[#1439] object: Sort nodes by priority metrics to compute GET/SEARCH requests

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

.docker/Dockerfile.adm

@@ -1,4 +1,4 @@
-FROM golang:1.22 AS builder
+FROM golang:1.23 AS builder
 ARG BUILD=now
 ARG VERSION=dev
 ARG REPO=repository

.docker/Dockerfile.ci

@@ -1,4 +1,4 @@
-FROM golang:1.22
+FROM golang:1.23
 
 WORKDIR /tmp
 

.docker/Dockerfile.cli

@@ -1,4 +1,4 @@
-FROM golang:1.22 AS builder
+FROM golang:1.23 AS builder
 ARG BUILD=now
 ARG VERSION=dev
 ARG REPO=repository

.docker/Dockerfile.ir

@@ -1,4 +1,4 @@
-FROM golang:1.22 AS builder
+FROM golang:1.23 AS builder
 ARG BUILD=now
 ARG VERSION=dev
 ARG REPO=repository

.docker/Dockerfile.storage

@@ -1,4 +1,4 @@
-FROM golang:1.22 AS builder
+FROM golang:1.23 AS builder
 ARG BUILD=now
 ARG VERSION=dev
 ARG REPO=repository

Makefile

@@ -27,12 +27,6 @@ DIRS = $(BIN) $(RELEASE)
 CMDS = $(notdir $(basename $(wildcard cmd/frostfs-*)))
 BINS = $(addprefix $(BIN)/, $(CMDS))
 
-# .deb package versioning
-OS_RELEASE = $(shell lsb_release -cs)
-PKG_VERSION ?= $(shell echo $(VERSION) | sed "s/^v//" | \
-			sed -E "s/(.*)-(g[a-fA-F0-9]{6,8})(.*)/\1\3~\2/" | \
-			sed "s/-/~/")-${OS_RELEASE}
-
 OUTPUT_LINT_DIR ?= $(abspath $(BIN))/linters
 LINT_DIR = $(OUTPUT_LINT_DIR)/golangci-lint-$(LINT_VERSION)-v$(TRUECLOUDLAB_LINT_VERSION)
 TMP_DIR := .cache
@@ -58,7 +52,7 @@ LOCODE_DB_PATH=$(abspath ./.cache/locode_db)
 LOCODE_DB_VERSION=v0.4.0
 
 .PHONY: help all images dep clean fmts fumpt imports test lint docker/lint
-		prepare-release debpackage pre-commit unpre-commit
+		prepare-release pre-commit unpre-commit
 
 # To build a specific binary, use it's name prefix with bin/ as a target
 # For example `make bin/frostfs-node` will build only storage node binary
@@ -263,19 +257,6 @@ clean:
 	rm -rf $(BIN)
 	rm -rf $(RELEASE)
 
-# Package for Debian
-debpackage:
-	dch -b --package frostfs-node \
-			--controlmaint \
-			--newversion $(PKG_VERSION) \
-			--distribution $(OS_RELEASE) \
-			"Please see CHANGELOG.md for code changes for $(VERSION)"
-	dpkg-buildpackage --no-sign -b
-
-# Cleanup deb package build directories
-debclean:
-	dh clean
-
 # Download locode database
 locode-download:
 	mkdir -p $(TMP_DIR)

debian/changelog

@@ -1,5 +0,0 @@
-frostfs-node (0.0.1) stable; urgency=medium
-
-  * Initial package build
-
- -- TrueCloudLab <tech@frostfs.info>  Tue, 25 Oct 2022 21:10:49 +0300

