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@joe-elliott joe-elliott commented Apr 8, 2025

What this PR does:
I discovered this opportunity while researching panics in the querier. This PR reduces allocations related to using memcached caching by pooling buffers.

  • Use the memcached allocator option to pull buffers from a pool on read
  • Return buffers to the pool in frontend and object storage cache
  • Moved the prealloc buffer pool to pkg/pool to be used by cache
  • Removed the logic to copy before setting in cache. This is synchronous in both memcached and redis so there is no reason to copy.
  • Added a changelog for Bugfix? Improve EOF handling in readers.go #4963 b/c I forgot!

Checklist

  • Tests updated
  • Documentation added
  • CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX]

Signed-off-by: Joe Elliott <number101010@gmail.com>
Signed-off-by: Joe Elliott <number101010@gmail.com>
Signed-off-by: Joe Elliott <number101010@gmail.com>
Signed-off-by: Joe Elliott <number101010@gmail.com>
Signed-off-by: Joe Elliott <number101010@gmail.com>
Signed-off-by: Joe Elliott <number101010@gmail.com>
Signed-off-by: Joe Elliott <number101010@gmail.com>
Signed-off-by: Joe Elliott <number101010@gmail.com>
Signed-off-by: Joe Elliott <number101010@gmail.com>
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@javiermolinar javiermolinar left a comment

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Nice clean up

Signed-off-by: Joe Elliott <number101010@gmail.com>
@joe-elliott joe-elliott merged commit 3338cbf into grafana:main Apr 9, 2025
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2 participants