emitrevision: consider ancestors revision to emit as available base
This should make more delta base valid. This notably affects:
* case where we skipped some parent with empty delta to directly delta against
an ancestors
* case where an intermediate snapshots is stored.
This change means we could sent largish intermediate snapshots over the wire.
However this is actually a sub goal here. Sending snapshots over the wire means
the client have a high odd of simply storing the pre-computed delta instead of
doing a lengthy process that will… end up doing the same intermediate snapshot.
In addition the overall size of snapshot (or any level) is "only" some or the
overall delta size. (0.17% for my mercurial clone, 20% for my clone of Mozilla
try). So Sending them other the wire is unlikely to change large impact on the
bandwidth used.
If we decide that minimising the bandwidth is an explicit goal, we should
introduce new logic to filter-out snapshot as delta. The current code has no
notion explicite of snapshot so far, they just tended to fall into the wobbly
filtering options.
In some cases, this patch can yield large improvement to the bundling time:
### data-env-vars.name = mozilla-try-2019-02-18-zstd-sparse-revlog
# benchmark.name = perf-bundle
# benchmark.variants.revs = last-100000
before: 68.787066 seconds
after: 47.552677 seconds (-30.87%)
That translate to large improvement to the pull time :
### data-env-vars.name = mozilla-try-2019-02-18-zstd-sparse-revlog
# benchmark.name = pull
# benchmark.variants.
issue6528 = disabled
# benchmark.variants.revs = last-100000
before: 142.186625 seconds
after: 75.897745 seconds (-46.62%)
No significant negative impact have been observed.
#!/usr/bin/env python3
#
# A small script to automatically reject idle Diffs
#
# you need to set the PHABBOT_USER and PHABBOT_TOKEN environment variable for authentication
import datetime
import os
import sys
import phabricator
MESSAGE = """There seems to have been no activities on this Diff for the past 3 Months.
By policy, we are automatically moving it out of the `need-review` state.
Please, move it back to `need-review` without hesitation if this diff should still be discussed.
:baymax:need-review-idle:
"""
PHAB_URL = "https://phab.mercurial-scm.org/api/"
USER = os.environ.get("PHABBOT_USER", "baymax")
TOKEN = os.environ.get("PHABBOT_TOKEN")
NOW = datetime.datetime.now()
# 3 months in seconds
DELAY = 60 * 60 * 24 * 30 * 3
def get_all_diff(phab):
"""Fetch all the diff that the need review"""
return phab.differential.query(
status="status-needs-review",
order="order-modified",
paths=[('HG', None)],
)
def filter_diffs(diffs, older_than):
"""filter diffs to only keep the one unmodified sin <older_than> seconds"""
olds = []
for d in diffs:
modified = int(d['dateModified'])
modified = datetime.datetime.fromtimestamp(modified)
d["idleFor"] = idle_for = NOW - modified
if idle_for.total_seconds() > older_than:
olds.append(d)
return olds
def nudge_diff(phab, diff):
"""Comment on the idle diff and reject it"""
diff_id = int(d['id'])
phab.differential.createcomment(
revision_id=diff_id, message=MESSAGE, action="reject"
)
if not USER:
print(
"not user specified please set PHABBOT_USER and PHABBOT_TOKEN",
file=sys.stderr,
)
elif not TOKEN:
print(
"not api-token specified please set PHABBOT_USER and PHABBOT_TOKEN",
file=sys.stderr,
)
sys.exit(1)
phab = phabricator.Phabricator(USER, host=PHAB_URL, token=TOKEN)
phab.connect()
phab.update_interfaces()
print('Hello "%s".' % phab.user.whoami()['realName'])
diffs = get_all_diff(phab)
print("Found %d Diffs" % len(diffs))
olds = filter_diffs(diffs, DELAY)
print("Found %d old Diffs" % len(olds))
for d in olds:
diff_id = d['id']
status = d['statusName']
modified = int(d['dateModified'])
idle_for = d["idleFor"]
msg = 'nudging D%s in "%s" state for %s'
print(msg % (diff_id, status, idle_for))
# uncomment to actually affect phab
nudge_diff(phab, d)