From patchwork Mon Sep 18 17:59:35 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Derrick Stolee via GitGitGadget X-Patchwork-Id: 13390208 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 874D3CD37B0 for ; Mon, 18 Sep 2023 17:59:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229518AbjIRR7t (ORCPT ); Mon, 18 Sep 2023 13:59:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60306 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229614AbjIRR7s (ORCPT ); Mon, 18 Sep 2023 13:59:48 -0400 Received: from mail-wm1-x334.google.com (mail-wm1-x334.google.com [IPv6:2a00:1450:4864:20::334]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 68E0E102 for ; Mon, 18 Sep 2023 10:59:41 -0700 (PDT) Received: by mail-wm1-x334.google.com with SMTP id 5b1f17b1804b1-401da71b83cso54569385e9.2 for ; Mon, 18 Sep 2023 10:59:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1695059979; x=1695664779; darn=vger.kernel.org; h=cc:to:mime-version:content-transfer-encoding:fcc:subject:date:from :message-id:from:to:cc:subject:date:message-id:reply-to; bh=Txbj22rs5Mxs5ocx1d7lJCvgSY1TIEUA9ezXzvCOWtM=; b=T9vHln42VifAkgYCy4JfpPM8FQl6HKLQFO6mWQdY7L852T3R6PSw2/8hQqys71Oy/D kC3PTu7qeEACzTJX/iYp9ysynoSic6doiQFoTpGJI/xsAhSX2SIf9iwzE1tCpU6vIj+d 3w/OyawvRYfDufLyLTJm37lCzO/hGwHcMT6PZhSBFbeqsZoKAtMekmvfrBALhKjB1Xmv FC8dlcGauB4XaclNPO3tWFeTL9IwZ4jygfONZQjlJrvHI5VeriT6Kn0sJwxCvIvpTTAC LqtsG3W2OIKWI77hDPCeI5O8hTOJzrc8r/cRatIR4fc/QLDz0py7sigQm0dq/FblcQvM 9Lkg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1695059979; x=1695664779; h=cc:to:mime-version:content-transfer-encoding:fcc:subject:date:from :message-id:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=Txbj22rs5Mxs5ocx1d7lJCvgSY1TIEUA9ezXzvCOWtM=; b=bvFBhEXjgu55PrOsU6rbueTvat68rD1/oSi9+uIalI3KZzsrAXIemyHHT2agpmzQ7m o+QjYjSjWvxBLHUPDv8C2mWDToVCaOAvCjKsmOPxUswvEmBaR7UZ11v6bhTdptf+HSp0 M/itYWmSlr7cwlZhd1F20TdKnSKAo+buYYBYNANppq860RpSW/ZZOMo90d22su/UOoxc Ll5tx8RZOcQtbaNJuO/TnFYOQnIsrvLALo1QsKOnyvNZWxeRpPPvfS8MT1gVxiOxZ7eJ pcQl2MtQV7y/eqWgIl91VmQh1najHp8N+u4KQXo79deQOhqtTZAszzLdlPYmmbNgE4D6 HhIA== X-Gm-Message-State: AOJu0YyMWi6Ui7Hz2XyLsjY1lssFeFHWAaTdOYI3VWUsSI0PnSmEQIwu U0DfXlDMjkOR3YZ2tm+2WpSwqTg1dTc= X-Google-Smtp-Source: AGHT+IGRYBmzPb/83tlM1kGyaCOjMApNQ43JJ8B/bzkQ/jYD1XDVx1C7pWY8fFYhofElckhZTC6b3w== X-Received: by 2002:a05:600c:cc:b0:401:c52c:5ed9 with SMTP id u12-20020a05600c00cc00b00401c52c5ed9mr7980730wmm.32.1695059979302; Mon, 18 Sep 2023 10:59:39 -0700 (PDT) Received: from [127.0.0.1] ([13.74.141.28]) by smtp.gmail.com with ESMTPSA id o16-20020a05600c379000b00401e32b25adsm13219934wmr.4.2023.09.18.10.59.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Sep 2023 10:59:38 -0700 (PDT) Message-ID: From: "Han-Wen Nienhuys via GitGitGadget" Date: Mon, 18 Sep 2023 17:59:35 +0000 Subject: [PATCH 0/3] Simple reftable backend Fcc: Sent MIME-Version: 1.0 To: git@vger.kernel.org Cc: Han-Wen Nienhuys Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org This series comes from a conversation with Patrick Steinhardt at Gitlab, who have an interest in a more scalable ref storage system. I unfortunately don't have business reasons to spend much time on this project anymore, and the original, sweeping migration has too many open questions. I thought of an alternate approach, and I wanted to show it as input to discussions at the contributor summit. I think the first part ("refs: push lock management into packed backend") is a good improvement overall, and could be landed separately without much tweaking. The second part ("refs: alternate reftable ref backend implementation") is something open for discussion: the alternative "packed storage" is based on reftable, but it could conceivably be a different type of database/file format too. I think it's attractive to use reftable here, because over time more data (symrefs, reflog) could be moved into reftable. Han-Wen Nienhuys (3): refs: push lock management into packed backend refs: move is_packed_transaction_needed out of packed-backend.c refs: alternate reftable ref backend implementation Makefile | 1 + config.mak.uname | 2 +- contrib/workdir/git-new-workdir | 2 +- refs.c | 8 + refs/debug.c | 15 + refs/files-backend.c | 182 +++- refs/packed-backend.c | 150 +-- refs/packed-backend.h | 19 - refs/refs-internal.h | 6 + refs/reftable-backend.c | 1745 +++++++++++++++++++++++++++++++ refs/reftable-backend.h | 8 + 11 files changed, 1941 insertions(+), 197 deletions(-) create mode 100644 refs/reftable-backend.c create mode 100644 refs/reftable-backend.h base-commit: bda494f4043963b9ec9a1ecd4b19b7d1cd9a0518 Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-1574%2Fhanwen%2Fsimple-reftable-backend-v1 Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-1574/hanwen/simple-reftable-backend-v1 Pull-Request: https://github.com/git/git/pull/1574