We made a small mistake when breaking out the `ESIntegTestCase`
subclasses that confused eclipse. This makes it happy again. Poor
eclipse!
Relates #55896
This commit creates a new gradle plugin to provide a separate task name
and source set for running ESIntegTestCase tests. The only project
converted to use the new plugin in this PR is server, as an example. The
remaining cases in x-pack will be handled in followups.
backport of #55896
Another Jackson release is available. There are some CVEs addressed,
none of which impact us, but since we can now bump Jackson easily, let
us move along with the train to avoid the false positives from security
scanners.
BuildPlugin is a catch all for any elasticsearch common build
infrastructure. Unfortunately that makes reusing parts of it difficult.
This commit splits the parts specific to all java based projects out to
our own elasticsearch.java plugin.
* Simplify java home verification
At one time, all uses of java home were found through the getJavaHome
utility method on BuildPlugin. However, that was changed many
refactorings ago, but the complex support for registering a java home
version needed that fails at configuration time still exists. The only
remaining use of grabbing java home is within bwc tests, and must be at
runtime since that is when we have the checkout and know what version is
needed.
This commit consolidates the java home finding method into a utility
unassociated with BuildPlugin.
* fix checkstyle
* address feedback
This commit adds `runtime.java` as a system property in our
nonInputProperties so that it will be available to be printed
upon test failure by ReproduceInfoPrinter.
A JSON schema was recently introduced for the REST API specification. #54252
This PR introduces a 3rd party validation tool to ensure that the
REST specification conforms to the schema.
The task is applied to the 3 projects that contain REST API specifications.
The plugin wires this task into the precommit commit task, and should be
considered as part of the public API for the build tools for any plugin
developer to contribute their plugin's specification.
An ignore parameter has been introduced for the task to allow specific
file to be ignored from the validation. The ignored files in this PR
will soon get issues logged and a link so they can be fixed.
Closes#54314
While the current version of forbidden apis still does not support java
14, the warning message has become very noisy as we now require java 14
for the elasticsearch build. This commit replaces the warn log message
with a comment in the code.
The "old jdk" tests are just testing support for downloading from oracle
prior to java 12.0.1, when oracle added a hash to the url. This commit
moves these tests into the openjdk tests (ie oracle download tests),
since adoptopenjdk does not have any change in behavior that needs to be
tested.
The pom files for our published artifacts are sent to maven central
during Elastic's release process, but we may not found out until then
that we have inadvertently broken the pom structure, as has happened
several times before. This commit adds validation of the pom file
specifically for the rules required by maven central.
Currently forbidden apis accounts for 800+ tasks in the build. These
tasks are aggressively created by the plugin. In forbidden apis 3.0, we
will get task avoidance
(https://github.com/policeman-tools/forbidden-apis/pull/162), but we
need to ourselves use the same task avoidance mechanisms to not trigger
these task creations. This commit does that for our foribdden apis
usages, in preparation for upgrading to 3.0 when it is released.
Upgrade to lucene 8.5.1 release that contains a bug fix for a bug that might introduce index corruption when deleting data from an index that was previously shrunk.
Backport of #55073.
We added tasks to build an ARM distribution and Docker image, but didn't
provide any way to run packaging tests against them. Add extra loops on
the possible Architecture values, and skip tasks that can't be run on
the current Architecture.
This change converts the module and plugin parameters
for testClusters to be lazy. Meaning that the values
are not resolved until they are actually used. This
removes the requirement to use project.afterEvaluate to
be able to resolve the bundle artifact.
Note - this does not completely remove the need for afterEvaluate
since it is still needed for the custom resource extension.
The secure_settings_password was never taken into consideration in
the ReloadSecureSettings API. This commit fixes that and adds
necessary REST layer testing. Doing so, it also:
- Allows TestClusters to have a password protected keystore
so that it can be set for tests.
- Adds a parameter to the run task so that elastisearch can
be run with a password protected keystore from source.
This commit includes a number of changes to reduce overall build
configuration time. These optimizations include:
- Removing the usage of the 'nebula.info-scm' plugin. This plugin
leverages jgit to load read various pieces of VCS information. This
is mostly overkill and we have our own minimal implementation for
determining the current commit id.
- Removing unnecessary build dependencies such as perforce and jgit
now that we don't need them. This reduces our classpath considerably.
