Support sparsefiles Copy in blockfile snapshotter #10197
+51
−15
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Signed-off-by: Zhao Jizhuang <571130360@qq.com>
|
Hi @zhaojizhuang. Thanks for your PR. I'm waiting for a containerd member to verify that this patch is reasonable to test. If it is, they should reply with Once the patch is verified, the new status will be reflected by the I understand the commands that are listed here. Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. |
|
Can we stat each file after the copy to see if the block usage differs? The expectation right now is blockfile snapshotter is not very efficient when copy file range is not used. Are the sparse file properties preserved when it doesn't go through a full read/write copy of the file? |
|
@dmcgowan We use the command "fallocate -d copy.img" to make the snapshot blockfile sparse. here is the test demo,using nginxt,which has 7 layers AfterAfter 7 snapshots (18~24) were sparsified, the results are as follows: du -h du -h --apparent-size stat beforebefore 7 snapshots (18~24) were sparsified, the results are as follows: du -h du -h --apparent-size stat |
|
gently ping ... @dmcgowan |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Adds the ability to copy sparse files and can be configured in the config.
In the Go language,
io.Copyis equivalent tocp --sparse=never xxx, so even if the initial scratch file is a sparse file, it is still a non-sparse file after go io.copy. Each snapshot block file will occupy the full block file size by default.