mercurial: changeset 39861:db5501d93bcf

changegroup: remove reordering control (BC) This logic - including the experimental bundle.reorder option - was originally added in a8e3931e3fb5 in 2011 and then later ported to changegroup.py. The intent of this option and associated logic is to control the ordering of revisions in deltagroups in changegroups. At the time it was implemented, only changegroup version 1 existed and generaldelta revlogs were just coming into the world. Changegroup version 1 requires that deltas be made against the last revision sent over the wire. Used with generaldelta, this created an impedance mismatch of sorts and resulted in changegroup producers spending a lot of time recomputing deltas. Revision reordering was introduced so outgoing revisions would be sent in "generaldelta order" and producers would be able to reuse internal deltas from storage. Later on, we introduced changegroup version 2. It supported denoting which revision a delta was against. So we no longer needed to sort outgoing revisions to ensure optimal delta generation from the producer. So, subsequent changegroup versions disabled reordering. We also later made the changelog not store deltas by default. And we also made the changelog send out deltas in storage order. Why we do this for changelog, I'm not sure. Maybe we want to preserve revision order across clones? It doesn't really matter for this commit. Fast forward to 2018. We want to abstract storage backends. And having changegroup code require knowledge about how deltas are stored internally interferes with that goal. This commit removes reordering control from changegroup generation. After this commit, the reordering behavior is: * The changelog is always sent out in storage order (no behavior change). * Non-changelog generaldelta revlogs are reordered to always be in DAG topological order (previously, generaldelta revlogs would be emitted in storage order for version 2 and 3 changegroups). * Non-changelog non-generaldelta revlogs are sent in storage order (no behavior change). * There exists no config option to override behavior. The big difference here is that generaldelta revlogs now *always* have their revisions sorted in DAG order before going out over the wire. This behavior was previously only done for changegroup version 1. Version 2 and version 3 changegroups disabled reordering because the interchange format supported encoding arbitrary delta parents, so reordering wasn't strictly necessary. I can think of a few significant implications for this change. Because changegroup receivers will now see non-changelog revisions in DAG order instead of storage order, the internal storage order of manifests and files may differ substantially between producer and consumer. I don't think this matters that much, since the storage order of manifests and files is largely hidden from users. Only the storage order of changelog matters (because `hg log` shows the changelog in storage order). I don't think there should be any controversy here. The reordering of revisions has implications for changegroup producers. Previously, generaldelta revlogs would be emitted in storage order. And in the common case, the internally-stored delta could effectively be copied from disk into the deltagroup delta. This meant that emitting delta groups for generaldelta revlogs would be mostly linear read I/O. This is desirable for performance. With us now reordering generaldelta revlog revisions in DAG order, the read operations may use more random I/O instead of sequential I/O. This could result in performance loss. But with the prevalence of SSDs and fast random I/O, I'm not too worried. (Note: the optimal emission order for revlogs is actually delta encoding order. But the changegroup code wasn't doing that before or after this change. We could potentially implement that in a later commit.) Changegroups in DAG order will have implications for receivers. Previously, receiving storage order might mean seeing a number of interleaved branches. This would mean long delta chains, sparse I/O, and possibly more fulltext revisions instead of deltas, blowing up storage storage. (This is the same set of problems that sparse revlogs aims to address.) With the producer now sending revisions in DAG order, the receiver also stores revisions in DAG order. That means revisions for the same DAG branch are all grouped together. And this should yield better storage outcomes. In other words, sending the reordered changegroup allows the receiver to have better storage order and for the producer to not propagate its (possibly sub-optimal) internal storage order. On the mozilla-unified repository, this change influences bundle generation: $ hg bundle -t none-v2 -a before: time: real 355.680 secs (user 256.790+0.000 sys 16.820+0.000) after: time: real 382.950 secs (user 281.700+0.000 sys 17.690+0.000) before: 7,150,228,967 bytes (uncompressed) after: 7,041,556,273 bytes (uncompressed) before: 1,669,063,234 bytes (zstd l=3) after: 1,628,598,830 bytes (zstd l=3) $ hg unbundle before: time: real 511.910 secs (user 466.750+0.000 sys 32.680+0.000) after: time: real 487.790 secs (user 443.940+0.000 sys 30.840+0.000) 00manifest.d size: source: 274,924,292 bytes before: 304,741,626 bytes after: 245,252,087 bytes .hg/store total file size: source: 2,649,133,490 before: 2,680,888,130 after: 2,627,875,673 We see the bundle size drop. That's probably because if a revlog internally isn't storing a delta, it will choose to delta against the last emitted revision. And on repos with interleaved branches (like mozilla-unified), the previous revision could be an unrelated branch and therefore be a large delta. But with this patch, the previous revision is likely p1 or p2 and a delta should be small. We also see the manifest size drop by ~50 MB. It's worth noting that the manifest actually *increased* in size by ~25 MB in the old strategy and decreased ~25 MB from its source in the new strategy. Again, my explanation for this is that the DAG ordering in the changegroup is resulting in better grouping of revisions in the receiver, which results in more compact delta chains and higher storage efficiency. Unbundle time also dropped. I suspect this is due to the revlog having to work less to compute deltas since the incoming deltas are more optimal. i.e. the receiver spends less time resolving fulltext revisions as incoming deltas bounce around between DAG branches and delta chains. We also see bundle generation time increase. This is not desirable. However, the regression is only significant on the original repository: if we generate a bundle from the repository created from the new, always reordered bundles, we're close to baseline (if not at it with expected noise): $ hg bundle -t none-v2 -a before (original): time: real 355.680 secs (user 256.790+0.000 sys 16.820+0.000) after (original): time: real 382.950 secs (user 281.700+0.000 sys 17.690+0.000) after (new repo): time: real 362.280 secs (user 260.300+0.000 sys 17.700+0.000) This regression is a bit worrying because it will impact serving canonical repositories (that don't have optimal internal storage unless they are reordered - possibly as part of running `hg debugupgraderepo`). However, this regression will only be noticed by very large changegroups. And I'm guessing/hoping that any repository that large is using clonebundles to mitigate server load. Again, sending DAG order isn't the optimal send order for servers: sending in storage-delta order is. But in order to enable storage-optimal send order, we'll need a storage API that handles sorting. Future commits will introduce such an API. Differential Revision: https://phab.mercurial-scm.org/D4721

