feat: improve datanode snapshot creation #11396
Draft
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
EVODelavega
reviewed
Jun 19, 2024
jeremyletang
force-pushed
the
feature/improve-datanode-snapshot-creation-time
branch
from
08f9a31
to
7b3aa5f
Compare
jeremyletang
force-pushed
the
feature/improve-datanode-snapshot-creation-time
branch
7 times, most recently
from
9098e67
to
59b88d6
Compare
jeremyletang
force-pushed
the
feature/improve-datanode-snapshot-creation-time
branch
4 times, most recently
from
3978470
to
4e2961c
Compare
As of now, the snapshot are created in a sequential and blocking way in the datanode. This means that while a snapshot is being taken, no block can be processed. The following approach is made: - the database is locked with a transaction - queries are generated - one by one the query are: - executed - the result piped into the file system - finally the lock is released, and later the files are added to ipfs. The bottle neck here is that the results are being save on the fs as they arrive, which is unecessary and amount for 95% of the time spent snapshoting (and so blocking anything else). To prevent this, we keep those results from the database in buffers, and only save them to file via a worker go routine. Cache buffer size in datanode snapshot. Signed-off-by: Jeremy Letang <[email protected]>
Signed-off-by: Jeremy Letang <[email protected]>
Signed-off-by: Jeremy Letang <[email protected]>
jeremyletang
force-pushed
the
feature/improve-datanode-snapshot-creation-time
branch
from
128f1b9
to
882fadd
Compare
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Outdated suggestions cannot be applied.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.
As of now, the snapshot are created in a sequential and blocking way in the datanode. This means that while a snapshot is being taken, no block can be processed.
The following approach is made:
The bottle neck here is that the results are being save on the fs as they arrive, which is unecessary and amount for 95% of the time spent snapshoting (and so blocking anything else).
To prevent this, we keep those results from the database in buffers, and only save them to file via a worker go routine.