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+ id 1WrSdi-0005uz-Rf; Mon, 02 Jun 2014 14:51:03 +0100\r
+From: Mark Walters <markwalters1009@gmail.com>\r
+To: Vladimir Marek <Vladimir.Marek@oracle.com>, notmuch@notmuchmail.org\r
+Subject: Re: Deduplication ?\r
+In-Reply-To: <20140602123212.GA12639@virt.cz.oracle.com>\r
+References: <20140602123212.GA12639@virt.cz.oracle.com>\r
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+Date: Mon, 02 Jun 2014 14:51:01 +0100\r
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+\r
+\r
+Vladimir Marek <Vladimir.Marek@oracle.com> writes:\r
+\r
+> Hi,\r
+>\r
+> I want to import bigger chunk of archived messages into my notmuch\r
+> database. It's about 100k messages. The problem is, that I most probably\r
+> have quite a lot of those messages in the DB. Basically I would like to\r
+> add only those I don't have already.\r
+>\r
+> There are two possibilities\r
+>\r
+> a) I will add all the 100k messages and then remove the duplicities.\r
+>\r
+> b) I will write a script which will parse the message ID's of the\r
+> to-be-added messages and try to match them to the notmuch DB. Adding\r
+> only files I can't find already.\r
+>\r
+> Ad b) might be better option, but I started to play with the idea of\r
+> deduplication. I'm thinking about listing all the message IDs stored in\r
+> DB, listing all files belonging to the IDs and deleting all but one.\r
+> Also I'm thinking about implementing some simple algorithm telling me\r
+> whether the messages are really very similar. Just to be sure I don't\r
+> delete something I don't want to.\r
+>\r
+> Was anyone playing with the idea?\r
+\r
+I am not sure what your use case is but notmuch automatically\r
+deduplicates: that is if the message-id is one it has already seen no\r
+further indexing takes place. The only thing that happens is the new\r
+filename gets added to the list of filenames for the message.\r
+\r
+Thus importing should be almost as fast as if the message were not\r
+there, and the database should be almost identical to what you would get\r
+if you only imported the genuine new messages.\r
+\r
+If you want to save disk space then you could delete the duplicates\r
+after with something like\r
+\r
+notmuch search --output=files --format=text0 --duplicate=2 '*' piped to\r
+xargs -0\r
+\r
+(but please test it carefully first!)\r
+\r
+I would think something like this is better than trying to parse the\r
+message-ids yourself.\r
+\r
+Best wishes\r
+\r
+Mark\r
+\r
+\r
+>\r
+> -- \r
+> Vlad\r
+> _______________________________________________\r
+> notmuch mailing list\r
+> notmuch@notmuchmail.org\r
+> http://notmuchmail.org/mailman/listinfo/notmuch\r
projects / notmuch-archives.git / commitdiff