- Expanding the usage lazy task creation, particularly in our
distribution projects. The archives and packages projects create
lots of tasks with very complex configuration. Avoiding the creation
of these tasks at configuration time gives us a nice boost.
ForbiddenApis task via the precommit task currently makes an assumption
that only the test and main source sets are present for any given project.
This commit removes that assumption and allows for any project source set's
compileClasspath class path to be added to the forbiddenApis classpath
configuration.
Guava was removed from Elasticsearch many years ago, but remnants of it
remain due to transitive dependencies. When a dependency pulls guava
into the compile classpath, devs can inadvertently begin using methods
from guava without realizing it. This commit moves guava to a runtime
dependency in the modules that it is needed.
Note that one special case is the html sanitizer in watcher. The third
party dep uses guava in the PolicyFactory class signature. However, only
calling a method on the PolicyFactory actually causes the class to be
loaded, a reference alone does not trigger compilation to look at the
class implementation. There we utilize a MethodHandle for invoking the
relevant method at runtime, where guava will continue to exist.
Change how we format exceptions to only wrap them as necessary. While
the config's overall philosophy is to put items one-per-line when
wrapping, in practice this is a little cumbersome for exception lists.
This commit migrates the RestIntegTestTask from groovy to Java.
No changes to logic should be included, however the following changes
are needed:
* Move Fixture interface to Java (Java can not depend on Groovy classes)
* Support lazy evaluation of non-input System parameters (can not use Groovy strings)
* Use constants for system property names
* Remove dead System property pass through code (the build plugin does this already)
Drop a nasty regex in our checkstyle config that I wrote a long time ago
in favor of a checkstyle extension. This is better because:
* It is faster. It saves a little more than a minute across the entire
build.
* It is easier to read. Who knew 100 lines of Java would be easier to
read than a regex, but it is.
* It has tests.
Backport of #54276.
Move and rename formatter config file, so that it is easier for
Eclipse users to import.
Also switch to an opt-out list for formatting. Instead of explcitly
listing projects that should be formatted, instead list projects
that should not be formatted. This means that any new projects will
automatically be formatted and checked.
Xpack license state contains a helper method to determine whether
security is disabled due to license level defaults. Most code needs to
know whether security is enabled, not disabled, but this method exists
so that the security being explicitly disabled can be distinguished from
licence level defaulting to disabled. However, in the case that security
is explicitly disabled, the handlers in question are never registered,
so security is implicitly not disabled explicitly, and thus we can share
a single method to know whether licensing is enabled.
This commit removes the configuration time vs execution time distinction
with regards to certain BuildParms properties. Because of the cost of
determining Java versions for configuration JDK locations we deferred
this until execution time. This had two main downsides. First, we had
to implement all this build logic in tasks, which required a bunch of
additional plumbing and complexity. Second, because some information
wasn't known during configuration time, we had to nest any build logic
that depended on this in awkward callbacks.
We now defer to the JavaInstallationRegistry recently added in Gradle.
This utility uses a much more efficient method for probing Java
installations vs our jrunscript implementation. This, combined with some
optimizations to avoid probing the current JVM as well as deferring
some evaluation via Providers when probing installations for BWC builds
we can maintain effectively the same configuration time performance
while removing a bunch of complexity and runtime cost (snapshotting
inputs for the GenerateGlobalBuildInfoTask was very expensive). The end
result should be a much more responsive build execution in almost all
scenarios.
(cherry picked from commit ecdbd37f2e0f0447ed574b306adb64c19adc3ce1)
This commit introduces aarch64 packaging, including bundling an aarch64
JDK distribution. We had to make some interesting choices here:
- ML binaries are not compiled for aarch64, so for now we disable ML on
aarch64
- depending on underlying page sizes, we have to disable class data
sharing
When depending on lucene snapshots we point maven at our own s3 backed
repository. However, in this case lucene packages should only be
retrieved from this location, and no other packages should ever be found
in that repo. This commit makes the maven repository exclusive to lucene
packages.
Prior to this commit Watcher explicitly copied test between two
projects with a copy task. This commit removes the explicit copy in favor
of adding the Watcher tests to the available restResources that may be
copied between projects.
This is how inter-project dependencies should be modeled. However, only
Watcher is included here since it is (currently) the only project with
inter-project test dependencies.
