Commit Graph

12 Commits

Author SHA1 Message Date
Nik Everett a04dcfb95b Introduce XContentParser#namedObject (#22003)
Introduces `XContentParser#namedObject which works a little like
`StreamInput#readNamedWriteable`: on startup components register
parsers under names and a superclass. At runtime we look up the
parser and call it to parse the object.

Right now the parsers take a context object they use to help with
the parsing but I hope to be able to eliminate the need for this
context as most what it is used for at this point is to move
around parser registries which should be replaced by this method
eventually. I make no effort to do so in this PR because it is
big enough already. This is meant to the a start down a road that
allows us to remove classes like `QueryParseContext`,
`AggregatorParsers`, `IndicesQueriesRegistry`, and
`ParseFieldRegistry`.

The goal here is to reduce the amount of plumbing required to
allow parsing pluggable things. With this you don't have to pass
registries all over the place. Instead you must pass a super
registry to fewer places and use it to wrap the reader. This is
the same tradeoff that we use for NamedWriteable and it allows
much, much simpler binary serialization. We think we want that
same thing for xcontent serialization.

The only parsing actually converted to this method is parsing
`ScoreFunctions` inside of `FunctionScoreQuery`. I chose this
because it is relatively self contained.
2016-12-20 11:05:24 -05:00
javanna 5dae10db11 [TEST] add warnings check to ESTestCase
We are currenlty checking that no deprecation warnings are emitted in our query tests. That can be moved to ESTestCase (disabled in ESIntegTestCase) as it allows us to easily catch where our tests use deprecated features and assert on the expected warnings.
2016-12-19 19:39:56 +01:00
Jason Tedor 9dc65037bc Lazy resolve unicast hosts
Today we eagerly resolve unicast hosts. This means that if DNS changes,
we will never find the host at the new address. Moreover, a single host
failng to resolve causes startup to abort. This commit introduces lazy
resolution of unicast hosts. If a DNS entry changes, there is an
opportunity for the host to be discovered. Note that under the Java
security manager, there is a default positive cache of infinity for
resolved hosts; this means that if a user does want to operate in an
environment where DNS can change, they must adjust
networkaddress.cache.ttl in their security policy. And if a host fails
to resolve, we warn log the hostname but continue pinging other
configured hosts.

When doing DNS resolutions for unicast hostnames, we wait until the DNS
lookups timeout. This appears to be forty-five seconds on modern JVMs,
and it is not configurable. If we do these serially, the cluster can be
blocked during ping for a lengthy period of time. This commit introduces
doing the DNS lookups in parallel, and adds a user-configurable timeout
for these lookups.

Relates #21630
2016-11-22 14:17:04 -05:00
Ryan Ernst 4f5a934d92 Plugins: Convert custom discovery to pull based plugin (#21398)
* Plugins: Convert custom discovery to pull based plugin

This change primarily moves registering custom Discovery implementations
to the pull based DiscoveryPlugin interface. It also keeps the cloud
based discovery plugins re-registering ZenDiscovery under their own name
in order to maintain backwards compatibility. However,
discovery.zen.hosts_provider is changed here to no longer fallback to
discovery.type. Instead, each plugin which previously relied on the
value of discovery.type now sets the hosts_provider to itself if
discovery.type is set to itself, along with a deprecation warning.
2016-11-08 12:52:10 -08:00
Ryan Ernst 7a2c984bcc Test: Remove multi process support from rest test runner (#21391)
At one point in the past when moving out the rest tests from core to
their own subproject, we had multiple test classes which evenly split up
the tests to run. However, we simplified this and went back to a single
test runner to have better reproduceability in tests. This change
removes the remnants of that multiplexing support.
2016-11-07 15:07:34 -08:00
Ryan Ernst 60353a245a Plugins: Make UnicastHostsProvider extension pull based (#21036)
This change moves providing UnicastHostsProvider for zen discovery to be
pull based, adding a getter in DiscoveryPlugin. A new setting is added,
discovery.zen.hosts_provider, to separate the discovery type from the
hosts provider for zen when it is selected. Unfortunately existing
plugins added ZenDiscovery with their own name in order to just provide
a hosts provider, so there are already many users setting the hosts
provider through discovery.type. This change also includes backcompat,
falling back to discovery.type when discovery.zen.hosts_provider is not
set.
2016-10-20 09:13:59 -07:00
Ryan Ernst 53cff0f00f Move all zen discovery classes into o.e.discovery.zen (#21032)
* Move all zen discovery classes into o.e.discovery.zen

This collapses sub packages of zen into zen. These all had just a couple
classes each, and there is really no reason to have the subpackages.

* fix checkstyle
2016-10-20 00:44:48 -07:00
Nik Everett cf4038b668 DeGuice some of IndicesModule
UpdateHelper, MetaDataIndexUpgradeService, and some recovery
stuff.

Move ClusterSettings to nullable ctor parameter of TransportService
so it isn't forgotten.
2016-10-07 11:14:38 -04:00
Simon Willnauer 7452028e50 Simplify TransportAddress (#20798)
since TransportAddress is now final we can simplify it's interface a bit
and remove methods that are only used in tests or are plain delegates.
2016-10-07 15:56:54 +02:00
Ali Beyad 5031824291 File-based discovery plugin integration tests (#20492)
Adds an integration test for the file-based discovery plugin
to test the plugin operates correctly and uses the hosts
configured in `unicast_hosts.txt` with a real cluster

Closes #20459
2016-09-21 15:48:18 -04:00
Simon Willnauer f5daa165f1 Remove ability to plug-in TransportService (#20505)
TransportService is such a central part of the core server, replacing
it's implementation is risky and can cause serious issues. This change removes the ability to
plug in TransportService but allows registering a TransportInterceptor that enables
plugins to intercept requests on both the sender and the receiver ends. This is a commonly used
and overwritten functionality but encapsulates the custom code in a contained manner.
2016-09-16 09:47:53 +02:00
Ali Beyad 4431720c3d File-based discovery plugin (#20394)
This commit introduces a new plugin for file-based unicast hosts
discovery. This allows specifying the unicast hosts participating
in discovery through a `unicast_hosts.txt` file located in the
`config/discovery-file` directory. The plugin will use the hosts 
specified in this file as the set of hosts to ping during discovery.

The format of the `unicast_hosts.txt` file is to have one host/port
entry per line. The hosts file is read and parsed every time
discovery makes ping requests, thus a new version of the file that
is published to the config directory will automatically be picked
up.

Closes #20323
2016-09-13 20:52:39 -04:00