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vespa-engine/hakonhall/support-monitoring-health-of-tenant-hosts
Support monitoring health of tenant hosts
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Reset container CPU cap fixes
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Introduce feature flags for the "tls-insecure" configuration
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dupermodel-use-configserverconfig, proxyhost-uses-real-orchestrator, and confighost-uses-real-orchestrator flags
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flip the right flag
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This reverts commit 7a8c964cbc167b617a6c5feb8c62b7585d7e542a.
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vespa-engine/hakonhall/dupermodel-config-server-app-from-infrastructureprovisioner-not-configserverconfig
DuperModel config server app from InfrastructureProvisioner not ConfigserverConfig
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ConfigserverConfig
The new value "false" has already rolled out via file flags to controllers,
which had to be done intra-rollout since the name changed.
The config server rollout should be seemless as the name and set of config
servers are identical (post BM -> DH cfg migration).
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* Added logserver feature flag
* Let FlagSource be non-optional
* Get flag value for application
* Set default flagSource value where not injected
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vespa-engine/hakonhall/flag-repository-cfg-client-and-flag-directory
Flag repository cfg client and flag directory
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- Makes new FlagRepository config server client to retrieve all flag data.
- Makes WireFlagDataList to be used for creating the HTTP response in the
config server, and parse the HTTP response in host admin.
- Fixes problem with URL generation for controller: when port is not present
in the request, remove ":-1" port specification in the url.
- Makes a new FlagDirectory class, responsible for reading flags from
/opt/vespa/var/vespa/flags (in FlagData JSON format), and reversely,
sync that directory to exactly match a set of FlagData.
- No longer have 'State state()' as a default method in interface.
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Export FlagData wire format
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The FlagData wire format (WireFlagData and friends) is useful with e.g. Jersey
JAX-RS client when Jackson is used as a serializer. Therefore, export it.
Also, add a bit more sanity-checking on using Flags.Replacer during tests.
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This reintroduces the non-generic flag classes:
- a value() returns the primitive type for flags wrapping a primitive type
- easier to use in testing
- Serializer is moved to internals of typed class
Defines the flag backed by boolean BooleanFlag instead of FeatureFlag since not
all boolean flags are necessarily guarding a feature.
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- Exposes all defined flags at /flags/v1/defined.
- Defines all hosted flags in Flags. Perhaps later we can support hiding
hosted flags (aka support different set of flags for different teams).
- Categorizes /flags/v1 as a hosted vespa operation for /zone/v2.
Also fixes component definitions in services.xml. The affected bundles have
been verified at an example config server.
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Adds a new ZooKeeper backed flag source. It is defined in a new module
configserver-flags to allow as many as possible config server modules to depend
on it by minimizing dependencies.
The content of the ZK backed flag source can be viewed and modified through
REST API on the config server/controller. The data stored per flag looks like
{
"rules": [
{
"conditions": [
{ "type": "whitelist", "dimension": "hostname", "values": ["host1"] }
],
"value": true
}
]
}
typical for enabling a feature flag on host1.
2 types of conditions are so far supported: whitelist and blacklist. All the
conditions must match in order for the value to apply. If the value is null (or
absent), the default value will be used. At the time the flag's value is
retrieved, it is resolved against the conditions with the current zone,
hostname, and/or application.
The same data structure is used for FileFlagSource for files in
/etc/vespa/flags with the ".2" extension.
The FlagSource component injected in the config server is changed to:
1. Return the flag value if specified in /etc/vespa/flags, or otherwise
2. return flag value from ZooKeeper (same as REST API)
The current flags (module) is also changed:
- All flags must be defined in com.yahoo.vespa.flags.Flags. This allows the ZK
backed flag source additional sanity checking when modifying flags.
- If it makes sense to have different flag value depending on e.g. the
application, then at some point before the value is retrieved, one has to
bind the flag to that application (using with() to set up the fetch vector).
Future changes would be to 0. make a merged FlagSource in host admin, 1. add
support for viewing and modifying feature flags in dashboard, 2. in hv tool.
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After review & new ideas:
- All Optional classes have been removed: They must take a default argument
to avoid having clients test whether the flag has been set or not, in order
to allow local file flag source to undo a file flag setting from config
server.
- FeatureFlag is now backed by FlagSource::getString, and
FlagSource::hasFeature has been removed.
- FeatureFlag now allows default-true to facilitate default-enabled features
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FileFlagSource reads flags from files in /etc/vespa/flags and is a component
that can be injected in host admin, config server, etc. A flag named foo
corresponds to filename foo.
In general a FlagSource manages:
- Feature flags: A feature is either set (true/enabled) or otherwise false.
Touching a file foo means the feature flag foo is set (true).
- Value flags: Either a String or empty if not set. The String corresponds to
the file content.
The plan is to make the config server another source of flags. A unified
FlagSource can merge the two sources with some priority and used in e.g. parts
of node-admin. In other parts one would only have access to the file source.
Defines various flag facades:
- FeatureFlag: Used to test whether a feature has been enabled or not.
- IntFlag
- JacksonFlag: Deserializes JSON to Jackson class, or return default if unset.
- LongFlag
- OptionalJacksonFlag: Deserializes JSON to Jackson class, or empty if unset.
- OptionalStringFlag
- StringFlag
This is part of removing some of the last Chef recipes. Some minor tweaks have
been necessary as part of this and are included in this PR (test whether a
systemd service exists, task-friendly file deletion, allow capitalized letters
in YUM package name).
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