--- a/mercurial/changegroup.py	Thu Sep 20 19:31:07 2018 -0700
+++ b/mercurial/changegroup.py	Mon Sep 24 09:41:42 2018 -0700
@@ -36,7 +36,6 @@
 
 from .utils import (
     interfaceutil,
-    stringutil,
 )
 
 _CHANGEGROUPV1_DELTA_HEADER = struct.Struct("20s20s20s20s")
@@ -537,11 +536,11 @@
         yield prefix
     yield data
 
-def _sortnodesnormal(store, nodes, reorder):
+def _sortnodesnormal(store, nodes):
     """Sort nodes for changegroup generation and turn into revnums."""
     # for generaldelta revlogs, we linearize the revs; this will both be
     # much quicker and generate a much smaller bundle
-    if (store._generaldelta and reorder is None) or reorder:
+    if store._generaldelta:
         revs = set(store.rev(n) for n in nodes)
         return dagop.linearize(revs, store.parentrevs)
     else:
@@ -656,7 +655,6 @@
     )
 
 def deltagroup(repo, store, nodes, ischangelog, lookup, forcedeltaparentprev,
-               allowreorder,
                topic=None,
                ellipses=False, clrevtolocalrev=None, fullclnodes=None,
                precomputedellipsis=None):
@@ -691,7 +689,7 @@
     elif ellipses:
         revs = _sortnodesellipsis(store, nodes, cl, lookup)
     else:
-        revs = _sortnodesnormal(store, nodes, allowreorder)
+        revs = _sortnodesnormal(store, nodes)
 
     # In the first pass, collect info about the deltas we'll be
     # generating.
@@ -756,7 +754,7 @@
         progress.complete()
 
 class cgpacker(object):
-    def __init__(self, repo, filematcher, version, allowreorder,
+    def __init__(self, repo, filematcher, version,
                  builddeltaheader, manifestsend,
                  forcedeltaparentprev=False,
                  bundlecaps=None, ellipses=False,
@@ -766,10 +764,6 @@
         filematcher is a matcher that matches on files to include in the
         changegroup. Used to facilitate sparse changegroups.
 
