Add excel-export module: Apache POI 6.0.0 XSSF vs SXSSF under a fixed heap, 1,000,000 rows streamed with StreamingResponseBody, OpenCSV, sheet rolling, temp-file cleanup

Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_017ic4b4VQVEJWetTT1dYzyJ
2026-10-29 06:18:42 +00:00
parent bded24d929
commit 9b1da079c6
29 changed files with 1113 additions and 0 deletions
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+# 1,000,000 rows: SXSSF and CSV under a 64 MB heap, XSSF given a large heap
+# openjdk version "25.0.5" 2026-10-20 LTS | 2 vCPU | 8027 MB RAM
+# indicative numbers from a shared sandbox, one run per line; see README
+SXSSF   /export/sxssf?rows=1000000         Xmx=64m   http=200 curl=0  bytes=59408766     37.5s | peak used heap    56 MB | max after GC    20 MB |  163 GC pauses, longest   43 ms | peak RSS   208 MB | temp dir peak  475 MB, files left 0 | OOM=no
+CSV     /export/csv?rows=1000000           Xmx=64m   http=200 curl=0  bytes=104476584     4.3s | peak used heap    52 MB | max after GC    15 MB |   82 GC pauses, longest   40 ms | peak RSS   175 MB | temp dir peak    0 MB, files left 0 | OOM=no
+XSSF    /export/xssf?rows=1000000          Xmx=3g    http=500 curl=0  bytes=107         273.6s | peak used heap     - MB | max after GC  3072 MB |  132 GC pauses, longest 12794 ms | peak RSS  3295 MB | temp dir peak    0 MB, files left 0 | OOM=YES | body: {"timestamp":"2026-10-29T06:11:02.454Z","status":500,"error":"Internal Server Error","path":"/export/xssf"}