如何通过 yarnClient 在代码中获取日志聚合

Question

我正在关注这个关于通过 java API 创建 YarnApp 的示例。

https://github.com/hortonworks/simple-yarn-app

工作正常，但是，日志只存在执行，之后日志就消失了。

我如何通过代码捕捉到这一点？或者启用一个选项？

Answer 1

您可以在应用程序完成后使用 LogCliHelpers 按应用程序 ID 查找日志：

import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.hadoop.yarn.api.records.ApplicationSubmissionContext;
import org.apache.hadoop.yarn.client.api.YarnClientApplication;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.exceptions.YarnException;
import org.apache.hadoop.yarn.logaggregation.LogCLIHelpers;

import java.io.IOException;
import java.io.PrintStream;

public static void getLogs(YarnConfiguration conf, YarnClientApplication app) throws IOException, YarnException {
    ApplicationSubmissionContext appContext =
            app.getApplicationSubmissionContext();
    ApplicationId appId = appContext.getApplicationId();
    LogCLIHelpers logCLIHelpers = new LogCLIHelpers();
    logCLIHelpers.setConf(conf);
    FileSystem fs = FileSystem.get(conf);
    Path logFile = new Path("/path/to/log/file.log");
    fs.create(logFile, false);
    try (PrintStream printStream = new PrintStream(logFile.toString())) {
      logCLIHelpers.dumpAllContainersLogs(appId, UserGroupInformation.getCurrentUser().getShortUserName(), printStream);
    }
}