[pitr] oplog slicer is paused for lock

MongoDB
,
1

[pitr] oplog slicer is paused for lock [Snapshot backup, opid: 692902205e216c21fa537eaf]
The oplog slicer remains paused indefinitely, preventing the backup from completing and affecting point-in-time recovery capabilities.

Steps to Reproduce:

  1. Deploy Percona MongoDB cluster in Kubernetes

  2. Create a backup schedule/trigger manual backup

  3. Monitor backup agent logs

  4. Observe the “oplog slicer is paused for lock” message

i run operator 1.21.1

2

The oplog slicer is paused for lock is not an error, and the cause of this is that PBM stops saving PITR chunks when a logical backup is running. For example, if you have 1TB of data, it’s expected that the backup will take a long time to complete.
Isn’t it ever continuing in your case?
Have you ever had a successful backup?

3

I have some backup ready and some backup fails due the same reason oplog slicer is paused for lock

Screenshot from 2025-12-14 09-50-47
Screenshot from 2025-12-14 09-50-47454×139 27.1 KB

4

after see the logs on another node of backup-agent

mark RS as error dump: dump namespaces: pay_687dsfsd851393.filemanager_logs: close: upload: "pay_687dsfsd851393.filemanager_logs": save during split-merge mw: upload to S3: operation error S3: PutObject, exceeded maximum number of attempts, 6, https response error StatusCode: 504, RequestID: N/A, HostID: N/A, api error GatewayTimeout: The server did not respond in time.:

can you help?

5

as per the log above you are getting timeouts talking to the storage. The problem is either the network or the remote storage then.

6

Manual backups execute successfully, however, the automated cron-based backups are failing with an error.
this my config
—————————-

backup:
enabled: true
image: perconalab/percona-server-mongodb-operator:main-backup

storages:
  NBG1:
    type: s3
    s3:
      bucket: test-bk-test
      region: NBG1
      credentialsSecret: mongodb-prod-1-backup-s3
      endpointUrl: https://nbdc.your-objectstorage.com  
      retryer:
        numMaxRetries: 5
        minRetryDelay: 30ms
        maxRetryDelay: 10m
      prefix: ""
      uploadPartSize: 20971520
      maxUploadParts: 10000

pitr:
  enabled: true
  oplogOnly: false

oplogSpanMin: 10

  compressionType: gzip
  compressionLevel: 6

tasks:
  # =============  
  #  DAILY BACKUP at 12PM UTC 0
  # =============
 - name: mongodb-prod-1-backup-daily 
   enabled: true  
   retention:  
      count: 3 # keep 1 backup each day, 3 days max  
      type: count  
      deleteFromStorage: true  
   type: logical # best for storage, slower    
   schedule: 0 2 \* \* \* # daily at 2 AM UTC 0  
   storageName: NBG1
  # =============  
  #  WEEKLY BACKUP at SATURDAY 12AM UTC 0
  # =============
 - name: mongodb-prod-1-backup-weekly 
   enabled: true  
   retention:  
      count: 2 # keep 1 backup each week, 2 weeks max   
      type: count  
      deleteFromStorage: true  
   type: logical # best for storage, slower    
   schedule: 0 0 \* \* 5 # weekly at 12AM UTC 0 friday    
   storageName: NBG1
  # =============  
  #  MONTHLY BACKUP at SATURDAY 12AM UTC 0
  # ============= 
 - name: mongodb-prod-1-backup-MONTHLY 
   enabled: true  
   retention:  
      count:  3 # keep 1 backup each month, 3 months max   
      type: count  
      deleteFromStorage: true  
   type: logical # best for storage, slower    
   schedule: 0 4 1 \* \* # 1st day of every month at 4 AM   
   storageName: NBG1