Commit Graph

1573 Commits

Author SHA1 Message Date
Tim Brooks 88c178dca6
Add sni name to SSLEngine in netty transport (#33144)
This commit is related to #32517. It allows an "server_name"
attribute on a DiscoveryNode to be propagated to the server using
the TLS SNI extentsion. This functionality is only implemented for
the netty security transport.
2018-09-05 16:12:10 -06:00
Armin Braun 46774098d9
INGEST: Implement Drop Processor (#32278)
* INGEST: Implement Drop Processor
* Adjust Processor API
* Implement Drop Processor
* Closes #23726
2018-09-05 14:25:29 +02:00
Jim Ferenczi dbc7102c86
Fix inner hits retrieval when stored fields are disabled (_none_) (#33018)
Now that types are unique per mapping we can retrieve the document mapper
without referencing the type. This fixes an NPE when stored fields are disabled.
For 6x we'll need a different fix since mappings can still have multiple types.

Relates #32941
2018-09-04 16:25:52 +02:00
Jason Tedor 09bf4e5f00
Introduce private settings (#33327)
This commit introduces the formal notion of a private setting. This
enables us to register some settings that we had previously not
registered as fully-fledged settings to avoid them being exposed via
APIs such as the create index API. For example, we had hacks in the
codebase to allow index.version.created to be passed around inside of
settings objects, but was not registered as a setting so that if a user
tried to use the setting on any API then they would get an
exception. This prevented users from setting index.version.created on
index creation, or updating it via the index settings API. By
introducing private settings, we can continue to reject these attempts,
yet now we can represent these settings as actual settings. In this
change, we register index.version.created as an actual setting. We do
not cutover all settings that we had been treating as private in this
pull request, it is already quite large due to moving some tests around
to account for the fact that some tests need to be able to set the
index.version.created. This can be done in a follow-up change.
2018-09-03 19:17:57 -04:00
Nik Everett f8b7a4dbc8
Logging: Drop Settings from some logging ctors (#33332)
Drops `Settings` from some logging ctors now that they are no longer
needed. This should allow us to stop passing `Settings` around to quite
as many places.
2018-09-02 16:51:26 -04:00
Vladimir Dolzhenko 3d82a30fad
drop `index.shard.check_on_startup: fix` (#32279)
drop `index.shard.check_on_startup: fix`

Relates #31389
2018-08-31 21:29:06 +02:00
Nhat Nguyen ad4dd086d2 Integrates soft-deletes into Elasticsearch (#33222)
This PR integrates Lucene soft-deletes(LUCENE-8200) into Elasticsearch.
Highlight works in this PR include:

- Replace hard-deletes by soft-deletes in InternalEngine
- Use _recovery_source if _source is disabled or modified (#31106)
- Soft-deletes retention policy based on the global checkpoint (#30335)
- Read operation history from Lucene instead of translog (#30120)
- Use Lucene history in peer-recovery (#30522)

Relates #30086
Closes #29530

---
These works have been done by the whole team; however, these individuals
(lexical order) have significant contribution in coding and reviewing:

Co-authored-by: Adrien Grand <jpountz@gmail.com>
Co-authored-by: Boaz Leskes <b.leskes@gmail.com>
Co-authored-by: Jason Tedor <jason@tedor.me>
Co-authored-by: Martijn van Groningen <martijn.v.groningen@gmail.com>
Co-authored-by: Nhat Nguyen <nhat.nguyen@elastic.co>
Co-authored-by: Simon Willnauer <simonw@apache.org>
2018-08-30 23:46:07 -04:00
Nhat Nguyen 547de71d59 Revert "Integrates soft-deletes into Elasticsearch (#33222)"
Revert to correct co-author tags.
This reverts commit 6dd0aa54f6.
2018-08-30 23:44:57 -04:00
Nhat Nguyen 6dd0aa54f6
Integrates soft-deletes into Elasticsearch (#33222)
This PR integrates Lucene soft-deletes(LUCENE-8200) into Elasticsearch.
Highlight works in this PR include:

- Replace hard-deletes by soft-deletes in InternalEngine
- Use _recovery_source if _source is disabled or modified (#31106)
- Soft-deletes retention policy based on the global checkpoint (#30335)
- Read operation history from Lucene instead of translog (#30120)
- Use Lucene history in peer-recovery (#30522)

Relates #30086
Closes #29530

---
These works have been done by the whole team; however, these individuals
(lexical order) have significant contribution in coding and reviewing:

