Database Manual / Sharding / Reference / Inconsistency Types

RoutingTableRangeGap

Description

RoutingTableRangeGap

A range gap exists in the routing table between two consecutive chunks for the same collection.

New in version 7.0.

Format

{
   type: "RoutingTableRangeGap",
   description: "<string>",
   details: {
      namespace: "<string>",
      collectionUUID: <string>,
      chunkA: {<document>},
      chunkB: {<document>}
   }
}

RoutingTableRangeGap inconsistency documents contain the following fields:

FieldTypeDescription

type

string

Type of inconsistency document. Returns a value of RoutingTableRangeGap for this inconsistency type.

description

string

Describes the inconsistency found in the metadata.

details

document

Document with additional information on where the inconsistency exists in the database and sharded cluster.

details.namespace

string

Indicates the database and collection where the inconsistency exists.

details.collectionUUID

UUID

UUID of the collection.

details.chunkA

document

The first chunk that has a gap with the second chunk.

details.chunkB

document

The second chunk that has a gap with the first chunk.

Example

Use the db.adminCommand() method to call the checkMetadataConsistency command:

db.adminCommand( { checkMetadataConsistency: 1 } )

The method returns a cursor with a batch of documents showing the inconsistencies found in the sharding metadata. The example below shows a cursor with a RoutingTableRangeGap inconsistency document:

{
   cursor: {
      id: Long("0"),
      ns: "test.$cmd.aggregate",
      firstBatch: [
         {
            type: "RoutingTableRangeGap",
            description: "Found a gap between two consecutive chunks",
            details: {
               namespace: "test.authors",
               collectionUUID: new UUID("62ebdb7e-a7bb-4151-a620-49d44cef097f"),
               chunkA: {
                 _id: ObjectId("64dde749ac6045c92ef3b9ad"),
                 uuid: new UUID("8c83ea89-ab6b-4ae4-91ab-813cf781284d"),
                 min: {
                    x: MinKey
                 },
                 max: {
                    x: 0
                 },
                 shard: "shard0000",
                 lastmod: Timestamp(1, 0),
                 onCurrentShardSince: Timestamp(1, 0),
                  history: [
                     {
                        validAfter: Timestamp(1, 0),
                        shard: "shard0000"
                     }
                  ]
               },
               chunkB: {
                  _id: ObjectId("64dde749ac6045c92ef3b9af"),
                  uuid: new UUID("8c83ea89-ab6b-4ae4-91ab-813cf781284d"),
                  min: {
                     x: 10
                  },
                  max: {
                     x: MaxKey
                  },
                  shard: "shard0000",
                  lastmod: Timestamp(1, 0),
                  onCurrentShardSince: Timestamp(1, 0),
                  history: [
                     {
                        validAfter: Timestamp(1, 0),
                        shard: "shard0000"
                     }
                  ]
               }
            }
         }
      ],
   },
   ok: 1
}