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文件预览服务并发瓶颈:LibreOffice 进程卡死?Docker 隔离池+超时强杀+队列调度

文件预览服务并发瓶颈:LibreOffice 进程卡死?Docker 隔离池+超时强杀+队列调度

公司用 LibreOffice 做 Office 文件的在线预览——把 Word/Excel/PPT 转成 PDF,前端用 PDF.js 展示。平时用着没问题,但每个月财务批量导出报表的时候,几十个人同时点预览。LibreOffice 进程 fork 了十几个,其中一个转一个 50MB 的 Excel 文件卡了 10 分钟。这个卡住的进程占着 CPU 不干活,后面排队的请求全堵住了。运维 ssh 上去 kill -9 才恢复。

LibreOffice 的--headless 模式是为单次使用设计的,不是为高并发设计的。今天聊聊怎么用 Docker 容器隔离每个转换任务、超时强杀、再加一个队列缓冲——让文件预览服务从"一卡俱卡"变成"各管各的"。


问题:共享的 LibreOffice 进程没有隔离

最简单的预览方案是在服务器上直接调 LibreOffice:

soffice --headless --convert-to pdf input.docx

第一次调会 fork 一个 LibreOffice 后台进程。后续调用如果这个进程还在,就复用。如果这个进程卡死了——比如遇到了一个损坏的 docx 文件——后续所有转换请求都被卡住。

更糟的是:被 fork 出来的 LibreOffice 进程是共享同一份用户目录的。一个任务的临时文件可能被另一个任务读到。隔离性为零。


方案:Docker 容器池,每个任务独立容器

每个转换任务在独立的 Docker 容器里跑,转换完就销毁。容器的生命周期就是一次转换请求的生命周期。

publicbyte[] convertToPdf(byte[] input, String format) throws Exception {    String containerId = UUID.randomUUID().toString().substring(08);// 1. 把输入文件写入临时目录    Path workDir = Files.createTempDirectory("convert-" + containerId);    Files.write(workDir.resolve("input." + format), input);// 2. 启动 Docker 容器执行转换    Process docker = new ProcessBuilder("docker""run""--rm","--name""convert-" + containerId,"--memory=512m",          // 内存限制"--cpus=1",               // CPU 限制"-v", workDir + ":/data","libreoffice-convert:latest","soffice""--headless""--convert-to""pdf","/data/input." + format    ).start();// 3. 等待完成,最多 60 秒超时boolean finished = docker.waitFor(60, TimeUnit.SECONDS);if (!finished) {        docker.destroyForcibly();  // 超时 → 强杀容器// docker kill convert-xxxthrownew TimeoutException("转换超时");    }// 4. 读取输出byte[] pdf = Files.readAllBytes(workDir.resolve("input.pdf"));// 5. 清理临时文件    Files.walk(workDir).sorted(Comparator.reverseOrder())            .forEach(p -> p.toFile().delete());return pdf;}

关键点:--rm 保证容器退出后自动清理,--memory=512m 限制单个容器的内存防止 OOM,waitFor(60, TimeUnit.SECONDS) 如果超时就destroyForcibly() 强杀。

一个请求卡了,只影响它自己的容器。其他请求在各自的容器里正常运行。隔离性做到了进程级别(Docker 比进程更彻底)。


队列调度:用信号量控制并发数

Docker 容器也有开销——启动一个容器要几百毫秒。如果 100 个人同时点预览,100 个容器同时启动,Docker daemon 本身也会卡。

用信号量限制同时运行的容器数:

@ComponentpublicclassConversionService{// 最多同时运行 5 个转换容器privatefinal Semaphore semaphore = new Semaphore(5);publicbyte[] convert(byte[] input, String format) throws Exception {boolean acquired = semaphore.tryAcquire(30, TimeUnit.SECONDS);if (!acquired) {thrownew BusyException("预览服务繁忙,请稍后重试");        }try {return doConvert(input, format);        } finally {            semaphore.release();        }    }}

如果 5 个容器都在跑,第 6 个请求最多等 30 秒。超过了就返回"预览服务繁忙"。这比让用户无限等要好——用户看到"繁忙"会稍后重试,而不会一直盯着 loading 转圈。


容器预热池:消除启动延迟

Docker 容器每次启动都需要几百毫秒,对于频繁的预览请求来说太慢了。可以维护一个"预热容器池"——提前启动 5 个容器,请求来了直接分配:

预热池(5 个容器提前跑好,idle 状态)  → 请求来了 → 分配容器 → 传文件 → 转换  → 转换完 → 容器回池(或销毁重建)

预热池把容器启动的几百毫秒延迟平摊到了空闲时间。用户请求的响应时间从 800ms 降到 200ms。


总结

进程级卡死+并发无隔离+无超时→文件预览一卡俱卡。

三条防线:

  • Docker 隔离 —— 每个任务独立容器,--rm 自动清理 +--memory 限制内存 +waitFor 超时强杀
  • 信号量并发控制 ——tryAcquire(30s),超过 5 个并发就排队等待
  • 预热容器池 —— 提前建好容器,消除启动延迟

装配之后,100 个人同时预览,5 个并发跑、剩下的排队 30 秒或提示"繁忙"。卡住的不影响别人,超时的自动强杀。


基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-07-09 12:49:48 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/843716.html
  2. 运行时间 : 0.109884s [ 吞吐率:9.10req/s ] 内存消耗:4,883.61kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=1c8a28e59163c0a1689d0644c241913a
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  1. CONNECT:[ UseTime:0.000550s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000751s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000298s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000295s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000476s ]
  6. SELECT * FROM `set` [ RunTime:0.000235s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000536s ]
  8. SELECT * FROM `article` WHERE `id` = 843716 LIMIT 1 [ RunTime:0.001717s ]
  9. UPDATE `article` SET `lasttime` = 1783572588 WHERE `id` = 843716 [ RunTime:0.001310s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000233s ]
  11. SELECT * FROM `article` WHERE `id` < 843716 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000462s ]
  12. SELECT * FROM `article` WHERE `id` > 843716 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000378s ]
  13. SELECT * FROM `article` WHERE `id` < 843716 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003414s ]
  14. SELECT * FROM `article` WHERE `id` < 843716 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005760s ]
  15. SELECT * FROM `article` WHERE `id` < 843716 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009274s ]
0.111742s