We have encountered the following error in Columnstore 1.1.4 combined Single Node.
CPU: 24 Core.
Memory: 28G.
Disk: External storage 1 (DBRoot1)
Data Size: 800G

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We changed some of the major Paris marts from the defaults as follows:
[Config]
VersionBufferFileSize: 100GB
AllowDiskBasedJoin: Y
MaxOutstandingRequests: 200
PmMaxMemorySmallSide: 256M
CPUniqueLimit: 90
MemoryCheckPercent: 95
MaxFileSystemDiskUsagePct: 98
NumBlocksPct: 50
TotalUmMemory: 25

[my.cnf]
max_length_for_sort_data: 2048
innodb_buffer_pool_size = 128M

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• If you execute the same query in one session, it succeeds.
• Perform the same query slightly slower in two sessions.
• When executing the same query concurrently in three sessions, all three errors occur.
    The error is as follows.

The following database error occurred: [ma-3.0.5] [10.2.14-MariaDB] Internal error: InetStreamSocket :: readToMagic: Remote is closed. For information about this error, please refer to SAP Knowledge Base Article 2054721 on the SAP Support Portal. (IES 10901)

[Symptom]

• There is no server connection at all. The OS is not responding at all.