Re: BDB vs FSFS - OMG!
From: C. Michael Pilato <cmpilato_at_collab.net>
Date: Mon, 7 Jan 2013 11:02:50 -0500
On 01/07/2013 10:07 AM, Branko Čibej wrote:
DISCLAIMER: I've always assumed that moving incrementally forward towards
--- Speaking personally, I am all for stopping the support of BDB eventually. But unless you have some really unique work habits, any time you are really spending on BDB today is done in backgroundable tasks -- regression test suite runs, primarily. That's hardly a serious time investment, and certainly not the sort that's keeping anyone from doing sexy new work. If we're going to force existing BDB users onto something else, they should expect real benefit from that change. I don't want their decision-making to boil down to choosing amongst a) enduring a dump/load process for no perceivable benefit, b) sticking with an old Subversion indefinitely, or c) just bailing to another VC system. And while the kinds of performance numbers folks have thrown up comparing the backends are interesting, I guess I've not yet seen a case made for FS performance being a serious bottleneck in real-world deployment scenarios (where networks, SSL, server load, etc. are involved). Is it the case that 'svn update' or 'svn merge' over HTTP from the moderately active Subversion server sitting in the corporate data center is noticeably slower with one backend versus the other? The Berkeley DB backend does have a finite lifespan, the end of which is (hopefully) approaching. But I submit that the appropriate time to pull the plug is when we introduce a compatibility-breaking new FS concept -- the sort that would force a dump/load from both BDB and FSFS and a major bump in Subversion's release numbering -- which offers meaningful feature additions. I *think* that no one here is proposing that we actually drop BDB support prior to such a moment in Subversion's evolution, but my concern is that the "Deprecated" labeling will amount to FUD which scares BDB users into a dump/load just to get onto FSFS, only to find that in the next release of Subversion those same users are asked to dump/load again to get onto FSv2 (or FSFSv7, or TheNextBigFSThang, ...). -- C. Michael Pilato <cmpilato_at_collab.net> CollabNet <> www.collab.net <> Enterprise Cloud Development
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