cli 0.8.4 - "cannot pickle '_thread.RLock' object" error when uploading samples with 10 parallel connections

[KuzminaAnna]

Describe the problem/error: While uploading 83 BAM samples with 10 parallel connections in DEV from Mac electron client 1.1.6, upload failed with following error message "TypeError("cannot pickle '_thread.RLock' object")". Please see the screenshot below.

Note: This is not reproducible every time , one thing i noticed was when the issue happened , even though the EC was set to utilize 10 parallel uploads user could see 11 parallel uploads. Please see the screenshot below.

Expected behavior: User should be able to upload 83 bam samples with 10 parallel connections in DEV from Mac electron client 1.1.6

Steps to Reproduce:

• Upload below metadata and samples using Mac EC 1.1.6
• Metadata and samples - https://oradocs.oracle.com/documents/link/LF801AC5170A217173339747F3ED6543F7D289AB23C4/folder/FF0DF273D9692C9C4EAC37ABB2B58AFBC6C91E5CFCB9/_HCELEC-593

[KuzminaAnna]

Internal ticket ID https://gbujira.oraclecorp.com/browse/HCELEC-593 Shared Jira ticket ID: https://oc-collab.gc3.ocs.oraclecloud.com/browse/C900000008-1078

[bede]

Thanks Anna. This seems to be a rare issue. Will attempt to reproduce and report back.

[bede]

Sounds like this may have become an issue again with extremely large batches?

Becomes more likely the larger the batch? On Linux only?