hadoop: reduce memory usage

[tangyoupeng]

No description provided.

[codecov-commenter]

Codecov Report

Merging #2580 (9dddafd) into main (e57686a) will decrease coverage by 0.08%.
The diff coverage is n/a.

❗ Current head 9dddafd differs from pull request most recent head 39b117b. Consider uploading reports for the commit 39b117b to get more accurate results

@@            Coverage Diff             @@
##             main    #2580      +/-   ##
==========================================
- Coverage   59.81%   59.73%   -0.09%     
==========================================
  Files         138      138              
  Lines       23333    23341       +8     
==========================================
- Hits        13956    13942      -14     
- Misses       7569     7586      +17     
- Partials     1808     1813       +5     

Impacted Files	Coverage Δ
pkg/chunk/prefetch.go	94.11% <0.00%> (-5.89%)	⬇️
pkg/chunk/disk_cache.go	79.20% <0.00%> (-1.74%)	⬇️
pkg/chunk/cached_store.go	75.81% <0.00%> (-0.96%)	⬇️
pkg/fs/fs.go	75.73% <0.00%> (-0.85%)	⬇️
pkg/meta/tkv_mem.go	86.61% <0.00%> (-0.71%)	⬇️
pkg/sync/sync.go	43.16% <0.00%> (-0.38%)	⬇️
cmd/bench.go	78.30% <0.00%> (ø)
cmd/stats.go	19.24% <0.00%> (ø)
cmd/profile.go	16.80% <0.00%> (ø)
cmd/objbench.go	61.17% <0.00%> (ø)
... and 5 more

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