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aa7c601eca
Use timestamp->LSN mapping instead of file modification time. Fix 'latest_gc_cutoff_lsn' - set it to the minimum of pitr_cutoff and gc_cutoff. Add new test: test_pitr_gc
97 lines
2.8 KiB
Python
97 lines
2.8 KiB
Python
import os
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import shutil
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import subprocess
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from typing import Any, List
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from fixtures.log_helper import log
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def get_self_dir() -> str:
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""" Get the path to the directory where this script lives. """
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return os.path.dirname(os.path.abspath(__file__))
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def mkdir_if_needed(path: str) -> None:
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""" Create a directory if it doesn't already exist
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Note this won't try to create intermediate directories.
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"""
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try:
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os.mkdir(path)
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except FileExistsError:
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pass
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assert os.path.isdir(path)
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def subprocess_capture(capture_dir: str, cmd: List[str], **kwargs: Any) -> str:
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""" Run a process and capture its output
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Output will go to files named "cmd_NNN.stdout" and "cmd_NNN.stderr"
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where "cmd" is the name of the program and NNN is an incrementing
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counter.
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If those files already exist, we will overwrite them.
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Returns basepath for files with captured output.
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"""
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assert type(cmd) is list
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base = os.path.basename(cmd[0]) + '_{}'.format(global_counter())
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basepath = os.path.join(capture_dir, base)
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stdout_filename = basepath + '.stdout'
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stderr_filename = basepath + '.stderr'
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with open(stdout_filename, 'w') as stdout_f:
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with open(stderr_filename, 'w') as stderr_f:
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log.info('(capturing output to "{}.stdout")'.format(base))
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subprocess.run(cmd, **kwargs, stdout=stdout_f, stderr=stderr_f)
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return basepath
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_global_counter = 0
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def global_counter() -> int:
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""" A really dumb global counter.
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This is useful for giving output files a unique number, so if we run the
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same command multiple times we can keep their output separate.
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"""
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global _global_counter
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_global_counter += 1
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return _global_counter
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def lsn_to_hex(num: int) -> str:
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""" Convert lsn from int to standard hex notation. """
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return "{:X}/{:X}".format(num >> 32, num & 0xffffffff)
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def lsn_from_hex(lsn_hex: str) -> int:
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""" Convert lsn from hex notation to int. """
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l, r = lsn_hex.split('/')
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return (int(l, 16) << 32) + int(r, 16)
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def print_gc_result(row):
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log.info("GC duration {elapsed} ms".format_map(row))
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log.info(
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" total: {layers_total}, needed_by_cutoff {layers_needed_by_cutoff}, needed_by_pitr {layers_needed_by_pitr}"
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" needed_by_branches: {layers_needed_by_branches}, not_updated: {layers_not_updated}, removed: {layers_removed}"
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.format_map(row))
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# path to etcd binary or None if not present.
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def etcd_path():
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return shutil.which("etcd")
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# Traverse directory to get total size.
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def get_dir_size(path: str) -> int:
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"""Return size in bytes."""
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totalbytes = 0
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for root, dirs, files in os.walk(path):
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for name in files:
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totalbytes += os.path.getsize(os.path.join(root, name))
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return totalbytes
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