Check log file for lines that take a lot of time.

log_search.py

import re

YARN_LOGFILE_REGEX = re.compile("^verbose ([0-9\.]*)")
# Maximum time per line.
MAX_TIME = 0.1

with open("install.log", 'r', encoding='utf16') as f:
    lines = f.readlines()
    for i in range(0, len(lines)):
        if i+1 == len(lines):
            break
        line = lines[i]
        nextLine = lines[i+1]
        time = YARN_LOGFILE_REGEX.search(line)
        nextTime = YARN_LOGFILE_REGEX.search(nextLine)
        if (time is None) or (nextTime is None):
            continue
        if (float(nextTime.group(1)) - float(time.group(1))) > MAX_TIME:
            print(line, nextLine, sep='')