While installing Riak 1.4 I encountered some issues and thought writing down the answers might help someone else.
Following the instructions for Installing From Apt-Get, when I reached:
sudo apt-get install riak
I got this message:
Failed to fetch
http://apt.basho.com/pool/precise/main/riak_1.4.0-1_amd64.deb Size mismatch
E: Unable to fetch some archives, maybe run apt-get update or try with
–fix-missing?
Not a problem with the Riak 1.4 distribution but an error with Ubuntu.
Correct as follows:
sudo aptitude clean
(rtn)
Then;
sudo aptitude update
(rtn)
close, restart Linux
Cleans the apt cache and then the install was successful.
Basho suggests to start Riak with:
riak start
My results:
Unable to access /var/run/riak, permission denied, run script as root
Use:
sudo riak start
I then read:
sudo riak start
!!!!
!!!! WARNING: ulimit -n is 1024; 4096 is the recommended minimum.
!!!!
The ulimit warning is not unexpected and solutions are documented at: Open Files Limit.
As soon as I finish this session, I am going to create the file /etc/default/riak and its contents will be:
ulimit -n 65536
The file needs to be created as root.
May as well follow the instructions for “Enable PAM Based Limits for Debian & Ubuntu” in the Open Files document as well. Requires a reboot.
The rest of the tests of the node went well until I got to:
riak-admin diag
The documentation notes:
Make the recommended changes from the command output to ensure optimal node operation.
I was running in an Emacs shell so capturing the output was easy:
riak-admin diag
[critical] vm.swappiness is 60, should be no more than 0
[critical] net.core.wmem_default is 229376, should be at least 8388608
[critical] net.core.rmem_default is 229376, should be at least 8388608
[critical] net.core.wmem_max is 131071, should be at least 8388608
[critical] net.core.rmem_max is 131071, should be at least 8388608
[critical] net.core.netdev_max_backlog is 1000, should be at least 10000
[critical] net.core.somaxconn is 128, should be at least 4000
[critical] net.ipv4.tcp_max_syn_backlog is 2048, should be at least 40000
[critical] net.ipv4.tcp_fin_timeout is 60, should be no more than 15
[critical] net.ipv4.tcp_tw_reuse is 0, should be 1
[warning] The following preflists do not satisfy the n_val:
[[{0,
‘riak@127.0.0.1’},
{22835963083295358096932575511191922182123945984,
‘riak@127.0.0.1’},
{45671926166590716193865151022383844364247891968,
‘riak@127.0.0.1’}],
[approx. 376 lines omitted]
[{1438665674247607560106752257205091097473808596992,
‘riak@127.0.0.1’},
{0,
‘riak@127.0.0.1’},
{22835963083295358096932575511191922182123945984,
‘riak@127.0.0.1’}]]
[notice] Data directory /var/lib/riak/bitcask is not mounted with ‘noatime’. Please remount its disk with the ‘noatime’ flag to improve performance.
The first block of messages:
[critical] vm.swappiness is 60, should be no more than 0
[critical] net.core.wmem_default is 229376, should be at least 8388608
[critical] net.core.rmem_default is 229376, should be at least 8388608
[critical] net.core.wmem_max is 131071, should be at least 8388608
[critical] net.core.rmem_max is 131071, should be at least 8388608
[critical] net.core.netdev_max_backlog is 1000, should be at least 10000
[critical] net.core.somaxconn is 128, should be at least 4000
[critical] net.ipv4.tcp_max_syn_backlog is 2048, should be at least 40000
[critical] net.ipv4.tcp_fin_timeout is 60, should be no more than 15
[critical] net.ipv4.tcp_tw_reuse is 0, should be 1
are network tuning issues.
Basho answers the “how to correct?” question at Linux Performance Tuning but there is no link from the Post Installation Notes.
The next block of messages:
[warning] The following preflists do not satisfy the n_val:
[[{0,
‘riak@127.0.0.1’},
{22835963083295358096932575511191922182123945984,
‘riak@127.0.0.1’},
{45671926166590716193865151022383844364247891968,
‘riak@127.0.0.1’}],
[approx. 376 lines omitted]
[{1438665674247607560106752257205091097473808596992,
‘riak@127.0.0.1’},
{0,
‘riak@127.0.0.1’},
{22835963083295358096932575511191922182123945984,
‘riak@127.0.0.1’}]]
is a known issue: N Value – Preflist Message is Vague.
From the issue, the message means: “these preflists have more than one replica on the same node.”
Not surprising since I am running on one physical node and not in production.
The Riak Fast Track has you create four nodes on one physical node as a development environment. So I’m going to ignore the “prelists” warning in this context.
The last message:
[notice] Data directory /var/lib/riak/bitcask is not mounted with ‘noatime’. Please remount its disk with the ‘noatime’ flag to improve performance.
is resolved under “Mounts and Scheduler” in the Linux Performance Tuning document.
I am going to make all the system changes, reboot and start on the The Riak Fast Track tomorrow.
PS: In case you are wondering what this has to do with topic maps, ask yourself what characteristics you would want in a distributed topic map system?
[…] up on yesterday’s post on installing Riak 1.4 with some minor […]
Pingback by Riak 1.4 – More Install Notes on Ubuntu 12.04 (precise) « Another Word For It — July 12, 2013 @ 1:37 pm