Re-applies the change from #53523 along with test fixes.
closes#53626closes#53624closes#53622closes#53625
Co-authored-by: Nik Everett <nik9000@gmail.com>
Co-authored-by: Lee Hinman <dakrone@users.noreply.github.com>
Co-authored-by: Jake Landis <jake.landis@elastic.co>
The multiline regex rule used to detect docs code snippets greater than
76 characters in length has considerable cost to. For the high level
rest client project alone, this was taking upwards of 3 minutes. This
commit updates the rule regex pattern to use non-greedy matching when
appropriate which results in a lot fewer backtracks and about a 70%
reduction in execution time on the high level rest client module.
This commit upgrades the jackson-databind depdendency to
2.8.11.6. Additionally, we revert a previous change that put
ingest-geoip on the version of jackson-databind from the version
properties file. This is because upgrading ingest-geoip to a later
version of jackson-databind also requires an upgrade to the geoip2
dependency which is currently blocked. Therefore, if we can get to a
point where we otherwise upgrade our Jackson dependencies, we do not
want ingest-geoip to automatically come along with it.
The jdk and distribution download plugins create fake ivy repositories,
and use group based repository filtering to ensure no other artifacts
try to resolve against the fake repos. Currently this works by adding a
blanket exclude to all repositories for the given group name. This
commit changes to using the new exclusiveContent feature in
Gradle to do the exclusion.
Lucene 8.5.0 release candidates are imminent. This commit upgrades master to use
the latest snapshot to check that there are no last-minute bugs or regressions.
This commit fixes ensures that for external builds
(e.g. plugin development) that the REST tests that are
copied are properly filtered to only include the API
by default.
The code prior to this change resulted in including both
the API and tests since the copy.include resulted as an
empty list by default since the stream is empty unless
explicitly configured.
related #52114fixes#53183
A recent PR #52114 introduced two new tasks to copy the REST api and tests.
A couple bugs were found in that initial PR that prevents the incremental
build from working as expected.
The pattern match of empty string is equivalent to match all and it was coded
as match none. Fixed with explicit checks against empty patterns.
The fileCollection.plus return value was ignored. Fixed by changing how the
input's fileTree is constructed.
If a project has an src/test/resources directory, and tests are being copied
without a rest-api-spec/test directory could result no-op. Masked by the other
bugs and fixed by minor changes to logic to determine if a project has tests.
We embed the :reaper project jar in the build-tools jar so we can spawn
a reaper process at build runtime. Due to this, the jar technically
isn't part of the test runtime classpath, but for input snapshotting
purposes, we should be treating it as such. Instead, because it lives
in META-INF, Gradle treats it as a normal file, which in practice means
its hash changes on every build (timestamps, etc).
This commit changes our input snapshotting strategy such that instead
we explicitly add the jar as an input to any test tasks using Gradle's
runtime classpath normalization strategy (ignore timestamps, jar entry
order, etc) and ignore the file in META-INF. This ensures that we can
properly cache test results for build-tools, why still ensuring that
changes to the :reaper project trigger reexecution of tests.
* Smarter copying of the rest specs and tests (#52114)
This PR addresses the unnecessary copying of the rest specs and allows
for better semantics for which specs and tests are copied. By default
the rest specs will get copied if the project applies
`elasticsearch.standalone-rest-test` or `esplugin` and the project
has rest tests or you configure the custom extension `restResources`.
This PR also removes the need for dozens of places where the x-pack
specs were copied by supporting copying of the x-pack rest specs too.
The plugin/task introduced here can also copy the rest tests to the
local project through a similar configuration.
The new plugin/task allows a user to minimize the surface area of
which rest specs are copied. Per project can be configured to include
only a subset of the specs (or tests). Configuring a project to only
copy the specs when actually needed should help with build cache hit
rates since we can better define what is actually in use.
However, project level optimizations for build cache hit rates are
not included with this PR.
Also, with this PR you can no longer use the includePackaged flag on
integTest task.
