[ 
https://issues.apache.org/jira/browse/CASSANDRA-5816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13722904#comment-13722904
 ] 

Blair Zajac commented on CASSANDRA-5816:
----------------------------------------

The issue I have is that the cassandra package wants to uninstall chrony for 
ntp.  Here's a pristine Ubuntu 12.04.2 VM launched in OpenStack that adds 
DataStax's repo, installs chrony and then tries to install cassandra. 

{code}
root@server-2057c48c-24d1-40d1-b9b7-7b65890a5e56:~# curl 
http://debian.datastax.com/debian/repo_key | apt-key add -
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  2922  100  2922    0     0  18918      0 --:--:-- --:--:-- --:--:-- 36987
OK
root@server-2057c48c-24d1-40d1-b9b7-7b65890a5e56:/etc/apt/sources.list.d# echo 
deb http://debian.datastax.com/community stable main 
>/etc/apt/sources.list.d/datastax.list
root@server-2057c48c-24d1-40d1-b9b7-7b65890a5e56:/etc/apt/sources.list.d# 
apt-get update
Get:1 http://debian.datastax.com stable Release.gpg [287 B]
Get:2 http://debian.datastax.com stable Release [2,870 B]                      
Get:3 http://security.ubuntu.com precise-security Release.gpg [198 B]          
Get:4 http://debian.datastax.com stable/main amd64 Packages [8,844 B]          
Get:5 http://security.ubuntu.com precise-security Release [49.6 kB]            
Get:6 http://debian.datastax.com stable/main i386 Packages [8,835 B]           
Hit http://nova.clouds.archive.ubuntu.com precise Release.gpg                  
Ign http://debian.datastax.com stable/main TranslationIndex                    
Get:7 http://nova.clouds.archive.ubuntu.com precise-updates Release.gpg [198 B]
Get:8 http://security.ubuntu.com precise-security/main Sources [83.7 kB]
Hit http://nova.clouds.archive.ubuntu.com precise Release                     
Get:9 http://nova.clouds.archive.ubuntu.com precise-updates Release [49.6 kB]  
Get:10 http://security.ubuntu.com precise-security/universe Sources [27.6 kB] 
Get:11 http://security.ubuntu.com precise-security/main amd64 Packages [301 kB]
Ign http://debian.datastax.com stable/main Translation-en_US                   
Ign http://debian.datastax.com stable/main Translation-en                      
Get:12 http://nova.clouds.archive.ubuntu.com precise/main Sources [934 kB]     
Get:13 http://security.ubuntu.com precise-security/universe amd64 Packages 
[80.2 kB]
Get:14 http://security.ubuntu.com precise-security/main i386 Packages [316 kB] 
Get:15 http://security.ubuntu.com precise-security/universe i386 Packages [83.1 
kB]
Get:16 http://security.ubuntu.com precise-security/main TranslationIndex [74 B]
Get:17 http://security.ubuntu.com precise-security/universe TranslationIndex 
[73 B]
Get:18 http://security.ubuntu.com precise-security/main Translation-en [146 kB]
Get:19 http://security.ubuntu.com precise-security/universe Translation-en 
[51.1 kB]
Get:20 http://nova.clouds.archive.ubuntu.com precise/universe Sources [5,019 kB]
Hit http://nova.clouds.archive.ubuntu.com precise/main amd64 Packages
Hit http://nova.clouds.archive.ubuntu.com precise/universe amd64 Packages
Hit http://nova.clouds.archive.ubuntu.com precise/main i386 Packages
Hit http://nova.clouds.archive.ubuntu.com precise/universe i386 Packages
Hit http://nova.clouds.archive.ubuntu.com precise/main TranslationIndex
Hit http://nova.clouds.archive.ubuntu.com precise/universe TranslationIndex
Get:21 http://nova.clouds.archive.ubuntu.com precise-updates/main Sources [411 
kB]
Get:22 http://nova.clouds.archive.ubuntu.com precise-updates/universe Sources 
[93.4 kB]
Get:23 http://nova.clouds.archive.ubuntu.com precise-updates/main amd64 
Packages [668 kB]
Get:24 http://nova.clouds.archive.ubuntu.com precise-updates/universe amd64 
Packages [211 kB]
Get:25 http://nova.clouds.archive.ubuntu.com precise-updates/main i386 Packages 
[689 kB]
Get:26 http://nova.clouds.archive.ubuntu.com precise-updates/universe i386 
Packages [214 kB]
Get:27 http://nova.clouds.archive.ubuntu.com precise-updates/main 
TranslationIndex [3,564 B]
Get:28 http://nova.clouds.archive.ubuntu.com precise-updates/universe 
TranslationIndex [2,850 B]
Hit http://nova.clouds.archive.ubuntu.com precise/main Translation-en          
Hit http://nova.clouds.archive.ubuntu.com precise/universe Translation-en      
Get:29 http://nova.clouds.archive.ubuntu.com precise-updates/main 
Translation-en [303 kB]
Get:30 http://nova.clouds.archive.ubuntu.com precise-updates/universe 
Translation-en [124 kB]
Fetched 9,882 kB in 12s (794 kB/s)                                             
Reading package lists... Done
root@server-2057c48c-24d1-40d1-b9b7-7b65890a5e56:/etc/apt/sources.list.d# 
apt-get install chrony
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following extra packages will be installed:
  timelimit
The following NEW packages will be installed:
  chrony timelimit
0 upgraded, 2 newly installed, 0 to remove and 28 not upgraded.
Need to get 372 kB of archives.
After this operation, 870 kB of additional disk space will be used.
Do you want to continue [Y/n]? y
Get:1 http://nova.clouds.archive.ubuntu.com/ubuntu/ precise/universe timelimit 
amd64 1.8-1 [12.2 kB]
Get:2 http://nova.clouds.archive.ubuntu.com/ubuntu/ precise/universe chrony 
amd64 1.24-3.1ubuntu1 [359 kB]
Fetched 372 kB in 3s (107 kB/s)  
Selecting previously unselected package timelimit.
(Reading database ... 47446 files and directories currently installed.)
Unpacking timelimit (from .../timelimit_1.8-1_amd64.deb) ...
Selecting previously unselected package chrony.
Unpacking chrony (from .../chrony_1.24-3.1ubuntu1_amd64.deb) ...
Processing triggers for initramfs-tools ...
update-initramfs: Generating /boot/initrd.img-3.2.0-48-virtual
Processing triggers for man-db ...
Processing triggers for ureadahead ...
Processing triggers for install-info ...
Setting up timelimit (1.8-1) ...
Setting up chrony (1.24-3.1ubuntu1) ...