debian/clean

@@ -1,2 +0,0 @@
-man/
-debian/*.bash-completion

debian/control

@@ -1,39 +0,0 @@
-Source: frostfs-node
-Section: misc
-Priority: optional
-Maintainer: TrueCloudLab <tech@frostfs.info>
-Build-Depends: debhelper-compat (= 13), dh-sequence-bash-completion, devscripts
-Standards-Version: 4.5.1
-Homepage: https://fs.neo.org/
-Vcs-Git: https://git.frostfs.info/TrueCloudLab/frostfs-node.git
-Vcs-Browser: https://git.frostfs.info/TrueCloudLab/frostfs-node
-
-Package: frostfs-storage
-Architecture: any
-Depends: ${misc:Depends}
-Description: FrostFS Storage node
- FrostFS is a decentralized distributed object storage integrated with the NEO
- Blockchain. FrostFS Nodes are organized in a peer-to-peer network that takes care
- of storing and distributing user's data. Any Neo user may participate in the
- network and get paid for providing storage resources to other users or store
- their data in FrostFS and pay a competitive price for it.
-
-Package: frostfs-ir
-Architecture: any
-Depends: ${misc:Depends}, frostfs-locode-db
-Description: FrostFS InnerRing node
- FrostFS is a decentralized distributed object storage integrated with the NEO
- Blockchain. FrostFS Nodes are organized in a peer-to-peer network that takes care
- of storing and distributing user's data. Any Neo user may participate in the
- network and get paid for providing storage resources to other users or store
- their data in FrostFS and pay a competitive price for it.
-
-Package: frostfs-cli
-Architecture: any
-Depends: ${misc:Depends}
-Description: CLI tools for FrostFS
- FrostFS is a decentralized distributed object storage integrated with the NEO
- Blockchain. FrostFS Nodes are organized in a peer-to-peer network that takes care
- of storing and distributing user's data. Any Neo user may participate in the
- network and get paid for providing storage resources to other users or store
- their data in FrostFS and pay a competitive price for it.

debian/copyright

@@ -1,23 +0,0 @@
-Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
-Upstream-Name: frostfs-node
-Upstream-Contact: tech@frostfs.info
-Source: https://git.frostfs.info/TrueCloudLab/frostfs-node
-
-Files: *
-Copyright: 2022-2023 TrueCloudLab (@TrueCloudLab), contributors of FrostFS project
-           2018-2022 NeoSPCC (@nspcc-dev), contributors of NeoFS project
-           (https://git.frostfs.info/TrueCloudLab/frostfs-node/src/branch/master/CREDITS.md)
-
-License: GPL-3
- This program is free software: you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published
- by the Free Software Foundation; version 3.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program or at /usr/share/common-licenses/GPL-3
- If not, see <http://www.gnu.org/licenses/>.

debian/frostfs-cli.docs

@@ -1,4 +0,0 @@
-CONTRIBUTING.md
-CREDITS.md
-README.md
-cmd/frostfs-adm/docs

debian/frostfs-cli.install

@@ -1,3 +0,0 @@
-bin/frostfs-adm   usr/bin
-bin/frostfs-cli   usr/bin
-bin/frostfs-lens  usr/bin

debian/frostfs-cli.manpages

@@ -1 +0,0 @@
-man/*

debian/frostfs-ir.dirs

@@ -1,2 +0,0 @@
-/etc/frostfs/ir
-/var/lib/frostfs/ir

debian/frostfs-ir.docs

@@ -1,3 +0,0 @@
-CONTRIBUTING.md
-CREDITS.md
-README.md

debian/frostfs-ir.install

@@ -1 +0,0 @@
-bin/frostfs-ir    usr/bin

debian/frostfs-ir.postinst

@@ -1,51 +0,0 @@
-#!/bin/sh
-#
-# see: dh_installdeb(1)
-
-set -e
-
-# summary of how this script can be called:
-#        * <postinst> `configure' <most-recently-configured-version>
-#        * <old-postinst> `abort-upgrade' <new version>
-#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
-#          <new-version>
-#        * <postinst> `abort-remove'
-#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
-#          <failed-install-package> <version> `removing'
-#          <conflicting-package> <version>
-# for details, see https://www.debian.org/doc/debian-policy/ or
-# the debian-policy package
-
-case "$1" in
-    configure)
-        USERNAME=ir
-        id -u frostfs-ir >/dev/null 2>&1 || useradd -s /usr/sbin/nologin -d /var/lib/frostfs/ir --system -M -U -c "FrostFS InnerRing node" frostfs-ir
-        if ! dpkg-statoverride --list /etc/frostfs/$USERNAME >/dev/null; then
-            chown -f root:frostfs-$USERNAME /etc/frostfs/$USERNAME
-            chmod -f 0750 /etc/frostfs/$USERNAME
-            chown -f root:frostfs-$USERNAME /etc/frostfs/$USERNAME/config.yml
-            chown -f root:frostfs-$USERNAME /etc/frostfs/$USERNAME/control.yml
-            chmod -f 0640 /etc/frostfs/$USERNAME/config.yml || true
-            chmod -f 0640 /etc/frostfs/$USERNAME/control.yml || true
-        fi
-        USERDIR="$(getent passwd frostfs-$USERNAME | cut -d: -f6)"
-        if ! dpkg-statoverride --list frostfs-"$USERDIR" >/dev/null; then
-            chown -f frostfs-$USERNAME: "$USERDIR"
-        fi
-    ;;
-
-    abort-upgrade|abort-remove|abort-deconfigure)
-    ;;
-
-    *)
-        echo "postinst called with unknown argument \`$1'" >&2
-        exit 1
-    ;;
-esac
-
-# dh_installdeb will replace this with shell code automatically
-# generated by other debhelper scripts.
-
-#DEBHELPER#
-
-exit 0

