gitccl opened a new pull request, #19389: URL: https://github.com/apache/doris/pull/19389
# Proposed changes Issue Number: close #19283 ## Problem summary Firstly, to reduce memory usage, we do not pre-allocate blocks, instead we lazily allocate block when upper call `get_free_block`. And when upper call `return_free_block` to return free block, we add the block to a queue for memory reuse, and we will free the blocks in the queue when the scanner_context was closed instead of destructed. Secondly, to limit the memory usage of the scanner, we introduce a variable `_free_blocks_capacity` to indicate the current number of free blocks available to the scanners. The number of scanners that can be scheduled will be calculated based on this value. ## Checklist(Required) * [ ] Does it affect the original behavior * [ ] Has unit tests been added * [ ] Has document been added or modified * [ ] Does it need to update dependencies * [X] Is this PR support rollback (If NO, please explain WHY) ## Further comments If this is a relatively large or complex change, kick off the discussion at [d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you chose the solution you did and what alternatives you considered, etc... -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For additional commands, e-mail: commits-h...@doris.apache.org
