importer

var BlockSizeLimit = 1048576 // 1 MB

BlockSizeLimit specifies the maximum size an imported block can have.

var DefaultLinksPerBlock = (roughLinkBlockSize / roughLinkSize)

DefaultLinksPerBlock governs how the importer decides how many links there will be per block. This calculation is based on expected distributions of:

• the expected distribution of block sizes
• the expected distribution of link sizes
• desired access speed

For now, we use:

var roughLinkBlockSize = 1 << 13 // 8KB
var roughLinkSize = 288          // sha256 + framing + name
var DefaultLinksPerBlock = (roughLinkBlockSize / roughLinkSize)

See calc_test.go

var ErrSizeLimitExceeded = fmt.Errorf("object size limit exceeded")

ErrSizeLimitExceeded signals that a block is larger than BlockSizeLimit.

var IndirectBlockDataSize = 0

IndirectBlocksCopyData governs whether indirect blocks should copy over data from their first child, and how much. If this is 0, indirect blocks have no data, only links. If this is larger, Indirect blocks will copy as much as (maybe less than) this many bytes.

This number should be <= (BlockSizeLimit - (DefaultLinksPerBlock * LinkSize)) Note that it is not known here what the LinkSize is, because the hash function could vary wildly in size. Exercise caution when setting this option. For safety, it will be clipped to (BlockSizeLimit - (DefaultLinksPerBlock * 256))