The following items are included in this PR:
* new plugin: `elasticsearch.rest-resources`
* new tasks: CopyRestApiTask and CopyRestTestsTask - performs the copy
* new extension 'restResources'
```
restResources {
restApi {
includeCore 'foo' , 'bar' //will include the core specs that start with foo and bar
includeXpack 'baz' //will include x-pack specs that start with baz
}
restTests {
includeCore 'foo', 'bar' //will include the core tests that start with foo and bar
includeXpack 'baz' //will include the x-pack tests that start with baz
}
}
```
We explicitly set the path for the temporary directory to use in test
tasks, but today this path is a relative path, relative to the current
working directory of the test task. The fact that we are using a
relative path here appears to be legacy, simply leftover from the days
of the Maven build. An absolute path is preferred here, since it's
explicit and we do not have to rely on everyone resolving the path
properly relative to the working directory.
Today we we set the test temporary directory explicitly by controling
java.io.tmpdir. Yet, we do not guarantee this directory exists, instead
relying on a test base class (LuceneTestCase) to create this directory
when it initializes. However, some of our tests do not rely on our test
framework, and thus do not have access to LuceneTestCase, instead
relying on RandomizedRunner directly. We should not be relying on the
temporary directory being implicitly created, instead guaranteeing that
it exists before test execution starts. This commit does that by
creating the test temporary directory before the test task executes (via
a doFirst).
This commit converts the sysv init tests from bats tests into the java
packaging tests. Since it is the last oss specific test, the bats oss
test task is also removed.
relates #46005
When docker-compose is required for a test fixture but is not
available, we warn log a message to this effect. This ends up being
noise during configuration, especially when working locally. This
commit changes the logging level of these messages to debug.
- Enable SunJGSS provider for Kerberos tests
- Handle the fact that in the decrypt method in KeyStoreWrapper might
not throw immediately when the GCM cipher is from BouncyCastle FIPS
and we end up with a DataInputStream that has reached it's end.
- Disable tests, jarHell, testingConventions for ingest attachment
plugin. We don't support this plugin (and document this) in FIPS
mode.
- Don't attempt to install ingest-attachment in smoke-test-plugins
Due to of a typo in the version regex pattern only the last digit of a major
version number is taken into consideration. So docker's version 17.0.1 is parsed
as 7.0.1.
While we use `== false` as a more visible form of boolean negation
(instead of `!`), the true case is implied and the true value does not
need to explicitly checked. This commit converts cases that have slipped
into the code checking for `== true`.
Backport of #51526.
Previous the formatter was breaking simple if/else statements (i.e.
without braces) onto separate lines, which could be fragile because the
formatter cannot also introduce braces. Instead, keep such expressions
on the same line.
Today we are repeatedly checking if the current build is a snapshot
build or not by reading the system property build.snapshot. This commit
formalizes this by adding a build parameter to indicate whether or not
the current build is a snapshot build.
This change changes the way to run our test suites in
JVMs configured in FIPS 140 approved mode. It does so by:
- Configuring any given runtime Java in FIPS mode with the bundled
policy and security properties files, setting the system
properties java.security.properties and java.security.policy
with the == operator that overrides the default JVM properties
and policy.
- When runtime java is 11 and higher, using BouncyCastle FIPS
Cryptographic provider and BCJSSE in FIPS mode. These are
used as testRuntime dependencies for unit
tests and internal clusters, and copied (relevant jars)
explicitly to the lib directory for testclusters used in REST tests
- When runtime java is 8, using BouncyCastle FIPS
Cryptographic provider and SunJSSE in FIPS mode.
Running the tests in FIPS 140 approved mode doesn't require an
additional configuration either in CI workers or locally and is
controlled by specifying -Dtests.fips.enabled=true
If a worktree is used, say for 7.x, and packaging tests are run, the
build within the VM will fail due to the parent checkout not being
accessible. This is because the path of the worktree is for the host
systtem, not the VM. This commit makes the git info unknown, just as if
the .git directory did not exist.
When building clusters for integration tests, today we install plugins
sequentially. We recently introduced the ability to install plugins in a
single invocation of the install plugin command. Using this can save
substantial time starting up JVMs. This commit changes the build
infrastructure to install multiple plugins at once when building
clusters for integration tests.
For the docs integration tests in particular, where we install many
plugins, this change makes a substantial difference. On my laptop, prior
to this change, installing the plugins sequentially took 115
seconds. After this change, it takes 14 seconds.
Tests in BuildPluginIT copy the workspace but exclude the build
directories based on whether the directory string representation
includes `/build/` or not. This check is problematic if the directory
of the project has a parent directory also named `build`. The change in
this commit checks to see if the path relative to the project directory
has any path parts equal to `build`.
Backport / reimplementation of #50786 on 7.x.
