Aerospike backup fails with code 4

Hello everyone! We encountered an error while creating an aerospike backup:

2021-04-30 06:55:09 GMT [INF] [68013] 25% complete (~44319 KiB/s, ~6042 rec/s, ~7510 B/rec)
2021-04-30 06:55:09 GMT [INF] [68013] ~1h19m2s remaining

2021-04-30 06:55:20 GMT [INF] [68013] 25% complete (~48098 KiB/s, ~6602 rec/s, ~7459 B/rec)
2021-04-30 06:55:20 GMT [INF] [68013] ~1h12m9s remaining

2021-04-30 06:55:30 GMT [INF] [68013] 25% complete (~46766 KiB/s, ~6397 rec/s, ~7485 B/rec)
2021-04-30 06:55:30 GMT [INF] [68013] ~1h14m18s remaining

2021-04-30 06:55:40 GMT [INF] [68013] 25% complete (~45469 KiB/s, ~6277 rec/s, ~7417 B/rec)
2021-04-30 06:55:40 GMT [INF] [68013] ~1h15m32s remaining

2021-04-30 07:29:50 GMT [ERR] [68014] Error while running node scan for BB92200069A6F56 - code 4: AEROSPIKE_ERR_REQUEST_INVALID at src/main/aerospike/aerospike_scan.c:313

2021-04-30 07:29:51 GMT [INF] [68013] Backed up 9874694 record(s), 0 secondary index(es), 1 UDF file(s) from 3 node(s), 75486817756 byte(s) in total (~7644 B/rec)

An error can occur at any stage of creating a backup.

Info about cluster:

Cluster size - 3 nodes

Real factor - 2.

Aerospike Community Edition build 5.2.0.10

OS: CentOS Linux release 8.3.2011

kernel: 4.18.0-240.1.1.el8_3.x86_64

Please tell me what could be the problem? Thank you in advance.

Interesting. Does this occur on the same server consistently? on all servers in the cluster? have you tried installing the latest astools? what version of astools is installed? is there any corresponding error on the server ? grep -v INFO /var/log/aerospike/aerospike.log || journalctl -u aerospike --since=-7d|grep -v INFO

I think you can find latest download versions/install instructions through this link Documentation | Aerospike

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