Creating config file /etc/chrony/chrony.conf with new version
Starting /usr/sbin/chronyd...
chronyd is running and online.
root@server-2057c48c-24d1-40d1-b9b7-7b65890a5e56:/etc/apt/sources.list.d# 
apt-get install cassandra
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following package was automatically installed and is no longer required:
  timelimit
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  ca-certificates-java icedtea-6-jre-cacao icedtea-6-jre-jamvm java-common
  jsvc libavahi-client3 libavahi-common-data libavahi-common3 libcap2
  libcommons-daemon-java libcups2 libjna-java libjpeg-turbo8 libjpeg8 libnspr4
  libnss3 libnss3-1d libopts25 ntp openjdk-6-jre-headless openjdk-6-jre-lib
  python-support tzdata-java
Suggested packages:
  default-jre equivs java-virtual-machine cups-common libjna-java-doc ntp-doc
  libnss-mdns sun-java6-fonts ttf-dejavu-extra fonts-ipafont-gothic
  fonts-ipafont-mincho ttf-wqy-microhei ttf-wqy-zenhei ttf-indic-fonts-core
  ttf-telugu-fonts ttf-oriya-fonts ttf-kannada-fonts ttf-bengali-fonts
Recommended packages:
  default-jre-headless java2-runtime-headless
The following packages will be REMOVED:
  chrony
The following NEW packages will be installed:
  ca-certificates-java cassandra icedtea-6-jre-cacao icedtea-6-jre-jamvm
  java-common jsvc libavahi-client3 libavahi-common-data libavahi-common3
  libcap2 libcommons-daemon-java libcups2 libjna-java libjpeg-turbo8 libjpeg8
  libnspr4 libnss3 libnss3-1d libopts25 ntp openjdk-6-jre-headless
  openjdk-6-jre-lib python-support tzdata-java
0 upgraded, 24 newly installed, 1 to remove and 28 not upgraded.
Need to get 49.6 MB of archives.
After this operation, 112 MB of additional disk space will be used.
Do you want to continue [Y/n]? 
{code}

Granted, using --no-install-recommends works (I tried it here), but again, not 
having to use --no-install-recommends it is a gain since people don't need to 
learn about it.

Thanks for suggesting and improving the original proposal using time-daemon, 
but again, I don't know why we're debating this when its a gain.
                
> [PATCH] Debian packaging: also recommend chrony and ptpd in addition to ntp
> ---------------------------------------------------------------------------
>
>                 Key: CASSANDRA-5816
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5816
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Packaging
>    Affects Versions: 1.2.7
>            Reporter: Blair Zajac
>            Assignee: Blair Zajac
>            Priority: Minor
>
> I'm switching my Ubuntu servers running Cassandra from ntp to chrony for the 
> reasons cited here when Fedora made the switch to have chrony be the default 
> NTP client:
> http://fedoraproject.org/wiki/Features/ChronyDefaultNTP
> Currently, the debian packaging recommends only ntp so if chrony is installed 
> it'll want to remove it and install ntp.  I also added ptpd, the Precision 
> Time Protocol daemon, which is another time syncing server for completeness.
> Please apply this to the 1.2 branch so the next 1.2.x release can deploy with 
> chrony.
> Below is the patch since it's a one-liner.
> Thanks,
> Blair
> --- a/debian/control
> +++ b/debian/control
> @@ -12,7 +12,7 @@ Standards-Version: 3.8.3
>  Package: cassandra
>  Architecture: all
>  Depends: openjdk-6-jre-headless (>= 6b11) | java6-runtime, jsvc (>= 1.0), 
> libcommons-daemon-java (>= 1.0), adduser, libjna-java, python (>= 2.5), 
> python-support (>= 0.90.0), ${misc:Depends}
> -Recommends: ntp
> +Recommends: chrony | ntp | ptpd
>  Conflicts: apache-cassandra1
>  Replaces: apache-cassandra1
>  Description: distributed storage system for structured data

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