code: public AzkabanClientStatus fetchExecutionLog(String execId,
                                                 String jobId,
                                                 String offset,
                                                 String length,
                                                 File ouf) throws AzkabanClientException {
      AzkabanMultiCallables.FetchExecLogCallable callable =
          AzkabanMultiCallables.FetchExecLogCallable.builder()
              .client(this)
              .execId(execId)
              .jobId(jobId)
              .offset(offset)
              .length(length)
              .output(ouf)
              .build();
  
      return runWithRetry(callable, AzkabanClientStatus.class);
    }
docs: Fetch an execution log.