Multi level cache: check context add latency histogram #5596
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yeya24
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friedrichg and
alvinlin123
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alanprot
Signed-off-by: Ben Ye <[email protected]> add backfill histogram Signed-off-by: Ben Ye <[email protected]> update changelog Signed-off-by: Ben Ye <[email protected]> lint Signed-off-by: Ben Ye <[email protected]>
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alanprot
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Oct 24, 2023
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LGTM |
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What this PR does:
This pr checks context in multi level cache and also adds two new histogram metric to track the latency to fetch data and backfill respectively.
The main reason to add the context check is for #5486. We have a backfill mechanism from higher level caches to lower level caches. For example, items exist in L2 cache (for example memcached) will backfill to L1 cache (inmemory cache).
However, when backfilling,
cache.StoreXXXmethod doesn't take context as parameter. When backfilling thousands of keys, it might take quite a long time. In my test environment, I can see backfilling to inmemory cache took more than 2 minute to finish due to high lock contention.The two histogram metrics are useful to measure the fetch and backfilling performance of multi level index cache.
Which issue(s) this PR fixes:
Fixes #
Checklist
CHANGELOG.mdupdated - the order of entries should be[CHANGE],[FEATURE],[ENHANCEMENT],[BUGFIX]