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authorLars Wirzenius <liw@liw.fi>2016-02-20 22:10:13 +0200
committerLars Wirzenius <liw@liw.fi>2016-02-20 22:10:13 +0200
commit8c087e41fdda5d9508b9c95ea57fbd079142633d (patch)
tree44bbbcec3aac27d6ca26d498ac1b4f77ae15c190 /tickets/8df68737194d4fda872886ac1398485b
parentea12bbd09cf9e03d4b50f139f55925aad10dcec0 (diff)
downloadobnam-dev-distix-8c087e41fdda5d9508b9c95ea57fbd079142633d.tar.gz
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diff --git a/tickets/8df68737194d4fda872886ac1398485b/Maildir/new/.this-dir-not-empty/.empty/empty-file b/tickets/8df68737194d4fda872886ac1398485b/Maildir/new/.this-dir-not-empty/.empty/empty-file
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diff --git a/tickets/8df68737194d4fda872886ac1398485b/Maildir/new/1455999009.M394505P17339Q199.exolobe1 b/tickets/8df68737194d4fda872886ac1398485b/Maildir/new/1455999009.M394505P17339Q199.exolobe1
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+++ b/tickets/8df68737194d4fda872886ac1398485b/Maildir/new/1455999009.M394505P17339Q199.exolobe1
@@ -0,0 +1,115 @@
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+Message-ID: <CAJQvAufu-qnC=nrR87XN3fkHu6K7p3-Hu5A71GL+uXZ8EKCaUw@mail.gmail.com>
+From: Henri Sivonen <hsivonen@hsivonen.fi>
+To: obnam-dev@obnam.org
+Content-Type: text/plain; charset=UTF-8
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+Subject: Enhancement: Avoid storing compressed data when compression would
+ expand data
+X-BeenThere: obnam-dev@obnam.org
+X-Mailman-Version: 2.1.5
+Precedence: list
+List-Id: Obnam development discussions <obnam-dev-obnam.org>
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+ <mailto:obnam-dev-request@obnam.org?subject=unsubscribe>
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+Errors-To: obnam-dev-bounces@obnam.org
+
+I have made a minor improvement to avoid storing compressed data even
+when compression has been enabled in cases where compression (plus
+tagging) would end up expanding the data. This avoids space waste upon
+transfer and storage and compute waste upon reading.
+
+The change is available for pulling from the "no-expansion" branch of
+the repo https://github.com/hsivonen/obnam.git (the branch contains
+nothing else). Web view of the changeset:
+https://github.com/hsivonen/obnam/commit/5002965ad28c89a08c370efa880a060cf7835dbd
+Patch format:
+https://github.com/hsivonen/obnam/commit/5002965ad28c89a08c370efa880a060cf7835dbd.patch
+
+I have tested the patch manually with a directory containing two files
+generated with
+$ head -c 1024 /dev/urandom > rand
+$ head -c 1024 /dev/zero > zero
+(rand doesn't compress and zero compresses very well.)
+
+However, I'm currently unfamiliar with the workings of yarn, so I
+haven't added automated tests. If the patch isn't acceptable without
+tests, I'd appreciate advice on how to do the kind of testing that
+looks inside the chunk data stored in the repo.
+
+--
+Henri Sivonen
+hsivonen@hsivonen.fi
+https://hsivonen.fi/
+
+_______________________________________________
+obnam-dev mailing list
+obnam-dev@obnam.org
+http://listmaster.pepperfish.net/cgi-bin/mailman/listinfo/obnam-dev-obnam.org
diff --git a/tickets/8df68737194d4fda872886ac1398485b/Maildir/new/1455999009.M427716P17339Q200.exolobe1 b/tickets/8df68737194d4fda872886ac1398485b/Maildir/new/1455999009.M427716P17339Q200.exolobe1
new file mode 100644
index 0000000..1c6ce4d
--- /dev/null
+++ b/tickets/8df68737194d4fda872886ac1398485b/Maildir/new/1455999009.M427716P17339Q200.exolobe1
@@ -0,0 +1,115 @@
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+Message-ID: <CAJQvAufu-qnC=nrR87XN3fkHu6K7p3-Hu5A71GL+uXZ8EKCaUw@mail.gmail.com>
+From: Henri Sivonen <hsivonen@hsivonen.fi>
+To: obnam-dev@obnam.org
+Content-Type: text/plain; charset=UTF-8
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+Subject: Enhancement: Avoid storing compressed data when compression would
+ expand data
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+X-Mailman-Version: 2.1.5
+Precedence: list
+List-Id: Obnam development discussions <obnam-dev-obnam.org>
+List-Unsubscribe: <http://listmaster.pepperfish.net/cgi-bin/mailman/listinfo/obnam-dev-obnam.org>,
+ <mailto:obnam-dev-request@obnam.org?subject=unsubscribe>
+List-Archive: <http://listmaster.pepperfish.net/pipermail/obnam-dev-obnam.org>
+List-Post: <mailto:obnam-dev@obnam.org>
+List-Help: <mailto:obnam-dev-request@obnam.org?subject=help>
+List-Subscribe: <http://listmaster.pepperfish.net/cgi-bin/mailman/listinfo/obnam-dev-obnam.org>,
+ <mailto:obnam-dev-request@obnam.org?subject=subscribe>
+Sender: obnam-dev-bounces@obnam.org
+Errors-To: obnam-dev-bounces@obnam.org
+
+I have made a minor improvement to avoid storing compressed data even
+when compression has been enabled in cases where compression (plus
+tagging) would end up expanding the data. This avoids space waste upon
+transfer and storage and compute waste upon reading.
