Make S3 upload part size configurable (#26533)

server/public/model/config.go

@@ -122,7 +122,9 @@ const (
 
 	SqlSettingsDefaultDataSource = "postgres://mmuser:mostest@localhost/mattermost_test?sslmode=disable&connect_timeout=10&binary_parameters=yes"
 
-	FileSettingsDefaultDirectory = "./data/"
+	FileSettingsDefaultDirectory                   = "./data/"
+	FileSettingsDefaultS3UploadPartSizeBytes       = 5 * 1024 * 1024   // 5MB
+	FileSettingsDefaultS3ExportUploadPartSizeBytes = 100 * 1024 * 1024 // 100MB
 
 	ImportSettingsDefaultDirectory     = "./import"
 	ImportSettingsDefaultRetentionDays = 30
@@ -1579,6 +1581,7 @@ type FileSettings struct {
 	AmazonS3SSE                        *bool   `access:"environment_file_storage,write_restrictable,cloud_restrictable"`
 	AmazonS3Trace                      *bool   `access:"environment_file_storage,write_restrictable,cloud_restrictable"`
 	AmazonS3RequestTimeoutMilliseconds *int64  `access:"environment_file_storage,write_restrictable,cloud_restrictable"` // telemetry: none
+	AmazonS3UploadPartSizeBytes        *int64  `access:"environment_file_storage,write_restrictable,cloud_restrictable"` // telemetry: none
 	// Export store settings
 	DedicatedExportStore                     *bool   `access:"environment_file_storage,write_restrictable"`
 	ExportDriverName                         *string `access:"environment_file_storage,write_restrictable"`
@@ -1595,6 +1598,7 @@ type FileSettings struct {
 	ExportAmazonS3Trace                      *bool   `access:"environment_file_storage,write_restrictable"`
 	ExportAmazonS3RequestTimeoutMilliseconds *int64  `access:"environment_file_storage,write_restrictable"` // telemetry: none
 	ExportAmazonS3PresignExpiresSeconds      *int64  `access:"environment_file_storage,write_restrictable"` // telemetry: none
+	ExportAmazonS3UploadPartSizeBytes        *int64  `access:"environment_file_storage,write_restrictable"` // telemetry: none
 }
 
 func (s *FileSettings) SetDefaults(isUpdate bool) {
@@ -1703,6 +1707,10 @@ func (s *FileSettings) SetDefaults(isUpdate bool) {
 		s.AmazonS3RequestTimeoutMilliseconds = NewInt64(30000)
 	}
 
+	if s.AmazonS3UploadPartSizeBytes == nil {
+		s.AmazonS3UploadPartSizeBytes = NewInt64(FileSettingsDefaultS3UploadPartSizeBytes)
+	}
+
 	if s.DedicatedExportStore == nil {
 		s.DedicatedExportStore = NewBool(false)
 	}
@@ -1764,6 +1772,10 @@ func (s *FileSettings) SetDefaults(isUpdate bool) {
 	if s.ExportAmazonS3PresignExpiresSeconds == nil {
 		s.ExportAmazonS3PresignExpiresSeconds = NewInt64(21600) // 6h
 	}
+
+	if s.ExportAmazonS3UploadPartSizeBytes == nil {
+		s.ExportAmazonS3UploadPartSizeBytes = NewInt64(FileSettingsDefaultS3ExportUploadPartSizeBytes)
+	}
 }
 
 type EmailSettings struct {