Linux Control Groups (cgroups)
Minimum Required Role: Full Administrator. This feature is not available when using Cloudera Manager to manage Data Hub clusters.
Cloudera Manager supports the Linux control groups (cgroups) kernel feature. With cgroups, administrators can impose per-resource restrictions and limits on services and roles. This provides the ability to allocate resources using cgroups to enable isolation of compute frameworks from one another. Resource allocation is implemented by setting properties for the services and roles.
Linux Distribution Support
Cgroups are a feature of the Linux kernel, and as such, support depends on the host's Linux distribution and version as shown in the following tables. If a distribution lacks support for a given parameter, changes to the parameter have no effect.
| Distribution | CPU Shares | I/O Weight | Memory Soft Limit | Memory Hard Limit |
|---|---|---|---|---|
| Red Hat Enterprise Linux, CentOS, and Oracle Enterprise Linux 7 |  |
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| Red Hat Enterprise Linux, CentOS, and Oracle Enterprise Linux 6 | |
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| Distribution | CPU Shares | I/O Weight | Memory Soft Limit | Memory Hard Limit |
|---|---|---|---|---|
| SUSE Linux Enterprise Server 12 | |
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| SUSE Linux Enterprise Server 11 | |
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| Distribution | CPU Shares | I/O Weight | Memory Soft Limit | Memory Hard Limit |
|---|---|---|---|---|
| Ubuntu 16.04 LTS | |
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| Ubuntu 16.04 LTS | |
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| Ubuntu 14.04 LTS | |
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| Ubuntu 12.04 LTS | |
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| Distribution | CPU Shares | I/O Weight | Memory Soft Limit | Memory Hard Limit |
|---|---|---|---|---|
| Debian 7.1 | |
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| Debian 7.0 | |
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| Debian 6.0 | |
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| Distribution | CPU Shares | I/O Weight | Memory Soft Limit | Memory Hard Limit |
|---|---|---|---|---|
| Oracle linux 7 | |
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| Oracle linux 6 | |
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The exact level of support can be found in the Cloudera Manager Agent log file, shortly after the Agent has started. In the log file, look for an entry like this:
Found cgroups capabilities: {
'has_memory': True,
'default_memory_limit_in_bytes': 9223372036854775807,
'writable_cgroup_dot_procs': True,
'has_cpu': True,
'default_blkio_weight': 1000,
'default_cpu_shares': 1024,
'has_blkio': True}The has_cpu and similar entries correspond directly to
support for the CPU, I/O, and memory parameters.