-        allowreorder controls whether reordering of revisions is allowed.
-        This value is used when ``bundle.reorder`` is ``auto`` or isn't
-        set.
-
         forcedeltaparentprev indicates whether delta parents must be against
         the previous revision in a delta group. This should only be used for
         compatibility with changegroup version 1.
@@ -813,13 +807,6 @@
         # Maps ellipsis revs to their roots at the changelog level.
         self._precomputedellipsis = ellipsisroots
 
-        # experimental config: bundle.reorder
-        reorder = repo.ui.config('bundle', 'reorder')
-        if reorder == 'auto':
-            self._reorder = allowreorder
-        else:
-            self._reorder = stringutil.parsebool(reorder)
-
         self._repo = repo
 
         if self._repo.ui.verbose and not self._repo.ui.debugflag:
@@ -862,17 +849,16 @@
         # The fastpath is usually safer than the slowpath, because the filelogs
         # are walked in revlog order.
         #
-        # When taking the slowpath with reorder=None and the manifest revlog
-        # uses generaldelta, the manifest may be walked in the "wrong" order.
-        # Without 'clrevorder', we would get an incorrect linkrev (see fix in
-        # cc0ff93d0c0c).
+        # When taking the slowpath when the manifest revlog uses generaldelta,
+        # the manifest may be walked in the "wrong" order. Without 'clrevorder',
+        # we would get an incorrect linkrev (see fix in cc0ff93d0c0c).
         #
         # When taking the fastpath, we are only vulnerable to reordering
-        # of the changelog itself. The changelog never uses generaldelta, so
-        # it is only reordered when reorder=True. To handle this case, we
-        # simply take the slowpath, which already has the 'clrevorder' logic.
-        # This was also fixed in cc0ff93d0c0c.
-        fastpathlinkrev = fastpathlinkrev and not self._reorder
+        # of the changelog itself. The changelog never uses generaldelta and is
+        # never reordered. To handle this case, we simply take the slowpath,
+        # which already has the 'clrevorder' logic. This was also fixed in
+        # cc0ff93d0c0c.
+
         # Treemanifests don't work correctly with fastpathlinkrev
         # either, because we don't discover which directory nodes to
         # send along with files. This could probably be fixed.
@@ -1003,8 +989,6 @@
         gen = deltagroup(
             self._repo, cl, nodes, True, lookupcl,
             self._forcedeltaparentprev,
-            # Reorder settings are currently ignored for changelog.
-            True,
             ellipses=self._ellipses,
             topic=_('changesets'),
             clrevtolocalrev={},
@@ -1087,7 +1071,7 @@
 
             deltas = deltagroup(
                 self._repo, store, prunednodes, False, lookupfn,
-                self._forcedeltaparentprev, self._reorder,
+                self._forcedeltaparentprev,
                 ellipses=self._ellipses,
                 topic=_('manifests'),
                 clrevtolocalrev=clrevtolocalrev,
@@ -1184,7 +1168,7 @@
 
             deltas = deltagroup(
                 self._repo, filerevlog, filenodes, False, lookupfilelog,
-                self._forcedeltaparentprev, self._reorder,
+                self._forcedeltaparentprev,
                 ellipses=self._ellipses,
                 clrevtolocalrev=clrevtolocalrev,
                 fullclnodes=self._fullclnodes,
@@ -1200,7 +1184,6 @@
         d.node, d.p1node, d.p2node, d.linknode)
 
     return cgpacker(repo, filematcher, b'01',
-                    allowreorder=None,
                     builddeltaheader=builddeltaheader,
                     manifestsend=b'',
                     forcedeltaparentprev=True,
@@ -1215,11 +1198,7 @@
     builddeltaheader = lambda d: _CHANGEGROUPV2_DELTA_HEADER.pack(
         d.node, d.p1node, d.p2node, d.basenode, d.linknode)
 
