.
  2. Switch to the config database by running the following command:
use config
  1. Find the inconsistent shard identity by running the following command:
db.shards.find({ _id: "your_shard_id" })

Replace "your_shard_id" with the actual ID of the inconsistent shard.

  1. Verify the current shard identity by checking the host and the shard ID.
  2. If the shard identity is incorrect, update it using the following command:
db.shards.update({ _id: "your_shard_id" }, { $set: { host: "your_shard_host", _id: "your_shard_id" } })

Replace "your_shard_host" and "your_shard_id" with the correct values for your shard.

  1. Verify that the shard identity has been updated by running the find command again.
  2. Repeat steps 3-6 for any other inconsistent shards.

Once you have updated all the inconsistent shard identities, the Error Code - 154 should be resolved, and your MongoDB cluster should be back to normal.

Summary

InconsistentShardIdentity is a MongoDB error that occurs when the shard identity stored in the config.shards collection does not match the actual identity of the shard. This error can lead to data integrity issues and must be fixed promptly. By following the steps outlined in this article, you can resolve MongoDB Error Code - 154 and ensure the smooth operation of your MongoDB cluster.

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