Co-authored-by: Adrien Grand jpountz@gmail.com
Co-authored-by: Boaz Leskes b.leskes@gmail.com
Co-authored-by: Jason Tedor jason@tedor.me
Co-authored-by: Martijn van Groningen martijn.v.groningen@gmail.com
Co-authored-by: Nhat Nguyen nhat.nguyen@elastic.co
Co-authored-by: Simon Willnauer simonw@apache.org
2018-08-30 22:11:23 -04:00
Nhat Nguyen 39839f97ef
TEST: Access cluster state directly in assertSeqNos (#33277)
Some AbstractDisruptionTestCase tests start failing since we enabled
assertSeqNos (in #33130). They fail because the assertSeqNos assertion
queries cluster stats while the cluster is disrupted or not formed yet.

This commit switches to use the cluster state and shard stats directly
from the test cluster.

Closes #33251
2018-08-30 19:37:20 -04:00
Armin Braun cc4d7059bf
Ingest: Add conditional per processor (#32398)
* Ingest: Add conditional per processor
* closes #21248
2018-08-30 03:46:39 +02:00
Matt Weber 92bd7242a3 Fix classpath security checks for external tests. (#33066)
This commit checks that when we manually add a class to
the codebase map, that it does in-fact not exist on the classpath
in a jar.  This will only be true if we are using the test framework
externally such as when a user develops a plugin.
2018-08-29 12:19:58 -07:00
Alpar Torok f29f0af7bc
Consider multi release jars when running third party audit (#33206)
Exclude classes meant for newer versions than what we are auditing against, those classes won't be found. There's no reason to exclude JDK classes from newer versions, with this PR, we will not extract them in the first place.
2018-08-29 09:53:04 +03:00
Jonathan Little 9d92a87ae6 Remove support for deprecated params._agg/_aggs for scripted metric aggregations (#32979) 2018-08-28 09:27:43 +01:00
Alpar Torok 2cc611604f
Run Third party audit with forbidden APIs CLI (part3/3) (#33052)
The new implementation is functional equivalent with the old, ant based one.
It parses task standard error to get the missing classes and violations in the same way.
I considered re-using ForbiddenApisCliTask but Gradle makes it hard to build inheritance with tasks that have task actions , since the order of the task actions can't be controlled.
This inheritance isn't dully desired either as the third party audit task is much more opinionated and we don't want to expose some of the configuration.
We could probably extract a common base class without any task actions, but probably more trouble than it's worth.

Closes #31715
2018-08-28 10:03:30 +03:00
Nhat Nguyen 014b3236dc
Ensure to generate identical NoOp for the same failure (#33141)
We generate slightly different NoOps in InternalEngine and
TransportShardBulkAction for the same failure.

1. InternalEngine uses Exception#getFailure to generate a message
without the class name: newOp [NoOp{seqNo=1, primaryTerm=1,
reason='Contexts are mandatory in context enabled completion field
[suggest_context]'}].

2. TransportShardBulkAction uses Exception#toString to generate a
message with the class name: NoOp{seqNo=1, primaryTerm=1,
reason='java.lang.IllegalArgumentException: Contexts are mandatory in
context enabled completion field [suggest_context]'}.

If a write operation fails while a replica is recovering, that replica
will possibly receive two different NoOps: one from recovery and one
from replication. These two different NoOps will trip
TranslogWriter#assertNoSeqNumberConflict assertion.

This commit ensures that we generate the same Noop for the same failure.

Closes #32986
2018-08-27 15:59:42 -04:00
Simon Willnauer 3376922e8b
Add proxy support to RemoteClusterConnection (#33062)
This adds support for connecting to a remote cluster through
a tcp proxy. A remote cluster can configured with an additional
`search.remote.$clustername.proxy` setting. This proxy will be used
to connect to remote nodes for every node connection established.
We still try to sniff the remote clsuter and connect to nodes directly
through the proxy which has to support some kind of routing to these nodes.
Yet, this routing mechanism requires the handshake request to include some
kind of information where to route to which is not yet implemented. The effort
to use the hostname and an optional node attribute for routing is tracked
in #32517

Closes #31840
2018-08-25 20:41:32 +02:00
Nhat Nguyen 9dad82ece8
TEST: Skip assertSeqNos for closed shards (#33130)
If a shard was closed, we return null for SeqNoStats. Therefore the
assertion assertSeqNos will hit NPE when it verifies a closed shard.