-    # Since generaldelta is directly supported by cg2, reordering
-    # generally doesn't help, so we disable it by default (treating
-    # bundle.reorder=auto just like bundle.reorder=False).
     return cgpacker(repo, filematcher, b'02',
-                    allowreorder=False,
                     builddeltaheader=builddeltaheader,
                     manifestsend=b'',
                     bundlecaps=bundlecaps,
@@ -1234,7 +1213,6 @@
         d.node, d.p1node, d.p2node, d.basenode, d.linknode, d.flags)
 
     return cgpacker(repo, filematcher, b'03',
-                    allowreorder=False,
                     builddeltaheader=builddeltaheader,
                     manifestsend=closechunk(),
                     bundlecaps=bundlecaps,

--- a/mercurial/configitems.py	Thu Sep 20 19:31:07 2018 -0700
+++ b/mercurial/configitems.py	Mon Sep 24 09:41:42 2018 -0700
@@ -161,10 +161,6 @@
 coreconfigitem('bundle', 'mainreporoot',
     default='',
 )
-# bundle.reorder: experimental config
-coreconfigitem('bundle', 'reorder',
-    default='auto',
-)
 coreconfigitem('censor', 'policy',
     default='abort',
 )

--- a/tests/test-generaldelta.t	Thu Sep 20 19:31:07 2018 -0700
+++ b/tests/test-generaldelta.t	Mon Sep 24 09:41:42 2018 -0700
@@ -279,61 +279,61 @@
   14 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg -R relax-chain debugdeltachain -m
       rev  chain# chainlen     prev   delta       size    rawsize  chainsize     ratio   lindist extradist extraratio
-        0       1        1       -1    base         46         45         46   1.02222        46         0    0.00000
-        1       1        2        0      p1         57         90        103   1.14444       103         0    0.00000
-        2       1        3        1      p1         57        135        160   1.18519       160         0    0.00000
-        3       1        4        2      p1         57        180        217   1.20556       217         0    0.00000
-        4       1        5        3      p1         57        225        274   1.21778       274         0    0.00000
-        5       1        6        4      p1         57        270        331   1.22593       331         0    0.00000
-        6       2        1       -1    base         46         45         46   1.02222        46         0    0.00000
-        7       2        2        6      p1         57         90        103   1.14444       103         0    0.00000
-        8       2        3        7      p1         57        135        160   1.18519       160         0    0.00000
-        9       2        4        8      p1         57        180        217   1.20556       217         0    0.00000
-       10       2        5        9      p1         58        226        275   1.21681       275         0    0.00000
-       11       2        6       10      p1         58        272        333   1.22426       333         0    0.00000
-       12       2        7       11      p1         58        318        391   1.22956       391         0    0.00000
-       13       2        8       12      p1         58        364        449   1.23352       449         0    0.00000
-       14       2        9       13      p1         58        410        507   1.23659       507         0    0.00000
-       15       2       10       14      p1         58        456        565   1.23904       565         0    0.00000
-       16       2       11       15      p1         58        502        623   1.24104       623         0    0.00000
-       17       2       12       16      p1         58        548        681   1.24270       681         0    0.00000
-       18       3        1       -1    base         47         46         47   1.02174        47         0    0.00000
-       19       3        2       18      p1         58         92        105   1.14130       105         0    0.00000
-       20       3        3       19      p1         58        138        163   1.18116       163         0    0.00000
-       21       3        4       20      p1         58        184        221   1.20109       221         0    0.00000
-       22       3        5       21      p1         58        230        279   1.21304       279         0    0.00000
-       23       3        6       22      p1         58        276        337   1.22101       337         0    0.00000
-       24       3        7       23      p1         58        322        395   1.22671       395         0    0.00000
-       25       3        8       24      p1         58        368        453   1.23098       453         0    0.00000
-       26       3        9       25      p1         58        414        511   1.23430       511         0    0.00000
-       27       3       10       26      p1         58        460        569   1.23696       569         0    0.00000
-       28       3       11       27      p1         58        506        627   1.23913       627         0    0.00000
-       29       3       12       28      p1         58        552        685   1.24094       685         0    0.00000
-       30       3       13       29      p1         58        598        743   1.24247       743         0    0.00000
-       31       3       14       30      p1         58        644        801   1.24379       801         0    0.00000
-       32       3       15       31      p1         58        690        859   1.24493       859         0    0.00000