+
+The change is available for pulling from the "no-expansion" branch of
+the repo https://github.com/hsivonen/obnam.git (the branch contains
+nothing else). Web view of the changeset:
+https://github.com/hsivonen/obnam/commit/5002965ad28c89a08c370efa880a060cf7835dbd
+Patch format:
+https://github.com/hsivonen/obnam/commit/5002965ad28c89a08c370efa880a060cf7835dbd.patch
+
+I have tested the patch manually with a directory containing two files
+generated with
+$ head -c 1024 /dev/urandom > rand
+$ head -c 1024 /dev/zero > zero
+(rand doesn't compress and zero compresses very well.)
+
+However, I'm currently unfamiliar with the workings of yarn, so I
+haven't added automated tests. If the patch isn't acceptable without
+tests, I'd appreciate advice on how to do the kind of testing that
+looks inside the chunk data stored in the repo.
+
+--
+Henri Sivonen
+hsivonen@hsivonen.fi
+https://hsivonen.fi/
+
+_______________________________________________
+obnam-dev mailing list
+obnam-dev@obnam.org
+http://listmaster.pepperfish.net/cgi-bin/mailman/listinfo/obnam-dev-obnam.org
diff --git a/tickets/8df68737194d4fda872886ac1398485b/Maildir/new/1455999009.M439127P17339Q201.exolobe1 b/tickets/8df68737194d4fda872886ac1398485b/Maildir/new/1455999009.M439127P17339Q201.exolobe1
new file mode 100644
index 0000000..2dabb95
--- /dev/null
+++ b/tickets/8df68737194d4fda872886ac1398485b/Maildir/new/1455999009.M439127P17339Q201.exolobe1
@@ -0,0 +1,116 @@
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+Date: Mon, 19 Oct 2015 22:20:22 +0300
+From: Lars Wirzenius <liw@liw.fi>
+To: Henri Sivonen <hsivonen@hsivonen.fi>
+Message-ID: <20151019192022.GK2563@exolobe1.liw.fi>
+References: <CAJQvAufu-qnC=nrR87XN3fkHu6K7p3-Hu5A71GL+uXZ8EKCaUw@mail.gmail.com>
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+Subject: Re: Enhancement: Avoid storing compressed data when compression
+ would expand data
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+List-Id: Obnam development discussions <obnam-dev-obnam.org>
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+ <mailto:obnam-dev-request@obnam.org?subject=unsubscribe>
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+List-Subscribe: <http://listmaster.pepperfish.net/cgi-bin/mailman/listinfo/obnam-dev-obnam.org>,
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+Sender: obnam-dev-bounces@obnam.org
+Errors-To: obnam-dev-bounces@obnam.org
+
+Applied, thanks.
+
+On Sat, Oct 17, 2015 at 08:54:50PM +0300, Henri Sivonen wrote:
+> I have made a minor improvement to avoid storing compressed data even
+> when compression has been enabled in cases where compression (plus
+> tagging) would end up expanding the data. This avoids space waste upon
+> transfer and storage and compute waste upon reading.
+>
+> The change is available for pulling from the "no-expansion" branch of
+> the repo https://github.com/hsivonen/obnam.git (the branch contains
+> nothing else). Web view of the changeset:
+> https://github.com/hsivonen/obnam/commit/5002965ad28c89a08c370efa880a060cf7835dbd
+> Patch format:
+> https://github.com/hsivonen/obnam/commit/5002965ad28c89a08c370efa880a060cf7835dbd.patch
+>
+> I have tested the patch manually with a directory containing two files
+> generated with
+> $ head -c 1024 /dev/urandom > rand
+> $ head -c 1024 /dev/zero > zero
+> (rand doesn't compress and zero compresses very well.)
+>
+> However, I'm currently unfamiliar with the workings of yarn, so I
+> haven't added automated tests. If the patch isn't acceptable without
+> tests, I'd appreciate advice on how to do the kind of testing that
+> looks inside the chunk data stored in the repo.
+>
+> --
+> Henri Sivonen
+> hsivonen@hsivonen.fi
+> https://hsivonen.fi/
+>
+> _______________________________________________
+> obnam-dev mailing list
+> obnam-dev@obnam.org
+> http://listmaster.pepperfish.net/cgi-bin/mailman/listinfo/obnam-dev-obnam.org
+>
+
+--
+Schrödinger's backup hypothesis: the condition of any backup is
+undefined until a restore is attempted. -- andrewsh
+
+_______________________________________________
+obnam-dev mailing list
+obnam-dev@obnam.org
+http://listmaster.pepperfish.net/cgi-bin/mailman/listinfo/obnam-dev-obnam.org
diff --git a/tickets/8df68737194d4fda872886ac1398485b/Maildir/tmp/.this-dir-not-empty/.empty/empty-file b/tickets/8df68737194d4fda872886ac1398485b/Maildir/tmp/.this-dir-not-empty/.empty/empty-file
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tickets/8df68737194d4fda872886ac1398485b/Maildir/tmp/.this-dir-not-empty/.empty/empty-file
diff --git a/tickets/8df68737194d4fda872886ac1398485b/ticket.yaml b/tickets/8df68737194d4fda872886ac1398485b/ticket.yaml
new file mode 100644
index 0000000..bba9a75
--- /dev/null
+++ b/tickets/8df68737194d4fda872886ac1398485b/ticket.yaml
@@ -0,0 +1,4 @@
+ticket-id:
+- 8df68737194d4fda872886ac1398485b
+title:
+- "Enhancement: Avoid storing compressed data when compression would\n expand data"