Opt-in `buildSrc` for automatic formatting. This required a config tweak
in order to pick up all the Java sources, and as a result more files are
now found in the Enrich plugin, that were previously missed.
I also moved the 2 Java files in `buildSrc/src/main/groovy` into the Java
directory, which required some follow-up changes.
The packed-refs support was using the original .git path, changed to use
the real .git directory after reference from worktree has been followed.
Relates #47464
This commit adds a cliSetup command that can be used to run arbitrary
bin scripts to setup a test cluster. This is the same as what was
previously called setupCommands in cluster formation tasks.
closes#50382
This commit adds a special run.datadir system property that may be
passed to `./gradlew run` which sets the root data directory used by the
task. While normally overriding the data path is not allowed for test
clusters, it is useful when experimenting with the run task.
closes#50338
This commit ensures the global info plugin is applied, which supplies
the isInternal flag used to determine whether distro download looks for
bwcVersions.
relates #50230
The testclusters shutdown code was killing child processes
of the ES JVM before the ES JVM. This causes any running
ML jobs to be recorded as failed, as the ES JVM notices that
they have disconnected from it without being told to stop,
as they would if they crashed. In many test suites this
doesn't matter because the test cluster will never be
restarted, but in the case of upgrade tests it makes it
impossible to test what happens when an ML job is running
at the time of the upgrade.
This change reverses the order of killing the ES process
tree such that the parent processes are killed before their
children. A list of children is stored before killing the
parent so that they can subsequently be killed (if they
don't exit by themselves as a side effect of the parent
dying).
Backport of #50175
This commit sets xpack.security.ssl.diagnose.trust to false in all
the nodes of our TestClusters when running integTest. This is needed
in 7.x because setting xpack.security.ssl.diagnose.trust to true
wraps SunJSSE TrustManager with our own DiagnosticTrustManager and
this is not allowed when SunJSSE is in FIPS mode.
An alternative would be to set `xpack.security.fips.enabled` to
true which would also implicitly disable
xpack.security.ssl.diagnose.trust but would have additional effects
(would require that we set PBKDF2 for password hashing algorithm in
all test clusters, would prohibit using JKS keystores in nodes even
if relevant tests have been muted in FIPS mode etc.)
The testclusters registory is a singleton extension element added to the
root project which tracks which test clusters are used throughout the
multi project. But having the same name as the extension used to
configure test clusters within each subprojects breaks using a single
project for an external plugin. This commit renames the registry
extension to make it unique.
closes#49787
This commit goes from using a JvmArgumentProvider to using the normal
Test task APIs for passing the `HeapDumpOnOutOfMemoryError` JVM
argument. This makes it simpler for subprojects, such as lang-painless
to override this setting if necessary.
Closes#49117
(cherry picked from commit e97c38ff8e862abdc1d7816c66f9869ed216031f)
We have a long history of advancing the required compiler to the newest
JDK. JDK 13 has been with us for awhile, but we were blocked from
upgrading since Gradle was not compatible with JDK 13. With the
advancement in our project to Gradle 6 which supports JDK 13, we can now
advance our minimum compiler version. This commit updates the minimum
compiler version to JDK 13.
The elasticsearch-node tools allow manipulating the on-disk cluster state. The tool is currently
unaware of plugins and will therefore drop custom metadata from the cluster state once the
state is written out again (as it skips over the custom metadata that it can't read). This commit
preserves unknown customs when editing on-disk metadata through the elasticsearch-node
command-line tools.
This upgrade required a few significant changes. Firstly, the build
scan plugin has been renamed, and changed to be a Settings plugin rather
than a project plugin so the declaration of this has moved to our
settings.gradle file. Second, we were using a rather old version of the
Nebula ospackage plugin for building deb and rpm packages, the migration
to the latest version required some updates to get things working as
expected as we had some workarounds in place that are no longer
applicable with the latest bug fixes.
(cherry picked from commit 87f9c16e2f8870e3091062cde37b43042c3ae1c5)
Move BuildParams class to 'minimumRuntime' source set to retain compatibility
with build-tools for builds using a Java 8 runtime.