-       33       3       16       32      p1         58        736        917   1.24592       917         0    0.00000
-       34       3       17       33      p1         58        782        975   1.24680       975         0    0.00000
-       35       3       18       34      p1         58        828       1033   1.24758      1033         0    0.00000
-       36       3       19       35      p1         58        874       1091   1.24828      1091         0    0.00000
-       37       3       20       36      p1         58        920       1149   1.24891      1149         0    0.00000
-       38       3       21       37      p1         58        966       1207   1.24948      1207         0    0.00000
-       39       3       22       38      p1         58       1012       1265   1.25000      1265         0    0.00000
-       40       3       23       39      p1         58       1058       1323   1.25047      1323         0    0.00000
-       41       3       24       40      p1         58       1104       1381   1.25091      1381         0    0.00000
-       42       3       25       41      p1         58       1150       1439   1.25130      1439         0    0.00000
-       43       3       26       42      p1         58       1196       1497   1.25167      1497         0    0.00000
-       44       3       27       43      p1         58       1242       1555   1.25201      1555         0    0.00000
-       45       3       28       44      p1         58       1288       1613   1.25233      1613         0    0.00000
-       46       3       29       45      p1         58       1334       1671   1.25262      1671         0    0.00000
-       47       3       30       46      p1         58       1380       1729   1.25290      1729         0    0.00000
-       48       3       31       47      p1         58       1426       1787   1.25316      1787         0    0.00000
-       49       4        1       -1    base        197        316        197   0.62342       197         0    0.00000
-       50       4        2       49      p1         58        362        255   0.70442       255         0    0.00000
-       51       2       13       17      p1         58        594        739   1.24411      2781      2042    2.76319
-       52       5        1       -1    base        369        640        369   0.57656       369         0    0.00000
-       53       6        1       -1    base          0          0          0   0.00000         0         0    0.00000
-       54       7        1       -1    base        369        640        369   0.57656       369         0    0.00000
+        0       1        1       -1    base         47         46         47   1.02174        47         0    0.00000
+        1       1        2        0      p1         58         92        105   1.14130       105         0    0.00000
+        2       1        3        1      p1         58        138        163   1.18116       163         0    0.00000
+        3       1        4        2      p1         58        184        221   1.20109       221         0    0.00000
+        4       1        5        3      p1         58        230        279   1.21304       279         0    0.00000
+        5       1        6        4      p1         58        276        337   1.22101       337         0    0.00000
+        6       1        7        5      p1         58        322        395   1.22671       395         0    0.00000
+        7       1        8        6      p1         58        368        453   1.23098       453         0    0.00000
+        8       1        9        7      p1         58        414        511   1.23430       511         0    0.00000
+        9       1       10        8      p1         58        460        569   1.23696       569         0    0.00000
+       10       1       11        9      p1         58        506        627   1.23913       627         0    0.00000
+       11       1       12       10      p1         58        552        685   1.24094       685         0    0.00000
+       12       1       13       11      p1         58        598        743   1.24247       743         0    0.00000
+       13       1       14       12      p1         58        644        801   1.24379       801         0    0.00000
+       14       1       15       13      p1         58        690        859   1.24493       859         0    0.00000
+       15       1       16       14      p1         58        736        917   1.24592       917         0    0.00000
+       16       1       17       15      p1         58        782        975   1.24680       975         0    0.00000
+       17       1       18       16      p1         58        828       1033   1.24758      1033         0    0.00000
+       18       1       19       17      p1         58        874       1091   1.24828      1091         0    0.00000
+       19       1       20       18      p1         58        920       1149   1.24891      1149         0    0.00000
+       20       1       21       19      p1         58        966       1207   1.24948      1207         0    0.00000
+       21       1       22       20      p1         58       1012       1265   1.25000      1265         0    0.00000
+       22       1       23       21      p1         58       1058       1323   1.25047      1323         0    0.00000