debian/frostfs-ir.postrm

@@ -1,40 +0,0 @@
-#!/bin/sh
-#
-# see: dh_installdeb(1)
-
-set -e
-
-# summary of how this script can be called:
-#        * <postrm> `remove'
-#        * <postrm> `purge'
-#        * <old-postrm> `upgrade' <new-version>
-#        * <new-postrm> `failed-upgrade' <old-version>
-#        * <new-postrm> `abort-install'
-#        * <new-postrm> `abort-install' <old-version>
-#        * <new-postrm> `abort-upgrade' <old-version>
-#        * <disappearer's-postrm> `disappear' <overwriter>
-#          <overwriter-version>
-# for details, see https://www.debian.org/doc/debian-policy/ or
-# the debian-policy package
-
-
-case "$1" in
-    purge)
-        rm -rf /var/lib/frostfs/ir/*
-    ;;
-
-    remove|upgrade|failed-upgrade|abort-install|abort-upgrade|disappear)
-    ;;
-
-    *)
-        echo "postrm called with unknown argument \`$1'" >&2
-        exit 1
-    ;;
-esac
-
-# dh_installdeb will replace this with shell code automatically
-# generated by other debhelper scripts.
-
-#DEBHELPER#
-
-exit 0

debian/frostfs-ir.preinst

@@ -1,34 +0,0 @@
-#!/bin/sh
-#
-# see: dh_installdeb(1)
-
-set -e
-
-# summary of how this script can be called:
-#        * <new-preinst> `install'
-#        * <new-preinst> `install' <old-version>
-#        * <new-preinst> `upgrade' <old-version>
-#        * <old-preinst> `abort-upgrade' <new-version>
-# for details, see https://www.debian.org/doc/debian-policy/ or
-# the debian-policy package
-
-
-case "$1" in
-    install|upgrade)
-    ;;
-
-    abort-upgrade)
-    ;;
-
-    *)
-        echo "preinst called with unknown argument \`$1'" >&2
-        exit 1
-    ;;
-esac
-
-# dh_installdeb will replace this with shell code automatically
-# generated by other debhelper scripts.
-
-#DEBHELPER#
-
-exit 0

debian/frostfs-ir.prerm

@@ -1,37 +0,0 @@
-#!/bin/sh
-#
-# see: dh_installdeb(1)
-
-set -e
-
-# summary of how this script can be called:
-#        * <prerm> `remove'
-#        * <old-prerm> `upgrade' <new-version>
-#        * <new-prerm> `failed-upgrade' <old-version>
-#        * <conflictor's-prerm> `remove' `in-favour' <package> <new-version>
-#        * <deconfigured's-prerm> `deconfigure' `in-favour'
-#          <package-being-installed> <version> `removing'
-#          <conflicting-package> <version>
-# for details, see https://www.debian.org/doc/debian-policy/ or
-# the debian-policy package
-
-
-case "$1" in
-    remove|upgrade|deconfigure)
-    ;;
-
-    failed-upgrade)
-    ;;
-
-    *)
-        echo "prerm called with unknown argument \`$1'" >&2
-        exit 1
-    ;;
-esac
-
-# dh_installdeb will replace this with shell code automatically
-# generated by other debhelper scripts.
-
-#DEBHELPER#
-
-exit 0

