* 1. Mysql default transaction isolation is REPEATABLE_READ, treat it as READ_COMMITTED will reduce insert id conflict.
2. Add an index to 'dataSource used end' is work well for the most of scenarios(get recently segments), and it will speed up sync add pending segments in DB.
3. 'select and insert' is not need within transaction.
* Use TaskLockbox.doInCriticalSection instead of synchronized syntax to speed up insert pending segments.
* fix typo for NullPointerException
* remove consumer.listTopics() method
* add consumerLock and exception handling for consumer.partitionFor() and remove some useless checks
* add check in case consumer.partitionsFor() returns null
* fix CI failure
* fix failed UT
* Revert "fix CI failure"
This reverts commit f839d09e1e.
* revert unless commit and re-commit the useful part to fix failed UT
* use a sha512 hash of bloom filter for cache key instead of filter bytes
* make serde private, BloomDimFilter.toString and BloomDimFilter.equals use hash instead of bloomKFilter which has no tostring or equals of its own
* keep and use HashCode object instead of converting to bytes up front
* uneeded imports oops
* tweaks from review
* refactor dupe code
* refactor
* include mysql-metadata-storage extension in distribution, but without the GPL-licensed connector library
* Install mysql connector package
* use symlinks to avoid versioning issues
* add documentation for fetching the mysql connector
* Apache-ize POM
* put revision information into MANIFEST.MF for binary release
* remove nightly profile
* fix flaky travis by overriding maven-remote-resources-plugin execution from the parent POM
* SQL: Support for selecting multi-value dimensions.
Fixes#4637. Doesn't completely address everything mentioned in #4638,
but at least fixes one issue on the way there.
* Fix null cases in tests.
@gianm gauge `emitter/buffers/failed` and `emitter/buffers/totalAllocated` metrics proved to be very inconvenient in practice: they are not additive across a fleet of nodes, are randomly reset when a JVM restarts (that may be completely independent from metrics emitting issues). Regarding [problem identification](https://github.com/apache/incubator-druid/pull/4973#issuecomment-338119125), `emitter/buffers/dropped` serves this well.
Currently in this PR I added `/delta` vs. `/total` metrics, but if there are no objections I would remove `/total` and so align `emitter/buffers/allocated` and `/failed` with `/dropped` and `/events/emitted` which are already delta-only.
* Use NodeType enum instead of Strings
* Make NodeType constants uppercase
* Fix CommonCacheNotifier and NodeType/ServerType comments
* Reconsidering comment
* Fix import
* Add a comment to CommonCacheNotifier.NODE_TYPES
* add PrefixFilteredDimensionSpec for multi-value dimensions
* add docs for PrefixFilteredDimensionSpec
* remove unnecessary null handling
* add null check to the result of NullHandling
* o- Query Response format to be based on http 'accept' header & Query Payload contenty type to be based on 'content-type' header
* o- Query Response format to be based on http 'accept' header & Query Payload contenty type to be based on 'content-type' header
o- if Accept header is absent, it defaults to Content-Type header
* Feature: Query Response format to be based on http 'accept' header & Query Payload content type to be based on 'content-type' PR #4033
Minor change to a comment - restoring to previous wording
* Feature: Query Response format to be based on http 'accept' header & Query Payload content type to be based on 'content-type' PR #4033
o- minor change to check for empty string
* Fix inconsistent segment size(#6448)
* Fix the segment size for published segments
* Changes to get numReplicas
* Make coordinator segments API truly streaming
* Changes to store partial segment data
* Simplify SegmentMetadataHolder
* Store partial the columns from available segments
* Address comments
* Add optional `name` to top level of FilteredAggregatorFactory
* Add compat constructor for tests
* Address comments
* Add equals and hash code updates
* Rename test
* Fix imports and code style
* Added SystemSchema with following tables (#5989)
* SEGMENTS table provides details on served and published segments
* SERVERS table provides details on data servers
* SERVERSEGMETS table is the JOIN of SEGMENTS and SERVERS
* TASKS table provides details on tasks
* Add documentation for system schema
* Fix static-analysis warnings
* Address PR comments
*Add unit tests
* Fix a test
* Try to fix a test
* Fix a bug around replica count
* rename io.druid to org.apache.druid
* Major change is to make tasks and segment queries streaming
* Made tasks/segments stream to calcite instead of storing it in memory
* Add num_rows to segments table
* Refactor JsonParserIterator
* Replace with closeable iterator
* Fix docs, make num_rows column nullable, some unit test changes
* make num_rows column type long, allow it to be null
fix a compile error after merge, add TrafficCop param to InputStreamResponseHandler
* Filter null rows for segments table from Linq4j enumerable
* change num_replicas datatype to long in segments table
* Fix some tests and address comments
* Doc updates, other PR comments
* Update tests
* Address comments
* Add auth check
* Update docs
* Refactoring
* Fix teamcity warning, change the getQueryableServer in TimelineServerView
* Fix compilation after rebase
* Use the stream API from AuthorizationUtils
* Added LeaderClient interface and NoopDruidLeaderClient class
* Revert "Added LeaderClient interface and NoopDruidLeaderClient class"
This reverts commit 100fa46e39.
* Make the naming consistent to server_segments for the join table
* Add ForbiddenException on auth check failure
* Remove static block from SystemSchema
* Try to fix a test in CalciteQueryTest due to rename of server_segments
* Fix the json output format in the coordinator API
* Add auth check in the segments API
* Add null check to avoid NPE
* Use annonymous class object instead of mock for DruidLeaderClient in SqlBenchmark
* Fix test failures, type long/BIGINT can be nullable
* Revert long nullability to fix tests
* Fix style for tests
* PR comments
* Address PR comments
* Add the missing BytesAccumulatingResponseHandler class
* Use Sequences.withBaggage in DruidPlanner
* Fix docs, add comments
* Close the iterator if hasNext returns false
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