线上Timeout waiting for connection from pool问题分析和解决方案

现象

理论分析

代码分析

解决方案

方案一：直接修改pollingConnectionManager

方案二：修改HttpClient

参考

现象

线上共有5个类似服务，但是只有流量较大的服务会出现成功率的问题。

问题的表现主要是在GetFile(fileId=AgACAgUAAxkDAAEbP1JlJPxyJM82phEKhYYZYfY9ozwkOgACV7YxGyAgKVWHvIUKD2IoYQEAAwIAA3kAAzAE)时会失败。具体如下：

[2023-10-10 07:26:16.985][ERROR][pool-9-thread-14][pool-9-thread-14][][c.t.c.t.SpringTelegramWebhook:122][SpringTelegramWebhook.getFile TelegramApiException][GetFile(fileId=AgACAgUAAxkDAAEbP1JlJPxyJM82phEKhYYZYfY9ozwkOgACV7YxGyAgKVWHvIUKD2IoYQEAAwIAA3kAAzAE)][500][org.telegram.telegrambots.meta.exceptions.TelegramApiException: Unable to execute getFile methodat org.telegram.telegrambots.bots.DefaultAbsSender.sendApiMethod(DefaultAbsSender.java:1117)at org.telegram.telegrambots.meta.bots.AbsSender.execute(AbsSender.java:64)at com.turbo.commons.telegram.SpringTelegramWebhook.lambda$getFile$4(SpringTelegramWebhook.java:119)at java.util.concurrent.FutureTask.run(FutureTask.java:266)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.http.conn.ConnectionPoolTimeoutException: Timeout waiting for connection from poolat org.apache.http.impl.conn.PoolingHttpClientConnectionManager.leaseConnection(PoolingHttpClientConnectionManager.java:316)at org.apache.http.impl.conn.PoolingHttpClientConnectionManager$1.get(PoolingHttpClientConnectionManager.java:282)at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:190)at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186)at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)at org.telegram.telegrambots.bots.DefaultAbsSender.sendHttpPostRequest(DefaultAbsSender.java:1149)at org.telegram.telegrambots.bots.DefaultAbsSender.sendMethodRequest(DefaultAbsSender.java:1145)at org.telegram.telegrambots.bots.DefaultAbsSender.sendApiMethod(DefaultAbsSender.java:1114)... 6 more

其中，关键错误信息：

Caused by: org.apache.http.conn.ConnectionPoolTimeoutException: Timeout waiting for connection from pool。

业务代码如下：

private BufferedImage getImageByFileId(String fileId, DefaultTelegramBot bot) throws Exception {GetFile getFile = new GetFile();getFile.setFileId(fileId);InputStream inputStream = bot.getFile(getFile);return ImageIO.read(inputStream);}