debian/frostfs-ir.service

@@ -1,17 +0,0 @@
-[Unit]
-Description=FrostFS InnerRing node
-Requires=network.target
-
-[Service]
-Type=notify
-NotifyAccess=all
-ExecStart=/usr/bin/frostfs-ir --config /etc/frostfs/ir/config.yml
-User=frostfs-ir
-Group=frostfs-ir
-WorkingDirectory=/var/lib/frostfs/ir
-Restart=always
-RestartSec=5
-PrivateTmp=true
-
-[Install]
-WantedBy=multi-user.target

debian/frostfs-storage.dirs

@@ -1,3 +0,0 @@
-/etc/frostfs/storage
-/srv/frostfs
-/var/lib/frostfs/storage

debian/frostfs-storage.docs

@@ -1,4 +0,0 @@
-docs/storage-node-configuration.md
-CONTRIBUTING.md
-CREDITS.md
-README.md

debian/frostfs-storage.install

@@ -1 +0,0 @@
-bin/frostfs-node  usr/bin

debian/frostfs-storage.postinst

@@ -1,55 +0,0 @@
-#!/bin/sh
-#
-# see: dh_installdeb(1)
-
-set -e
-
-# summary of how this script can be called:
-#        * <postinst> `configure' <most-recently-configured-version>
-#        * <old-postinst> `abort-upgrade' <new version>
-#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
-#          <new-version>
-#        * <postinst> `abort-remove'
-#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
-#          <failed-install-package> <version> `removing'
-#          <conflicting-package> <version>
-# for details, see https://www.debian.org/doc/debian-policy/ or
-# the debian-policy package
-
-case "$1" in
-    configure)
-        USERNAME=storage
-        id -u frostfs-$USERNAME >/dev/null 2>&1 || useradd -s /usr/sbin/nologin -d /var/lib/frostfs/$USERNAME --system -M -U -c "FrostFS Storage node" frostfs-$USERNAME
-        if ! dpkg-statoverride --list /etc/frostfs/$USERNAME >/dev/null; then
-            chown -f root:frostfs-$USERNAME /etc/frostfs/$USERNAME
-            chmod -f 0750 /etc/frostfs/$USERNAME
-            chown -f root:frostfs-$USERNAME /etc/frostfs/$USERNAME/config.yml
-            chown -f root:frostfs-$USERNAME /etc/frostfs/$USERNAME/control.yml
-            chmod -f 0640 /etc/frostfs/$USERNAME/config.yml || true
-            chmod -f 0640 /etc/frostfs/$USERNAME/control.yml || true
-        fi
-        USERDIR=$(getent passwd frostfs-$USERNAME | cut -d: -f6)
-        if ! dpkg-statoverride --list frostfs-"$USERDIR" >/dev/null; then
-            chown -f frostfs-$USERNAME: "$USERDIR"
-        fi
-        USERDIR=/srv/frostfs
-        if ! dpkg-statoverride --list frostfs-$USERDIR >/dev/null; then
-            chown -f frostfs-$USERNAME: $USERDIR
-        fi
-    ;;
-
-    abort-upgrade|abort-remove|abort-deconfigure)
-    ;;
-
-    *)
-        echo "postinst called with unknown argument \`$1'" >&2
-        exit 1
-    ;;
-esac
-
-# dh_installdeb will replace this with shell code automatically
-# generated by other debhelper scripts.
-
-#DEBHELPER#
-
-exit 0