This commit skips closed shards in assertSeqNos and enables this
assertion in AbstractDisruptionTestCase.
2018-08-24 21:02:13 -04:00
Nhat Nguyen 739a8d3d44
TEST: resync operation on replica should acquire shard permit (#33103)
This change makes sure that resync operations on replicas in the test
framework are executed under shard permits as the production code.
2018-08-24 20:25:13 -04:00
Jason Tedor 619e0b28b9
Add hook to skip asserting x-content equivalence (#33114)
This commit adds a hook to AbstractSerializingTestCase to enable
skipping asserting that the x-content of the test instance and an
instance parsed from the x-content of the test instance are the
same. While we usually expect these to be the same, they will not be the
same when exceptions are involved because the x-content there is lossy.
2018-08-24 06:53:44 -04:00
Jim Ferenczi f4e9729d64
Remove unsupported Version.V_5_* (#32937)
This change removes the es 5x version constants and their usages.
2018-08-24 09:51:21 +02:00
Armin Braun 917e5a8c94
TESTS: Fix Random Fail in MockTcpTransportTests (#33061)
* `foobar.txGet()` appears to return before `serviceB.stop()` returns, causing `ServiceB.close()` to run concurrently with the `stop` call and running into a race codition
* Closes #32863
2018-08-23 13:19:21 +02:00
Luca Cavanna 393eec1482
Set maxScore for empty TopDocs to Nan rather than 0 (#32938)
We used to set `maxScore` to `0` within `TopDocs` in situations where there is really no score as the size was set to `0` and scores were not even tracked. In such scenarios, `Float.Nan` is more appropriate, which gets converted to `max_score: null` on the REST layer. That's also more consistent with lucene which set `maxScore` to `Float.Nan` when merging empty `TopDocs` (see `TopDocs#merge`).
2018-08-22 17:23:54 +02:00
Nhat Nguyen 262d3c0783
Allow engine to recover from translog upto a seqno (#33032)
This change allows an engine to recover from its local translog up to
the given seqno. The extended API can be used in these use cases:

When a replica starts following a new primary, it resets its index to
the safe commit, then replays its local translog up to the current
global checkpoint (see #32867).

When a replica starts a peer-recovery, it can initialize the
start_sequence_number to the persisted global checkpoint instead of the
local checkpoint of the safe commit. A replica will then replay its
local translog up to that global checkpoint before accepting remote
translog from the primary. This change will increase the chance of
operation-based recovery. I will make this in a follow-up.

Relates #32867
2018-08-22 07:57:44 -04:00
David Turner ab000323fa
Allow extension of CapturingTransport by subclasses (#33012)
Today, CapturingTransport#createCapturingTransportService creates a transport
service with a connection manager with reasonable default behaviours, but
overriding this behaviour in a consumer is a litle tricky. Additionally, the
default behaviour for opening a connection duplicates the content of the
CapturingTransport#openConnection() method.

This change removes this duplication by delegating to openConnection() and
introduces overridable nodeConnected() and onSendRequest() methods so that
consumers can alter this behaviour more easily.

Relates #32246 in which we test the mechanisms for opening connections to
unknown (and possibly unreachable) nodes.
2018-08-22 09:09:08 +01:00
Alpar Torok 82d10b484a
Run forbidden api checks with runtimeJavaVersion (#32947)
Run forbidden APIs checks with runtime hava version
2018-08-22 09:05:22 +03:00
Simon Willnauer 92076497e5
Use a dedicated ConnectionManger for RemoteClusterConnection (#32988)
This change introduces a dedicated ConnectionManager for every RemoteClusterConnection
such that there is not state shared with the TransportService internal ConnectionManager.
All connections to a remote cluster are isolated from the TransportService but still uses
the TransportService and it's internal properties like the Transport, tracing and internal
listener actions on disconnects etc.
This allows a remote cluster connection to have a different lifecycle than a local cluster connection,
also local discovery code doesn't get notified if there is a disconnect on from a remote cluster and
each connection can use it's own dedicated connection profile which allows to have a reduced set of
connections per cluster without conflicting with the local cluster.

