Revert "Add gsutil 4.13 to telemetry/third_party"

tools/telemetry/third_party/gsutil/gslib/addlhelp/prod.py

-# -*- coding: utf-8 -*-
-# Copyright 2012 Google Inc. All Rights Reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-"""Additional help about using gsutil for production tasks."""
-
-from __future__ import absolute_import
-
-from gslib.help_provider import HelpProvider
-
-_DETAILED_HELP_TEXT = ("""
-<B>OVERVIEW</B>
-  If you use gsutil in large production tasks (such as uploading or
-  downloading many GiBs of data each night), there are a number of things
-  you can do to help ensure success. Specifically, this section discusses
-  how to script large production tasks around gsutil's resumable transfer
-  mechanism.
-
-
-<B>BACKGROUND ON RESUMABLE TRANSFERS</B>
-  First, it's helpful to understand gsutil's resumable transfer mechanism,
-  and how your script needs to be implemented around this mechanism to work
-  reliably. gsutil uses resumable transfer support when you attempt to upload
-  or download a file larger than a configurable threshold (by default, this
-  threshold is 2 MiB). When a transfer fails partway through (e.g., because of
-  an intermittent network problem), gsutil uses a truncated randomized binary
-  exponential backoff-and-retry strategy that by default will retry transfers up
-  to 6 times over a 63 second period of time (see "gsutil help retries" for
-  details). If the transfer fails each of these attempts with no intervening
-  progress, gsutil gives up on the transfer, but keeps a "tracker" file for
-  it in a configurable location (the default location is ~/.gsutil/, in a file
-  named by a combination of the SHA1 hash of the name of the bucket and object
-  being transferred and the last 16 characters of the file name). When transfers
-  fail in this fashion, you can rerun gsutil at some later time (e.g., after
-  the networking problem has been resolved), and the resumable transfer picks
-  up where it left off.
-
-
-<B>SCRIPTING DATA TRANSFER TASKS</B>
-  To script large production data transfer tasks around this mechanism,
-  you can implement a script that runs periodically, determines which file
-  transfers have not yet succeeded, and runs gsutil to copy them. Below,
-  we offer a number of suggestions about how this type of scripting should
-  be implemented:
-
-  1. When resumable transfers fail without any progress 6 times in a row
-     over the course of up to 63 seconds, it probably won't work to simply
-     retry the transfer immediately. A more successful strategy would be to
-     have a cron job that runs every 30 minutes, determines which transfers
-     need to be run, and runs them. If the network experiences intermittent
-     problems, the script picks up where it left off and will eventually
-     succeed (once the network problem has been resolved).
-
-  2. If your business depends on timely data transfer, you should consider
-     implementing some network monitoring. For example, you can implement
-     a task that attempts a small download every few minutes and raises an
-     alert if the attempt fails for several attempts in a row (or more or less
-     frequently depending on your requirements), so that your IT staff can
-     investigate problems promptly. As usual with monitoring implementations,
-     you should experiment with the alerting thresholds, to avoid false
-     positive alerts that cause your staff to begin ignoring the alerts.
-
-  3. There are a variety of ways you can determine what files remain to be
-     transferred. We recommend that you avoid attempting to get a complete
-     listing of a bucket containing many objects (e.g., tens of thousands
-     or more). One strategy is to structure your object names in a way that
-     represents your transfer process, and use gsutil prefix wildcards to
-     request partial bucket listings. For example, if your periodic process
-     involves downloading the current day's objects, you could name objects
-     using a year-month-day-object-ID format and then find today's objects by
-     using a command like gsutil ls "gs://bucket/2011-09-27-*". Note that it
-     is more efficient to have a non-wildcard prefix like this than to use
-     something like gsutil ls "gs://bucket/*-2011-09-27". The latter command
-     actually requests a complete bucket listing and then filters in gsutil,
-     while the former asks Google Storage to return the subset of objects
-     whose names start with everything up to the "*".
-
-     For data uploads, another technique would be to move local files from a "to
-     be processed" area to a "done" area as your script successfully copies
-     files to the cloud. You can do this in parallel batches by using a command
-     like:
-
-       gsutil -m cp -r to_upload/subdir_$i gs://bucket/subdir_$i
-
-     where i is a shell loop variable. Make sure to check the shell $status
-     variable is 0 after each gsutil cp command, to detect if some of the copies
-     failed, and rerun the affected copies.
-
-     With this strategy, the file system keeps track of all remaining work to
-     be done.
-
-  4. If you have really large numbers of objects in a single bucket
-     (say hundreds of thousands or more), you should consider tracking your
-     objects in a database instead of using bucket listings to enumerate
-     the objects. For example this database could track the state of your
-     downloads, so you can determine what objects need to be downloaded by
-     your periodic download script by querying the database locally instead
-     of performing a bucket listing.
-
-  5. Make sure you don't delete partially downloaded files after a transfer
-     fails: gsutil picks up where it left off (and performs an MD5 check of
-     the final downloaded content to ensure data integrity), so deleting
-     partially transferred files will cause you to lose progress and make
-     more wasteful use of your network. You should also make sure whatever
-     process is waiting to consume the downloaded data doesn't get pointed
-     at the partially downloaded files. One way to do this is to download
-     into a staging directory and then move successfully downloaded files to
-     a directory where consumer processes will read them.
-
-  6. If you have a fast network connection, you can speed up the transfer of
-     large numbers of files by using the gsutil -m (multi-threading /
-     multi-processing) option. Be aware, however, that gsutil doesn't attempt to
-     keep track of which files were downloaded successfully in cases where some
-     files failed to download. For example, if you use multi-threaded transfers
-     to download 100 files and 3 failed to download, it is up to your scripting
-     process to determine which transfers didn't succeed, and retry them. A
-     periodic check-and-run approach like outlined earlier would handle this
-     case.
-
-     If you use parallel transfers (gsutil -m) you might want to experiment with
-     the number of threads being used (via the parallel_thread_count setting
-     in the .boto config file). By default, gsutil uses 10 threads for Linux
-     and 24 threads for other operating systems. Depending on your network
-     speed, available memory, CPU load, and other conditions, this may or may
-     not be optimal. Try experimenting with higher or lower numbers of threads
-     to find the best number of threads for your environment.
-
-<B>RUNNING GSUTIL ON MULTIPLE MACHINES</B>
-  When running gsutil on multiple machines that are all attempting to use the
-  same OAuth2 refresh token, it is possible to encounter rate limiting errors
-  for the refresh requests (especially if all of these machines are likely to
-  start running gsutil at the same time). To account for this, gsutil will
-  automatically retry OAuth2 refresh requests with a truncated randomized
-  exponential backoff strategy like that which is described in the
-  "BACKGROUND ON RESUMABLE TRANSFERS" section above. The number of retries
-  attempted for OAuth2 refresh requests can be controlled via the
-  "oauth2_refresh_retries" variable in the .boto config file.
-""")
-
-
-class CommandOptions(HelpProvider):
-  """Additional help about using gsutil for production tasks."""
-
-  # Help specification. See help_provider.py for documentation.
-  help_spec = HelpProvider.HelpSpec(
-      help_name='prod',
-      help_name_aliases=[
-          'production', 'resumable', 'resumable upload', 'resumable transfer',
-          'resumable download', 'scripts', 'scripting'],
-      help_type='additional_help',
-      help_one_line_summary='Scripting Production Transfers',
-      help_text=_DETAILED_HELP_TEXT,
-      subcommand_help_text={},
-  )