debian/frostfs-storage.postrm

@@ -1,40 +0,0 @@
-#!/bin/sh
-#
-# see: dh_installdeb(1)
-
-set -e
-
-# summary of how this script can be called:
-#        * <postrm> `remove'
-#        * <postrm> `purge'
-#        * <old-postrm> `upgrade' <new-version>
-#        * <new-postrm> `failed-upgrade' <old-version>
-#        * <new-postrm> `abort-install'
-#        * <new-postrm> `abort-install' <old-version>
-#        * <new-postrm> `abort-upgrade' <old-version>
-#        * <disappearer's-postrm> `disappear' <overwriter>
-#          <overwriter-version>
-# for details, see https://www.debian.org/doc/debian-policy/ or
-# the debian-policy package
-
-
-case "$1" in
-    purge)
-        rm -rf /var/lib/frostfs/storage/*
-    ;;
-
-    remove|upgrade|failed-upgrade|abort-install|abort-upgrade|disappear)
-    ;;
-
-    *)
-        echo "postrm called with unknown argument \`$1'" >&2
-        exit 1
-    ;;
-esac
-
-# dh_installdeb will replace this with shell code automatically
-# generated by other debhelper scripts.
-
-#DEBHELPER#
-
-exit 0

debian/frostfs-storage.preinst

@@ -1,34 +0,0 @@
-#!/bin/sh
-#
-# see: dh_installdeb(1)
-
-set -e
-
-# summary of how this script can be called:
-#        * <new-preinst> `install'
-#        * <new-preinst> `install' <old-version>
-#        * <new-preinst> `upgrade' <old-version>
-#        * <old-preinst> `abort-upgrade' <new-version>
-# for details, see https://www.debian.org/doc/debian-policy/ or
-# the debian-policy package
-
-
-case "$1" in
-    install|upgrade)
-    ;;
-
-    abort-upgrade)
-    ;;
-
-    *)
-        echo "preinst called with unknown argument \`$1'" >&2
-        exit 1
-    ;;
-esac
-
-# dh_installdeb will replace this with shell code automatically
-# generated by other debhelper scripts.
-
-#DEBHELPER#
-
-exit 0

debian/frostfs-storage.prerm

@@ -1,37 +0,0 @@
-#!/bin/sh
-#
-# see: dh_installdeb(1)
-
-set -e
-
-# summary of how this script can be called:
-#        * <prerm> `remove'
-#        * <old-prerm> `upgrade' <new-version>
-#        * <new-prerm> `failed-upgrade' <old-version>
-#        * <conflictor's-prerm> `remove' `in-favour' <package> <new-version>
-#        * <deconfigured's-prerm> `deconfigure' `in-favour'
-#          <package-being-installed> <version> `removing'
-#          <conflicting-package> <version>
-# for details, see https://www.debian.org/doc/debian-policy/ or
-# the debian-policy package
-
-
-case "$1" in
-    remove|upgrade|deconfigure)
-    ;;
-
-    failed-upgrade)
-    ;;
-
-    *)
-        echo "prerm called with unknown argument \`$1'" >&2
-        exit 1
-    ;;
-esac
-
-# dh_installdeb will replace this with shell code automatically
-# generated by other debhelper scripts.
-
-#DEBHELPER#
-
-exit 0

debian/frostfs-storage.service

@@ -1,17 +0,0 @@
-[Unit]
-Description=FrostFS Storage node
-Requires=network.target
-
-[Service]
-Type=notify
-NotifyAccess=all
-ExecStart=/usr/bin/frostfs-node --config /etc/frostfs/storage/config.yml
-User=frostfs-storage
-Group=frostfs-storage
-WorkingDirectory=/srv/frostfs
-Restart=always
-RestartSec=5
-PrivateTmp=true
-
-[Install]
-WantedBy=multi-user.target