Closes #31835
2018-08-21 12:43:25 +02:00
Tim Brooks cd83ddcecc
Fix assertion in AbstractSimpleTransportTestCase (#32991)
This is a follow-up to #32956. That commit incorrectly used assertBusy
which led to a possible race in the test. This commit fixes it.
2018-08-20 16:09:22 -06:00
Tim Brooks faa42de66d
Pass DiscoveryNode to initiateChannel (#32958)
This is related to #32517. This commit passes the DiscoveryNode to the
initiateChannel method for different Transport implementation. This
will allow additional attributes (besides just the socket address) to be
used when opening channels.
2018-08-20 08:54:55 -06:00
Alpar Torok 4b34b3f4aa
Set forbidden APIs target compatibility to compiler java version (#32935)
Set forbidden apis target compatibility to compiler version

Fix outstanding deprecation
2018-08-20 09:27:02 +03:00
Tim Brooks de92d2ef1f
Move connection listener to ConnectionManager (#32956)
This is a followup to #31886. After that commit the
TransportConnectionListener had to be propogated to both the
Transport and the ConnectionManager. This commit moves that listener
to completely live in the ConnectionManager. The request and response
related methods are moved to a TransportMessageListener. That listener
continues to live in the Transport class.
2018-08-18 10:09:24 -06:00
Tim Brooks 2464b68613
Move connection profile into connection manager (#32858)
This is related to #31835. It moves the default connection profile into
the ConnectionManager class. The will allow us to have different
connection managers with different profiles.
2018-08-15 09:08:33 -06:00
Lee Hinman 48281ac5bc
Use generic AcknowledgedResponse instead of extended classes (#32859)
This removes custom Response classes that extend `AcknowledgedResponse` and do nothing, these classes are not needed and we can directly use the non-abstract super-class instead.

While this appears to be a large PR, no code has actually changed, only class names have been changed and entire classes removed.
2018-08-15 08:06:14 -06:00
Ryan Ernst 0158b59a5a
Test: Fix forbidden uses in test framework (#32824)
This commit fixes existing uses of forbidden apis in the test framework
and re-enables the forbidden apis check. It was previously completely
disabled and had missed a rename of the forbidden apis signatures files.

closes #32772
2018-08-14 11:35:09 -07:00
Tim Brooks 10fddb62ee
Remove client connections from TcpTransport (#31886)
This is related to #31835. This commit adds a connection manager that
manages client connections to other nodes. This means that the
TcpTransport no longer maintains a map of nodes that it is connected
to.
2018-08-13 16:44:09 -06:00
Armin Braun d412230cda
SCRIPTING: Support BucketAggScript return null (#32811)
* As explained in #32790, `BucketAggregationScript` must support `null` as a return value
* Closes #32790
2018-08-13 20:08:26 +02:00
Nik Everett f5ba801c6b Test: Only sniff host metadata for node_selectors (#32750)
Our rest testing framework has support for sniffing the host metadata on
startup and, before this change, it'd sniff that metadata before running
the first test. This prevents running these tests against
elasticsearch installations that won't support sniffing like Elastic
Cloud. This change allows tests to only sniff for metadata when they
encounter a test with a `node_selector`. These selectors are the things
that need the metadata anyway and they are super rare. Tests that use
these won't be able to run against installations that don't support
sniffing but we can just skip them. In the case of Elastic Cloud, these
tests were never going to work against Elastic Cloud anyway.
2018-08-10 13:35:47 -04:00
Christoph Büscher 22f7b03430
Fix test reproducability in AbstractBuilderTestCase setup (#32403)
Currently AbstractBuilderTestCase generates certain random values in its
`beforeTest()` method annotated with @Before only the first time that a test
method in the suite is run while initializing the serviceHolder that we use for
the rest of the test. This changes the values of subsequent random values
and has the effect that when running single methods from a test suite with
"-Dtests.method=*", the random values it sees are different from when the same
test method is run as part of the whole test suite. This makes it hard to use
the reproduction lines logged on failure.

This change runs the inialization of the serviceHolder and the randomization 
connected to it using the test runners master seed, so reproduction by running
just one method is possible again.


Closes #32400
2018-08-10 15:13:44 +02:00
Boaz Leskes f58ed21720
Refactor TransportShardBulkAction to better support retries (#31821)
Processing bulk request goes item by item. Sometimes during processing, we need to stop execution and wait for a new mapping update to be processed by the node. This is currently achieved by throwing a `RetryOnPrimaryException`, which is caught higher up. When the exception is caught, we wait for the next cluster state to arrive and process the request again. Sadly this is a problem because all operations that were already done until the mapping change was required are applied again and get new sequence numbers. This in turn means that the previously issued sequence numbers are never replicated to the replicas. That causes the local checkpoint of those shards to be stuck and with it all the seq# based infrastructure.