Closes#49766
(cherry picked from commit 1059f823acdfa7a2f1f9bff21c7256dae4f3e23c)
When external plugin authors use build-tools, their integ tests depend
on the integ-test-zip artifact. However, this dependency was broken in
7.5.0 by accidentally removing the `@zip` qualifier on the maven
dependency, which works around the fact the pom for the integ-test-zip
claims the artifact is a pom instead of zip packaging. This commit
restores the workaround of using `@zip` until the pom can be fixed.
closes#49787
This rewrites long sort as a `DistanceFeatureQuery`, which can
efficiently skip non-competitive blocks and segments of documents.
Depending on the dataset, the speedups can be 2 - 10 times.
The optimization can be disabled with setting the system property
`es.search.rewrite_sort` to `false`.
Optimization is skipped when an index has 50% or more data with
the same value.
Optimization is done through:
1. Rewriting sort as `DistanceFeatureQuery` which can
efficiently skip non-competitive blocks and segments of documents.
2. Sorting segments according to the primary numeric sort field(#44021)
This allows to skip non-competitive segments.
3. Using collector manager.
When we optimize sort, we sort segments by their min/max value.
As a collector expects to have segments in order,
we can not use a single collector for sorted segments.
We use collectorManager, where for every segment a dedicated collector
will be created.
4. Using Lucene's shared TopFieldCollector manager
This collector manager is able to exchange minimum competitive
score between collectors, which allows us to efficiently skip
the whole segments that don't contain competitive scores.
5. When index is force merged to a single segment, #48533 interleaving
old and new segments allows for this optimization as well,
as blocks with non-competitive docs can be skipped.
Backport for #48804
Co-authored-by: Jim Ferenczi <jim.ferenczi@elastic.co>
Add a mirror of the maven repository of the shibboleth project
and upgrade opensaml and related dependencies to the latest
version available version
Resolves: #44947
This commit introduces a workaround for an issue related to our recent
notarization of distributions starting with the 6.8.5 release. An
unintended side effect of notarization was that the file entries of the
release tar all have a `./` prefix in the path. This causes a number of
issues, not least of which is that our Gradle extract tasks end up
copying an empty fileset to the destination directory. The workaround
here is imply to remove the leading `./` path segment from each file
when performing the extraction. For more details see this issue:
https://github.com/elastic/elasticsearch/issues/49417
The test task is configured to use the runtime java version, but there
are issues with the version of groovy used by gradle pre 6.0. In order
to workaround this, we use the Gradle JDK to execute the build-tools
tests.
Closes#49404Closes#49253
Tasks intending to use a particular java home provided by JAVA<N>_HOME
use the getJavaHome method, which verifies the given java home is
available, or will be if the task will run. However, the verification
logic was broken, in addition to unnecessarily delaying retrieving the
java home until runtime. This commit fixes the verification logic to run
at either config time, delaying verification, or at runtime which
immediately checks if java home is available.
closes#49153
This PR adds build configuration to use the `jdk-download` plugin with
unit tests when no runtime java is configured externally.
It's a first part in a longer chain of changes described in #40531.
This commit upgrades the JDK that is bundled with Windows from 13+33 to
13.0.1+9. Our other platforms have previously been upgraded but Windows
was delayed because the artifacts were not available at the time that we
made the previous upgrade.
Relates #48587
The bats tests require several distributions to all be built into a
single directory. The addition of docker packaging tests now cause the
bats tests to depend on docker, even though docker is not used there.
This commit filters out docker distributions from those that bats
depends on.
The RunTask is responsible for logging output from nodes to the console
and also stays active since we want the cluster to keep running.
However, the implementation of the logging and waiting resulted in a
spin loop that continually polls for data to have been written to one
of the nodes' output files. On my laptop, this causes an idle
invocation of `gradle run` to consume an entire core.
The JDK provides a method to be notified of changes to files through
the use of a WatchService. While a WatchService based implementation
for logging and waiting works, a delay of up to ten seconds is
encountered when running on macOS. This is due to the lack of a native
WatchService implementation that uses kqueue or FSEvents; the current
WatchService implementation in the JDK uses polling with a default
interval of ten seconds. While the interval can be changed
programmatically it is not an acceptable solution due to the need to
access the com.sun.nio.file.SensitivityWatchEventModifier enum, which
is in an internal package.
The change in this commit instead introduces a check to see if any data
was available to read and log. If no data is available in any of the
node output files, the thread sleeps for 100ms. This is enough time to
prevent consuming large amounts of cpu while still providing output to
the console in a timely fashion.