> We can always be proactive in keeping the time sync. But, Is there any way to > recover from a time drift (in a reactive manner)? Since it was a lab > environment, I dropped the KS (deleted data directory) There is a way to remove future dated columns, but it not for the faint hearted.
Basically: 1) Drop the gc_grace_seconds to 0 2) Delete the column with a timestamp way in the future, so it is guaranteed to be higher than the value you want to delete. 3) Flush the CF 4) Compact all the SSTables that contain the row. The easiest way to do that is a major compaction, but we normally advise not to do that because it creates one big file. You can also do a user defined compaction. > Are there any other scenarios that would lead a cluster look like below? > Note:Actual topology of the cluster - ONE Cassandra node and TWO Analytic > nodes. What snitch are you using? If you have the property file snitch do all nodes have the same configuration ? There is a lot of sickness there. If possible I would scrub and start again. Cheers ----------------- Aaron Morton Freelance Cassandra Developer New Zealand @aaronmorton http://www.thelastpickle.com On 29/01/2013, at 6:29 AM, S C <as...@outlook.com> wrote: > One of our node in a 3 node cluster drifted by ~ 20-25 seconds. While I > figured this pretty quickly, I had few questions that am looking for some > answers. > > We can always be proactive in keeping the time sync. But, Is there any way to > recover from a time drift (in a reactive manner)? Since it was a lab > environment, I dropped the KS (deleted data directory). > Are there any other scenarios that would lead a cluster look like below? > Note:Actual topology of the cluster - ONE Cassandra node and TWO Analytic > nodes. > > > On 192.168.2.100 > Address DC Rack Status State Load Owns > Token > > 113427455640312821154458202477256070485 > 192.168.2.100 Cassandra rack1 Up Normal 601.34 MB 33.33% > 0 > 192.168.2.101 Analytics rack1 Down Normal 149.75 MB 33.33% > 56713727820156410577229101238628035242 > 192.168.2.102 Analytics rack1 Down Normal ? 33.33% > 113427455640312821154458202477256070485 > > On 192.168.2.101 > Address DC Rack Status State Load Owns > Token > > 113427455640312821154458202477256070485 > 192.168.2.100 Analytics rack1 Down Normal ? 33.33% > 0 > 192.168.2.101 Analytics rack1 Up Normal 158.59 MB 33.33% > 56713727820156410577229101238628035242 > 192.168.2.102 Analytics rack1 Down Normal ? 33.33% > 113427455640312821154458202477256070485 > > On 192.168.2.102 > Address DC Rack Status State Load Owns > Token > > 113427455640312821154458202477256070485 > 192.168.2.100 Analytics rack1 Down Normal ? 33.33% > 0 > 192.168.2.101 Analytics rack1 Down Normal ? 33.33% > 56713727820156410577229101238628035242 > 192.168.2.102 Analytics rack1 Up Normal 117.02 MB 33.33% > 113427455640312821154458202477256070485 > > > Appreciate your valuable inputs. > > Thanks, > SC