+       23       1       24       22      p1         58       1104       1381   1.25091      1381         0    0.00000
+       24       1       25       23      p1         58       1150       1439   1.25130      1439         0    0.00000
+       25       1       26       24      p1         58       1196       1497   1.25167      1497         0    0.00000
+       26       1       27       25      p1         58       1242       1555   1.25201      1555         0    0.00000
+       27       1       28       26      p1         58       1288       1613   1.25233      1613         0    0.00000
+       28       1       29       27      p1         58       1334       1671   1.25262      1671         0    0.00000
+       29       1       30       28      p1         58       1380       1729   1.25290      1729         0    0.00000
+       30       1       31       29      p1         58       1426       1787   1.25316      1787         0    0.00000
+       31       2        1       -1    base         46         45         46   1.02222        46         0    0.00000
+       32       2        2       31      p1         57         90        103   1.14444       103         0    0.00000
+       33       2        3       32      p1         57        135        160   1.18519       160         0    0.00000
+       34       2        4       33      p1         57        180        217   1.20556       217         0    0.00000
+       35       2        5       34      p1         57        225        274   1.21778       274         0    0.00000
+       36       2        6       35      p1         57        270        331   1.22593       331         0    0.00000
+       37       2        7       36      p1         58        316        389   1.23101       389         0    0.00000
+       38       2        8       37      p1         58        362        447   1.23481       447         0    0.00000
+       39       3        1       -1    base         46         45         46   1.02222        46         0    0.00000
+       40       3        2       39      p1         57         90        103   1.14444       103         0    0.00000
+       41       3        3       40      p1         57        135        160   1.18519       160         0    0.00000
+       42       3        4       41      p1         57        180        217   1.20556       217         0    0.00000
+       43       3        5       42      p1         58        226        275   1.21681       275         0    0.00000
+       44       3        6       43      p1         58        272        333   1.22426       333         0    0.00000
+       45       3        7       44      p1         58        318        391   1.22956       391         0    0.00000
+       46       3        8       45      p1         58        364        449   1.23352       449         0    0.00000
+       47       3        9       46      p1         58        410        507   1.23659       507         0    0.00000
+       48       3       10       47      p1         58        456        565   1.23904       565         0    0.00000
+       49       3       11       48      p1         58        502        623   1.24104       623         0    0.00000
+       50       3       12       49      p1         58        548        681   1.24270       681         0    0.00000
+       51       3       13       50      p1         58        594        739   1.24411       739         0    0.00000
+       52       3       14       51      p1         58        640        797   1.24531       797         0    0.00000
+       53       4        1       -1    base          0          0          0   0.00000         0         0    0.00000
+       54       5        1       -1    base        369        640        369   0.57656       369         0    0.00000
   $ hg clone --pull source-repo --config experimental.maxdeltachainspan=0 noconst-chain --config format.generaldelta=yes
   requesting all changes
   adding changesets
@@ -345,58 +345,58 @@
   14 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg -R noconst-chain debugdeltachain -m
       rev  chain# chainlen     prev   delta       size    rawsize  chainsize     ratio   lindist extradist extraratio
-        0       1        1       -1    base         46         45         46   1.02222        46         0    0.00000
-        1       1        2        0      p1         57         90        103   1.14444       103         0    0.00000
-        2       1        3        1      p1         57        135        160   1.18519       160         0    0.00000
-        3       1        4        2      p1         57        180        217   1.20556       217         0    0.00000
-        4       1        5        3      p1         57        225        274   1.21778       274         0    0.00000
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        54       5        1       -1    base        369        640        369   0.57656       369         0    0.00000

author	Gregory Szorc <gregory.szorc@gmail.com>
	Mon, 24 Sep 2018 09:41:42 -0700
changeset 39861	db5501d93bcf
parent 39860	d9b3cc3d5d07
child 39862	5a9ab91e0a45

mercurial/changegroup.py		file \| annotate \| diff \| comparison \| revisions
mercurial/configitems.py		file \| annotate \| diff \| comparison \| revisions
tests/test-generaldelta.t		file \| annotate \| diff \| comparison \| revisions