debian/rules

@@ -1,40 +0,0 @@
-#!/usr/bin/make -f
-
-# Do not try to strip Go binaries
-export DEB_BUILD_OPTIONS := nostrip
-
-%:
-	dh $@ --with bash-completion
-
-override_dh_auto_test:
-
-override_dh_auto_install:
-	echo $(DEB_BUILD_OPTIONS)
-	dh_auto_install
-
-	bin/frostfs-adm gendoc --type man man/
-	bin/frostfs-cli gendoc --type man man/
-
-	bin/frostfs-adm completion bash > debian/frostfs-adm.bash-completion
-	bin/frostfs-cli completion bash > debian/frostfs-cli.bash-completion
-	install -m 0755 -d debian/frostfs-cli/usr/share/fish/completions/
-	install -m 0755 -d debian/frostfs-cli/usr/share/zsh/vendor-completions/
-	bin/frostfs-adm completion fish > debian/frostfs-cli/usr/share/fish/completions/frostfs-adm.fish
-	bin/frostfs-adm completion zsh > debian/frostfs-cli/usr/share/zsh/vendor-completions/_frostfs-adm
-	bin/frostfs-cli completion fish > debian/frostfs-cli/usr/share/fish/completions/frostfs-cli.fish
-	bin/frostfs-cli completion zsh > debian/frostfs-cli/usr/share/zsh/vendor-completions/_frostfs-cli
-
-	install -T -m 0640 config/example/ir.yaml debian/frostfs-ir/etc/frostfs/ir/config.yml
-	install -T -m 0640 config/example/ir-control.yaml debian/frostfs-ir/etc/frostfs/ir/control.yml
-	install -T -m 0640 config/example/node.yaml debian/frostfs-storage/etc/frostfs/storage/config.yml
-	install -T -m 0640 config/example/node-control.yaml debian/frostfs-storage/etc/frostfs/storage/control.yml
-
-override_dh_installsystemd:
-	dh_installsystemd --no-enable --no-start --name=frostfs-ir
-	dh_installsystemd --no-enable --no-start --name=frostfs-storage
-
-override_dh_installchangelogs:
-	dh_installchangelogs -k CHANGELOG.md
-
-override_dh_installdocs:
-	dh_installdocs

debian/source/format

@@ -1 +0,0 @@
-3.0 (quilt)

docs/building-deb-package.md

@@ -1,46 +0,0 @@
-# Building Debian package on host
-
-## Prerequisites
-
-For now, we're assuming building for Debian 11 (stable) x86_64.
-
-Go version 18.4 or later should already be installed, i.e. this runs
-successfully:
-
-* `make all`
-
-## Installing packaging dependencies
-
-```shell
-$ sudo apt install debhelper-compat dh-sequence-bash-completion devscripts
-```
-
-Warining: number of package installed is pretty large considering dependecies.
-
-## Package building
-
-```shell
-$ make debpackage
-```
-
-## Leftovers cleaning
-
-```shell
-$ make debclean
-```
-or
-```shell
-$ dh clean
-```
-
-# Package versioning
-
-By default, package version is based on product version and may also contain git
-tags and hashes.
-
-Package version could be overwritten by setting `PKG_VERSION` variable before
-build, Debian package versioning rules should be respected.
-
-```shell
-$ PKG_VERSION=0.32.0 make debpackge
-```

docs/release-instruction.md

@@ -43,11 +43,6 @@ Write new revision number into the root `VERSION` file:
 $ echo ${FROSTFS_TAG_PREFIX}${FROSTFS_REVISION} > VERSION
 ```
 
-Update version in Debian package changelog file
-```
-$ cat debian/changelog
-```
-
 Update the supported version of `TrueCloudLab/frostfs-contract` module in root
 `README.md` if needed.
 

pkg/services/object_manager/placement/traverser.go

@@ -65,7 +65,10 @@ type cfg struct {
 	nodeState NodeState
 }
 
-const invalidOptsMsg = "invalid traverser options"
+const (
+	invalidOptsMsg = "invalid traverser options"
+	uint16Bytes    = 2
+)
 
 var errNilBuilder = errors.New("placement builder is nil")
 
@@ -200,7 +203,7 @@ func sortVector(cfg *cfg, unsortedVector []netmap.NodeInfo) ([]netmap.NodeInfo,
 	if err != nil {
 		return nil, err
 	}
-	b := make([]byte, 2)
+	b := make([]byte, uint16Bytes)
 	for i := range unsortedVector {
 		for _, m := range cfg.metrics {
 			metrics[i] = append(metrics[i], m.CalculateValue(&node, &unsortedVector[i])...)
@@ -208,7 +211,7 @@ func sortVector(cfg *cfg, unsortedVector []netmap.NodeInfo) ([]netmap.NodeInfo,
 		binary.LittleEndian.PutUint16(b, uint16(i))
 		metrics[i] = append(metrics[i], b...)
 	}
-	count := len(metrics[0]) - 2
+	count := len(metrics[0]) - uint16Bytes
 	slices.SortFunc(metrics, func(a, b []byte) int {
 		return bytes.Compare(a[:count], b[:count])
 	})