Re: How often are JMX Cassandra metrics reset?

2014-08-28 Thread Chris Lohfink
In the version of metrics used theres a uniform reservoir and a exponentially weighted one. This is used to compute the min, max, mean, std dev and quantiles. For the timers it uses by default it uses the exp. decaying one which is weighted for the last 5 minutes. http://grepcode.com/file/re

RE: How often are JMX Cassandra metrics reset?

2014-08-28 Thread Donald Smith
The metrics OneMinuteRate, FIveMinuteRate, FifteenMinuteRate, and MeanRate are NOT lifetime values but they’re all counts of requests, not latency. The latency values (Max, Count, 50thPercentile, Mean, etc) ARE lifetime values, I think, and thus would seem to be kinda useless for me, since our

Re: Commitlog files are not being deleted

2014-08-28 Thread Robert Coli
On Thu, Aug 28, 2014 at 3:31 PM, Pavel Kogan wrote: > Shouldn't all commitlog files be auto deleted after replaying, for example > after node restart? > Using Cassandra 2.0.8 > No, they're marked clean and recycled. =Rob

Commitlog files are not being deleted

2014-08-28 Thread Pavel Kogan
Hi all, Shouldn't all commitlog files be auto deleted after replaying, for example after node restart? Using Cassandra 2.0.8 Thanks, Pavel

Re: Can't Add AWS Node due to /mnt/cassandra/data directory

2014-08-28 Thread Stephen Portanova
Awesome, thanks Ben! On Wed, Aug 27, 2014 at 9:14 PM, Ben Bromhead wrote: > Make sure you have also setup the ephemeral drives as a raid device (use > mdadm) and mounted it under /mnt/cassandra otherwise your data dir is the > os partition which is usually very small. > > Ben Bromhead > Instacl

Re: How often are JMX Cassandra metrics reset?

2014-08-28 Thread Nick Bailey
Those percentile values should be for the lifetime of the node yes. Depending on what version of OpsCenter you are using it is either using the 'recent' metrics described by Rob, or it is using the FiveMinuteRate from JMX as well as doing some of it's own aggregation depending on the rollup size.

Re: How often are JMX Cassandra metrics reset?

2014-08-28 Thread Robert Coli
On Thu, Aug 28, 2014 at 9:27 AM, Donald Smith < donald.sm...@audiencescience.com> wrote: > And yet OpsCenter shows graphs with ever-changing metrics that show > recent performance. Does OpsCenter not get its stats from JMX? > 1) Certain JMX endpoints expose "recent" metrics, or at least used to.

RE: How often are JMX Cassandra metrics reset?

2014-08-28 Thread Donald Smith
And yet OpsCenter shows graphs with ever-changing metrics that show recent performance. Does OpsCenter not get its stats from JMX? From: Robert Coli [mailto:rc...@eventbrite.com] Sent: Wednesday, August 27, 2014 12:56 PM To: user@cassandra.apache.org Subject: Re: How often are JMX Cassandra metri

Reducing tombstones impact in queue access patterns through rolling shards?

2014-08-28 Thread Jan Algermissen
Hi, I just came across this recipe by Netflix, that addresses the impact of tombstones in queue access patterns with a time based rolling shard to allow compaction to happen in one shard while the other is ‘busy’. (At least this is what understand from the intro) https://github.com/Netflix/ast

PoolTimeoutException while connecting to Cassandra

2014-08-28 Thread Vineet Mishra
Hi All, I have downloaded titan-server-0.4.4 and trying to integrate it with Cassandra as backend datasource. Cassandra is running as external on 4 node machine, now I am trying to start Rexster with the Cassandra as my backend source but it comes up with error while initializing. I have even trie