70 mongodb network_error ai_generated partial

MongoServerError: ShardNotFound: no config server primary available for shard

ID: mongodb/sharded-cluster-no-config-primary

Also available as: JSON · Markdown · 中文
70%Fix Rate
88%Confidence
1Evidence
2024-01-20First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
mongodb 7.0 active — — —
mongodb 6.0 active — — —
mongodb 5.0 active — — —
mongodb 4.4 active — — —

Root Cause

The config server replica set has no primary node due to network partition, election failure, or node crash.

generic

中文

配置服务器副本集由于网络分区、选举失败或节点崩溃而没有主节点。

Official Documentation

https://www.mongodb.com/docs/manual/reference/error-codes/#mongodb-error-70

Workarounds

  1. 75% success Check config server replica set status: rs.status() on the config server, then force re-election if necessary: rs.stepDown() on the current primary or rs.reconfig() to add a new member. 
    Check config server replica set status: rs.status() on the config server, then force re-election if necessary: rs.stepDown() on the current primary or rs.reconfig() to add a new member.
  2. 60% success Temporarily route reads to secondary with readPreference=secondaryPreferred if writes are not critical: db.getMongo().setReadPref('secondaryPreferred') 
    Temporarily route reads to secondary with readPreference=secondaryPreferred if writes are not critical: db.getMongo().setReadPref('secondaryPreferred')

中文步骤

  1. 检查配置服务器副本集状态：在配置服务器上运行rs.status()，必要时强制重新选举：在当前主节点上运行rs.stepDown()或使用rs.reconfig()添加新成员。
  2. 如果写操作不关键，临时将读操作路由到从节点：db.getMongo().setReadPref('secondaryPreferred')

Dead Ends

Common approaches that don't work:

  1. 90% fail

    The mongos is not the issue; the config server replica set needs repair.

  2. 95% fail

    Connection pool size does not affect config server primary availability.