tag:blogger.com,1999:blog-8436330762136344379.post1352132029630373130..comments2024-03-29T03:33:17.674-04:00Comments on Metadata: Hybrid Logical ClocksMurathttp://www.blogger.com/profile/07842046940394980130noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-8436330762136344379.post-61247754910066865842017-05-10T16:55:43.050-04:002017-05-10T16:55:43.050-04:00One small correction:
> ... in a geographically...One small correction:<br />> ... in a geographically distributed system obtaining precise clock synchronization is very hard ...<br /><br />It's not just very hard, it's theoretically impossible, according to special relativity, to perfectly synchronize any two clocks. There will always be some intervals of uncertainty.<br /><br />If it was possible, then it would be also possible to measure speed of light in one direction. But in reality we can only measure the time it takes for the light to go there _and_ back. See Poincaré–Einstein synchronization.<br /><br />And general relativity makes things only harder.dlazerkahttps://www.blogger.com/profile/03511500065443755596noreply@blogger.comtag:blogger.com,1999:blog-8436330762136344379.post-68713451669560809462015-06-12T04:19:39.059-04:002015-06-12T04:19:39.059-04:00No one seems to know if this page even exists.
An...No one seems to know if this page even exists.<br /><br />And the cockroaches are making millions out of it! hehshttps://www.blogger.com/profile/00202551848342347205noreply@blogger.comtag:blogger.com,1999:blog-8436330762136344379.post-82389693359900802852015-06-04T14:50:50.939-04:002015-06-04T14:50:50.939-04:00I can't quite figure out why databases like Sp...I can't quite figure out why databases like Spanner & Cockroachdb order transactions with timestamps vs a global paxos commit log like Calvin/CalvinFS. How do timestamps deal with nodes that just submit their transactions slowly, so that you don't slow down all the commits because of a few slow nodes.Jim Hurdhttps://www.blogger.com/profile/10640509391777504366noreply@blogger.com