Fix memory leak in distributor due to cluster label #4739
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alanprot
approved these changes
May 12, 2022
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LGTM |
alvinlin123
reviewed
May 12, 2022
| @@ -19,3 +21,11 @@ func StringsMap(values []string) map[string]bool { | |||
| } | |||
| return out | |||
| } | |||
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| // StringsClone returns a copy input s | |||
| // see: https://github.com/golang/go/blob/master/src/strings/clone.go | |||
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:-) nice! We should update Go one day.
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Signed-off-by: 🌲 Harry 🌊 John 🏔 <johrry@amazon.com>
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alvinlin123
approved these changes
May 12, 2022
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Thanks for this. Note we also have a function with the same intent here: cortex/pkg/ingester/index/index.go Lines 110 to 113 in 4e9fc3a In Go it is fairly common to copy a tiny function rather than exposing it - "a little copying is better than a little dependency". |
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What this PR does:
The HA cluster label is exposed through the distributor metrics. This can cause memory leak when one tenant sends a lot of different clusters. The metrics is only cleaned up after 30 mins.
The memory is leaked because the
yoloStringin the request is kept alive for a longer period.The following is the memory consumed by the distributor over time without cloning the cluster label.
The following is the memory consumed by distributor when cluster label was cloned.
The above leak in
snappyDecodeappears to have disappeared.Which issue(s) this PR fixes:
Fixes #
Checklist
CHANGELOG.mdupdated - the order of entries should be[CHANGE],[FEATURE],[ENHANCEMENT],[BUGFIX]