优化内存使用

[jizi19911101]

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[codecov]

Codecov Report

Merging #22 (1b9e8d2) into master (1711c71) will increase coverage by 0.51%.
The diff coverage is 100.00%.

❗ Current head 1b9e8d2 differs from pull request most recent head e850e5d. Consider uploading reports for the commit e850e5d to get more accurate results

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
+ Coverage   78.35%   78.86%   +0.51%     
==========================================
  Files          15       15              
  Lines         790      795       +5     
==========================================
+ Hits          619      627       +8     
+ Misses        130      128       -2     
+ Partials       41       40       -1     

Flag	Coverage Δ
unittests	78.86% <100.00%> (+0.51%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/collector/collector.go	76.83% <100.00%> (+1.97%)	⬆️
pkg/storage/badger/store.go	77.34% <100.00%> (+0.38%)	⬆️

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