Re: Replacing a dead node in Cassandra 2.0.8
I read some additional threads concerning outdated snapshots and deleted data so if the VM snapshot is older than gc_grace_seconds I suppose that data deleted meanwhile for which the tombstones have been removed would come back to life again if I just restore the VM from a snapshot being older than gc_grace_seconds. So after restoring the VM snapshot I should make sure Cassandra doesn’t start up automatically with the outdated snapshot data. Then I could 1)either startup the node with the replace_address option (do I still need to clear data directories first to avoid that deleted data comes back to life again?) 2) restore a Cassandra snapshot being not older than gc_grace_seconds by physically replacing SSTables in the data directory (did I get it right that the node must be up for running StorageService or sstableloader?) and run nodetool repair afterwards. Is this correct? tsi wrote OK, now supposing Cassandra is run in a VM that crashes and I restore it from a snapshot done some time ago. Data is stored redundantly (replication factor 3) and I'm using consistency level QUORUM for reads and writes. That means no data should be lost as the latest data will at least be stored on another node. Now what do I have to do to sync the dead node again after restoring the VM from the snapshot? Will a nodetool repair command be sufficient? -- View this message in context: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Replacing-a-dead-node-in-Cassandra-2-0-8-tp7596245p7596454.html Sent from the cassandra-u...@incubator.apache.org mailing list archive at Nabble.com.
[RELEASE] Apache Cassandra 2.0.10 released
The Cassandra team is pleased to announce the release of Apache Cassandra version 2.0.10. Apache Cassandra is a fully distributed database. It is the right choice when you need scalability and high availability without compromising performance. http://cassandra.apache.org/ Downloads of source and binary distributions are listed in our download section: http://cassandra.apache.org/download/ This version is a bug fix release[1] on the 2.0 series. As always, please pay attention to the release notes[2] and Let us know[3] if you were to encounter any problem. Enjoy! [1]: http://goo.gl/FNcwyk (CHANGES.txt) [2]: http://goo.gl/NLVXwb (NEWS.txt) [3]: https://issues.apache.org/jira/browse/CASSANDRA
Re: How to free disk space after decreasing replication factor?
On Sat, Aug 23, 2014 at 8:20 PM, Yatong Zhang bluefl...@gmail.com wrote: I am using leveled compaction and I changed the replication factor from 3 to 2, but after a few days the disk space weren't freed. I tried to trigger the compaction or clean up, but looks like it didn't take any effect. nodetool cleanup Is for the case where your nodes are no longer responsible for ranges they used to be responsible for, as in reducing replication factor. =Rob
[no subject]
We're using cassandra 2.0.9 with datastax java cassandra driver 2.0.0 in a cluster of eight nodes. We're doing an insert and after a delete like: delete from *column_family_name* where *id* = value Immediatly select to check whether the DELETE was successful. Sometimes the value still there!! Any suggestions? -- Atenciosamente, Sávio S. Teles de Oliveira voice: +55 62 9136 6996 http://br.linkedin.com/in/savioteles Mestrando em Ciências da Computação - UFG Arquiteto de Software CUIA Internet Brasil
Re:
On Mon, Aug 25, 2014 at 1:25 PM, Sávio S. Teles de Oliveira savio.te...@cuia.com.br wrote: We're using cassandra 2.0.9 with datastax java cassandra driver 2.0.0 in a cluster of eight nodes. We're doing an insert and after a delete like: delete from *column_family_name* where *id* = value Immediatly select to check whether the DELETE was successful. Sometimes the value still there!! What are Replication Factor (RF) and Consistency Level (CL)? =Rob
Re:
It sounds like your clocks are out of sync. Run ntpdate to fix your clock then make sure you're running ntpd on every machine. On Mon, Aug 25, 2014 at 1:25 PM, Sávio S. Teles de Oliveira savio.te...@cuia.com.br wrote: We're using cassandra 2.0.9 with datastax java cassandra driver 2.0.0 in a cluster of eight nodes. We're doing an insert and after a delete like: delete from column_family_name where id = value Immediatly select to check whether the DELETE was successful. Sometimes the value still there!! Any suggestions? -- Atenciosamente, Sávio S. Teles de Oliveira voice: +55 62 9136 6996 http://br.linkedin.com/in/savioteles Mestrando em Ciências da Computação - UFG Arquiteto de Software CUIA Internet Brasil -- Jon Haddad http://www.rustyrazorblade.com twitter: rustyrazorblade
Re:
This is actually a more correct response than mine, I made a few assumptions that may or may not be true. On Mon, Aug 25, 2014 at 1:31 PM, Robert Coli rc...@eventbrite.com wrote: On Mon, Aug 25, 2014 at 1:25 PM, Sávio S. Teles de Oliveira savio.te...@cuia.com.br wrote: We're using cassandra 2.0.9 with datastax java cassandra driver 2.0.0 in a cluster of eight nodes. We're doing an insert and after a delete like: delete from column_family_name where id = value Immediatly select to check whether the DELETE was successful. Sometimes the value still there!! What are Replication Factor (RF) and Consistency Level (CL)? =Rob -- Jon Haddad http://www.rustyrazorblade.com twitter: rustyrazorblade
OpsCenter_rollups*
Hi, I see a lot of activity around the OpsCenter_rollups CFs in the logs. Why is there so much OpsCenter work happening? Is there a way to disable it, and whats the impact? Ruchir.
Re:
RF=1 and CF=ONE. The clocks were sync. It was my first assumption. 2014-08-25 17:36 GMT-03:00 Jonathan Haddad j...@jonhaddad.com: This is actually a more correct response than mine, I made a few assumptions that may or may not be true. On Mon, Aug 25, 2014 at 1:31 PM, Robert Coli rc...@eventbrite.com wrote: On Mon, Aug 25, 2014 at 1:25 PM, Sávio S. Teles de Oliveira savio.te...@cuia.com.br wrote: We're using cassandra 2.0.9 with datastax java cassandra driver 2.0.0 in a cluster of eight nodes. We're doing an insert and after a delete like: delete from column_family_name where id = value Immediatly select to check whether the DELETE was successful. Sometimes the value still there!! What are Replication Factor (RF) and Consistency Level (CL)? =Rob -- Jon Haddad http://www.rustyrazorblade.com twitter: rustyrazorblade -- Atenciosamente, Sávio S. Teles de Oliveira voice: +55 62 9136 6996 http://br.linkedin.com/in/savioteles Mestrando em Ciências da Computação - UFG Arquiteto de Software CUIA Internet Brasil
Re:
On Mon, Aug 25, 2014 at 2:16 PM, Sávio S. Teles de Oliveira savio.te...@cuia.com.br wrote: RF=1 and CF=ONE. With RF=1 and CL=ONE, I do not personally understand a scenario in which a read at T2 reads an item which was deleted at T1. If you have a trivial repro case, I suggest filing a JIRA ticket and letting the list know its URL. =Rob
Re: OpsCenter_rollups*
On Mon, Aug 25, 2014 at 1:42 PM, Ruchir Jha ruchir@gmail.com wrote: I see a lot of activity around the OpsCenter_rollups CFs in the logs. Why is there so much OpsCenter work happening? Is there a way to disable it, and whats the impact? Opscenter is tracking the metrics for your cluster and storing the tracking data... in your cluster. This would generally seem to not make a whole lot of sense, but there you have it. There is probably a way to disable the stats collection part of OpsCenter, but that's presumably part of the value add of OpsCenter. =Rob