This commit refactors how we deal with retries with the goal of removing  `RetryOnPrimaryException` and `RetryOnReplicaException` (not done yet). It achieves so by introducing a class `BulkPrimaryExecutionContext` that is used the capture the execution state and allows continuing from where the execution stopped. The class also formalizes the steps each item has to go through:
1) A translation phase for updates
2) Execution phase (always index/delete)
3) Waiting for a mapping update to come in, if needed
4) Requires a retry (for updates and cases where the mapping are still not available after the put mapping call returns)
5) A finalization phase which allows updates to the index/delete result to an update result.
2018-08-10 10:15:01 +02:00
Alpar Torok af8c23eb40
Java version reproduction (#32715)
Enhance reproduction line with info about jdks

Provide the ability to control compiler and hava versions just by
passing a property. The actual java home comes from the
`JAVA<major>_HOME` env vars that we allready require.
This works better with the Gradle daemon as well.

Output is also changed a bit.

for `-Druntime.java=8 -Dcompiler.java=9`:
```
=======================================
Elasticsearch Build Hamster says Hello!
  Gradle Version        : 4.9
  OS Info               : Linux 4.17.8-1-ARCH (amd64)
  Compiler JDK Version  : 11 (Oracle Corporation 11-ea [OpenJDK 64-Bit Server VM 11-ea+22])
  Runtime JDK Version   : 11 (Oracle Corporation 11-ea [OpenJDK 64-Bit Server VM 11-ea+22])
  Gradle JDK Version    : 10 (Oracle Corporation 10.0.1 [OpenJDK 64-Bit Server VM 10.0.1+10])
  Compiler java.home    : /home/alpar/opt/jdk-11-ea22/
  Runtime java.home     : /home/alpar/opt/jdk-11-ea22/
  Gradle java.home      : /usr/lib/jvm/java-10-openjdk
  Random Testing Seed   : EA858533191E8DFB
=======================================
```

Without configuration:
```
=======================================
Elasticsearch Build Hamster says Hello!
=======================================
  Gradle Version        : 4.9
  OS Info               : Linux 4.17.8-1-ARCH (amd64)
  JDK Version           : 10 (Oracle Corporation 10.0.1 [OpenJDK 64-Bit Server VM 10.0.1+10])
  JAVA_HOME             : /usr/lib/jvm/java-10-openjdk
  Random Testing Seed   : 4BD5B2A839C8FCA1
=======================================
```

Here's how a reproduction line will look like (test made to fail):
```
./gradlew :modules:lang-painless:test -Dtests.seed=2DA2379065A4EEAB -Dtests.class=org.elasticsearch.painless.AdditionTests -Dtests.method="testInt" -Dtests.security.manager=true -Dtests.locale=es-PE -Dtests.timezone=WET -Dcompiler.java=10 -Druntime.java=10
```
2018-08-10 08:07:43 +00:00
Armin Braun 79375d35bb
Scripting: Replace Update Context (#32096)
* SCRIPTING: Move Update Scripts to their own context
* Added system property for backwards compatibility of change to `ctx.params`
2018-08-09 14:32:36 +02:00
Jason Tedor dcc816427e
Expose whether or not the global checkpoint updated (#32659)
It will be useful for future efforts to know if the global checkpoint
was updated. To this end, we need to expose whether or not the global
checkpoint was updated when the state of the replication tracker
updates. For this, we add to the tracker a callback that is invoked
whenever the global checkpoint is updated. For primaries this will be
invoked when the computed global checkpoint is updated based on state
changes to the tracker. For replicas this will be invoked when the local
knowledge of the global checkpoint is advanced from the primary.
2018-08-07 15:10:09 -04:00
Tim Brooks 3d5e9114e3
Reduce connections used by MockNioTransport (#32620)
The MockNioTransport (similar to the MockTcpTransport) is used for integ
tests. The MockTcpTransport has always only opened a single for all of
its work. The MockNioTransport has awlays opened the default number of
connections (13). This means that every test where two transports
connect requires 26 connections. This is more than is necessary. This
commit modifies the MockNioTransport to only require 3 connections.
2018-08-07 12:52:28 -06:00
Lee Hinman b3e15851a2 [TEST] Comment out account breaker assertion while diagnosing
Relates to #30290
2018-08-07 09:36:37 -06:00
Armin Braun 0a67cb4133
LOGGING: Upgrade to Log4J 2.11.1 (#32616)
* LOGGING: Upgrade to Log4J 2.11.1
* Upgrade to `2.11.1` to fix memory leaks in slow logger when logging large requests
   * This was caused by a bug in Log4J https://issues.apache.org/jira/browse/LOG4J2-2269 and is fixed in `2.11.1` via https://git-wip-us.apache.org/repos/asf?p=logging-log4j2.git;h=9496c0c
* Fixes #32537
* Fixes #27300
2018-08-06 14:56:21 +02:00
Armin Braun 6fa7016bbf
SCRIPTING: Move Aggregation Scripts to their own context (#32068)
* SCRIPTING: Move Aggregation Scripts to their own context
2018-08-04 10:37:07 +02:00
Yannick Welsch 0d60e8a029
Fix race between replica reset and primary promotion (#32442)
We've recently seen a number of test failures that tripped an assertion in IndexShard (see issues
linked below), leading to the discovery of a race between resetting a replica when it learns about a
higher term and when the same replica is promoted to primary. This commit fixes the race by
distinguishing between a cluster state primary term (called pendingPrimaryTerm) and a shard-level
operation term. The former is set during the cluster state update or when a replica learns about a
new primary. The latter is only incremented under the operation block, which can happen in a
delayed fashion. It also solves the issue where a replica that's still adjusting to the new term
receives a cluster state update that promotes it to primary, which can happen in the situation of
multiple nodes being shut down in short succession. In that case, the cluster state update thread
would call `asyncBlockOperations` in `updateShardState`, which in turn would throw an exception
as blocking permits is not allowed while an ongoing block is in place, subsequently failing the shard.
This commit therefore extends the IndexShardOperationPermits to allow it to queue multiple blocks
(which will all take precedence over operations acquiring permits). Finally, it also moves the primary
activation of the replication tracker under the operation block, so that the actual transition to
primary only happens under the operation block.

