Re: Quick question about compaction progress

Thank you Jeff Regards, Nitan Cell: 510 449 9629 > On Jan 23, 2019, at 10:13 AM, Jeff Jirsa wrote: > > > >> On Jan 23, 2019, at 8:00 AM, Nitan Kainth wrote: >> >> Hi, >> >> Why does nodetool compactionstats not show time remaining when >> compactionthroughput is set to 0? > > Because

Re: Quick question about compaction progress

> On Jan 23, 2019, at 8:00 AM, Nitan Kainth wrote: > > Hi, > > Why does nodetool compactionstats not show time remaining when > compactionthroughput is set to 0? Because we don’t have a good estimate if we’re not throttling (could be added, just not tracked now) > > If the node is

Re: Quick question on TWCS

Full repair on TWCS maintains proper bucketing -- Jeff Jirsa > On Jan 9, 2018, at 5:36 PM, "wxn...@zjqunshuo.com" > wrote: > > Hi All, > If using TWCS, will a full repair trigger major compaction and then compact > all the sstable files into big ones no matter the

Re: Quick question to config Prometheus to monitor Cassandra cluster

Petrus & Kiran, Thank you for the guide and suggestions. I will have a try. Cheers, Simon From: Petrus Gomes Date: 2017-07-21 00:45 To: user Subject: Re: Quick question to config Prometheus to monitor Cassandra cluster I use the same environment. Follow a few links: Use this link, is the

Re: Quick question to config Prometheus to monitor Cassandra cluster

I use the same environment. Follow a few links: Use this link, is the best one to connect Cassandra and prometheus: https://www.robustperception.io/monitoring-cassandra-with-prometheus/ JMX agent: https://github.com/nabto/cassandra-prometheus

Re: Quick question to config Prometheus to monitor Cassandra cluster

You have to download the Prometheus HTTP jmx dependencies jar and download the Cassandra yaml and mention the jmx port in the config (7199). Run the agent on specific port" on all the Cassandra nodes. After this go to your Prometheus server and make the scrape config to metrics from all clients.

Re: Quick question to config Prometheus to monitor Cassandra cluster

You have to download the Prometheus HTTP jmx dependencies jar and download the Cassandra yaml and mention the jmx port in the config (7199). Run the agent on specific port" on all the Cassandra nodes. After this go to your Prometheus server and make the scrape config to metrics from all clients.

Re: quick question

Adding dev only for this thread. On Wed, Feb 1, 2017 at 4:39 AM, Kant Kodali wrote: > What is the difference between accepting a value and committing a value? > > > > On Wed, Feb 1, 2017 at 4:25 AM, Kant Kodali wrote: > >> Hi, >> >> Thanks for the

Re: quick question

What is the difference between accepting a value and committing a value? On Wed, Feb 1, 2017 at 4:25 AM, Kant Kodali wrote: > Hi, > > Thanks for the response. I finished watching this video but I still got > few questions. > > 1) The speaker seems to suggest that there are

Re: quick question

Hi, Thanks for the response. I finished watching this video but I still got few questions. 1) The speaker seems to suggest that there are different consistency levels being used in different phases of paxos protocol. If so, what is right consistency level to set on these phases? 2) Right now,

Re: quick question

Hi, I believe that this talk from Christopher Batey at the Cassandra Summit 2016 might answer most of your questions around LWT: https://www.youtube.com/watch?v=wcxQM3ZN20c He explains a lot of stuff including consistency considerations. My understanding is that the quorum read can only see the

Re: quick question

I mean disk/cpu/network usage but I understand what Dynamic snitch does! On Wed, Oct 19, 2016 at 3:34 AM, Vladimir Yudovin wrote: > What exactly do you mean by "resource usage"? If you mean "data size on > disk" - no. > If you mean "current CPU usage" - it depends on

Re: quick question

What exactly do you mean by "resource usage"? If you mean "data size on disk" - no. If you mean "current CPU usage" - it depends on query. Modify query should be be sent to all nodes owning specific partition key. For read queries see

Re: quick question

The coordinator can optimize latency for a SELECT by asking data from the lowest-latency replica using DynamicSnitch. It's not really load balancing per se but it's the closest idea.

Re: quick question on seed nodes configuration

I had seed nodes ip1,ip2,ip3 as the seeds but what I didn't realize was then that these nodes had themselves as seeds. I am assuming that should never be done, is that correct. The only reason nodes listing them selves as seeds can be a pain is during bootstrap. Seeds nodes will not

Re: quick question on seed nodes configuration

Hi , The seeds are only used when a node appears in the cluster. At this moment it chooses a seed (in the same dc) in order to have some information. So, the most secure way is to write all your other nodes as seed, but in fact you need only one up. if you think that you will never have 3 node

Re: quick question about data layout on disk

So how does that work? An sstable is for a single CF, but it can and likely will have multiple rows. There is no read to write and as I understand it, writes are append operations. So if you have an sstable with say 26 different rows (A-Z) already in it with a bunch of columns and you add a new

Re: quick question about data layout on disk

Aaron, I have not deep dived the data files in a while but this is how I understand it. http://wiki.apache.org/cassandra/ArchitectureSSTable There is no need to store the row key each time with the column. RowKey to columns is a one to many relationship. This would be a diagram of a physical

Re: quick question about data layout on disk

Thanks Russell, that's the info I was looking for! On Sat, Aug 11, 2012 at 11:23 AM, Russell Haering russellhaer...@gmail.com wrote: Your update doesn't go directly to an sstable (which are immutable), it is first merged to an in-memory table. Eventually the memtable is flushed to a new

Re: quick question about data layout on disk

Rowkey is stored only once in any sstable file. That is, in the spesial case where you get sstable file per column/value, you are correct, but normally, I guess most of us are storing more per key. Regards, Terje On 11 Aug 2012, at 10:34, Aaron Turner synfina...@gmail.com wrote: Curious, but

Re: quick question about super columns

Thanks. got it! On Sat, Jan 8, 2011 at 9:44 PM, Tyler Hobbs ty...@riptano.com wrote: A couple of alternatives off the top of my head: 1) A row of supercolumns becomes a row of standard columns with compound column names. 2) A row of N supercolumns becomes N rows of standard columns (with

Re: quick question about super columns

An important bit to read about supercolumn limitations: http://www.riptano.com/docs/0.6/data_model/supercolumns#limitations Don't make supercolumns with a huge number of subcolumns (or a few really large subcolumns) unless you plan to always read all of them at once. - Tyler On Fri, Jan 7, 2011

Re: quick question about super columns

Thank you. And is it similar if I want to search a subcolumn within a given supercolumn? I mean I have the supercolumn key and the subcolumn key - can I fetch the particular subcolumn? Can you share a small piece of example code for both? I'm still new into this and trying to figure out the

Re: quick question about super columns

On Fri, Jan 7, 2011 at 12:12 PM, Arijit Mukherjee ariji...@gmail.comwrote: Thank you. And is it similar if I want to search a subcolumn within a given supercolumn? I mean I have the supercolumn key and the subcolumn key - can I fetch the particular subcolumn? Can you share a small piece of

Re: quick question about super columns

With raw thrift APIs: 1. Fetch column from supercolumn: ColumnPath cp = new ColumnPath(ColumnFamily); cp.setSuper_column(SuperColumnName); cp.setColumn(ColumnName); ColumnOrSuperColumn resp = client.get(getByteBuffer(RowKey), cp, ConsistencyLevel.ONE); Column c = resp.getColumn(); 2. Add a new