[Opt](TabletSchema) reuse TabletColumn info to reduce mem (#42448) #43326
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
|
Thank you for your contribution to Apache Doris. Since 2024-03-18, the Document has been moved to doris-website. |
1. When there are a large number of identical TabletColumns in the cluster, which usually occurs when VARIANT type columns are modified and added, each Rowset has an individual TabletSchema. Excessive TabletSchemas can lead to significant memory overhead. Reusing memory for identical TabletColumns would greatly reduce this memory consumption. 2. Serialized TabletSchema as LRU cache key could also increase memusage when large sets of schemas are in LRU cache, so inorder to reduce the memory footprint we just record the key signature caculated by generating an UUID by hash algorithm， and lookup the key signature in LRU cache， and check the key in case of hash collision
eldenmoon
force-pushed
the
opt-schema-mem
branch
from
e67c0c4
to
fc8cbc5
Compare
|
run buildall |
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Outdated suggestions cannot be applied.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.
(#42448)