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Add new ReadFileWithVerify storage-layer API (#4349)

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This is an enhancement to the XL/distributed-XL mode. FS mode is
unaffected.

The ReadFileWithVerify storage-layer call is similar to ReadFile with
the additional functionality of performing bit-rot checking. It
accepts additional parameters for a hashing algorithm to use and the
expected hex-encoded hash string.

This patch provides significant performance improvement because:

1. combines the step of reading the file (during
erasure-decoding/reconstruction) with bit-rot verification;

2. limits the number of file-reads; and

3. avoids transferring the file over the network for bit-rot
verification.

ReadFile API is implemented as ReadFileWithVerify with empty hashing
arguments.

Credits to AB and Harsha for the algorithmic improvement.

Fixes #4236.
This commit is contained in:
Aditya Manthramurthy
2017-05-16 14:21:52 -07:00
committed by Harshavardhana
parent cae4683971
commit 8975da4e84
20 changed files with 471 additions and 88 deletions
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2
cmd/storage-interface.go
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@@ -37,6 +37,8 @@ type StorageAPI interface {
// File operations.
ListDir(volume, dirPath string) ([]string, error)
ReadFile(volume string, path string, offset int64, buf []byte) (n int64, err error)
ReadFileWithVerify(volume string, path string, offset int64, buf []byte,
algo HashAlgo, expectedHash string) (n int64, err error)
PrepareFile(volume string, path string, len int64) (err error)
AppendFile(volume string, path string, buf []byte) (err error)
RenameFile(srcVolume, srcPath, dstVolume, dstPath string) error