Relates to #32431, #32304 and #32118
2018-08-03 09:33:08 +02:00
Yannick Welsch db6e8c736d
Remove cluster state initial customs (#32501)
This infrastructure was introduced in #26144 and made obsolete in #30743
2018-08-02 15:49:59 +02:00
Jay Modi f2f33f3149 Use hostname instead of IP with SPNEGO test (#32514)
This change updates KerberosAuthenticationIT to resolve the host used
to connect to the test cluster. This is needed because the host could
be an IP address but SPNEGO requires a hostname to work properly. This
is done by adding a hook in ESRestTestCase for building the HttpHost
from the host and port.

Additionally, the project now specifies the IPv4 loopback address as
the http host. This is done because we need to be able to resolve the
address used for the HTTP transport before the node starts up, but the
http.ports file is not written until the node is started.

Closes #32498
2018-08-01 12:57:33 +10:00
Nik Everett 22459576d7
Logging: Make node name consistent in logger (#31588)
First, some background: we have 15 different methods to get a logger in
Elasticsearch but they can be broken down into three broad categories
based on what information is provided when building the logger.

Just a class like:
```
private static final Logger logger = ESLoggerFactory.getLogger(ActionModule.class);
```
or:
```
protected final Logger logger = Loggers.getLogger(getClass());
```

The class and settings:
```
this.logger = Loggers.getLogger(getClass(), settings);
```

Or more information like:
```
Loggers.getLogger("index.store.deletes", settings, shardId)
```

The goal of the "class and settings" variant is to attach the node name
to the logger. Because we don't always have the settings available, we
often use the "just a class" variant and get loggers without node names
attached. There isn't any real consistency here. Some loggers get the
node name because it is convenient and some do not.

This change makes the node name available to all loggers all the time.
Almost. There are some caveats are testing that I'll get to. But in
*production* code the node name is node available to all loggers. This
means we can stop using the "class and settings" variants to fetch
loggers which was the real goal here, but a pleasant side effect is that
the ndoe name is now consitent on every log line and optional by editing
the logging pattern. This is all powered by setting the node name
statically on a logging formatter very early in initialization.

Now to tests: tests can't set the node name statically because
subclasses of `ESIntegTestCase` run many nodes in the same jvm, even in
the same class loader. Also, lots of tests don't run with a real node so
they don't *have* a node name at all. To support multiple nodes in the
same JVM tests suss out the node name from the thread name which works
surprisingly well and easy to test in a nice way. For those threads
that are not part of an `ESIntegTestCase` node we stick whatever useful
information we can get form the thread name in the place of the node
name. This allows us to keep the logger format consistent.
2018-07-31 10:54:24 -04:00