This commit does two things:
* Allow users to plug-in different implementations of the handler (they must extend HealthCheckHandler)
* Remove the HealthCheckHandler from the implicit SolrCore plugins
Add IndexWriter merge-on-refresh feature to selectively merge
small segments on getReader, subject to a configurable timeout,
to improve search performance by reducing the number of small
segments for searching.
Co-authored-by: Mike McCandless <mikemccand@apache.org>
This commit introduces CPU based circuit breaker. This circuit breaker
tracks the average CPU load per minute and triggers if the value exceeds
a configurable value.
This commit also adds a specific control flag for Memory Circuit Breaker
to allow enabling/disabling the same.
This commit introduces two functionalities: request rate limiting and ability to identify requests based on type (indexing, search, admin). The default rate limiter rate limits query requests based on configurable parameters which can be set in web.xml. Note that this rate limiting works at a JVM level, not a core/collection level.
This issue occurs only while fetching uncommitted doc through /get.
Instead of directly calling stringValue() on IndexableField use
FieldType's toExtern() or toObject() to get the writable value for the field.
* SolrRrdBackendFactory should not be created if history is disabled
* Disable MetricsHistoryHandler by default in tests
* Await shutdown of all executors
(minor refactoring)
Also:
* SolrCore's constructors don't need a "name" since it's guaranteed to always be the name in the coreDescriptor. I checked.
* SolrCore's constructor shouldn't call coreContainer.solrCores.addCoreDescriptor(cd); because it's the container's responsibility to manage such things. I made SolrCores.putCore ensure the descriptor is added, and this is called by CoreContainer.registerCore which is called after new SolrCore instances are created.
* solrCore.setName should only be called when we expect the name to change. Furthermore that shouldn't ever happen in SolrCloud so I added checks.
* solrCore.setName calls coreMetricManager.afterCoreSetName() which is something that is really only related to a rename, not name initialization (from the constructor). I renamed that method and further only call it if the name did change from non-null.
