drill

2da618cd - DRILL-2245: Clean up query setup and execution kickoff in Foreman/WorkManager in order to ensure consistent handling, and avoid hangs and races, with the goal of improving Drillbit robustness.

DRILL-2245: Clean up query setup and execution kickoff in Foreman/WorkManager in order to ensure consistent handling, and avoid hangs and races, with the goal of improving Drillbit robustness. I did my best to keep these clean when I split them up, but this core commit may depend on some minor changes in the hygiene commit that is also associated with this bug, so either both should be applied, or neither. The core commit should be applied first. protocol/pom.xml - updated protocol buffer compiler version to 2.6 - this made slight modifications to the formats of a few committed protobuf files AutoCloseables - created org.apache.drill.common.AutoCloseables to handle closing these quietly BaseTestQuery, and derivatives - factored out pieces into QueryTestUtil so they can be reused DeferredException: - created this so we can collect exceptions during the shutdown process Drillbit - uses AutoCloseables for the WorkManager and for the storeProvider - allow start() to take a RemoteServiceSet - private, final, formatting Foreman - added new state CANCELLATION_REQUESTED (via UserBitShared.proto) to represent the time between request of a cancellation, and acknowledgement from all remote endpoints running fragments on a query's behalf - created ForemanResult to manage interleaving cleanup effects/failure with query result state - does not need to implement Comparable - does not need to implement Closeable - thread blocking fixes - add resultSent flag - add code to log plan fragments with endpoint assignments - added finals, cleaned up formatting - do queue management in acquireQuerySemaphore; local tests pass - rename getContext() to getQueryContext() - retain DrillbitContext - a couple of exception injections for testing - minor formatting - TODOs FragmentContext - added a DeferredException to collect errors during startup/shutdown sequences FragmentExecutor - eliminated CancelableQuery - use the FragmentContext's DeferredException for errors - common subexpression elimination - cleaned up QueryContext - removed unnecessary functions (with some outside classes tweaked for this) - finals, formatting QueryManager - merge in QueryStatus - affects Foreman, ../batch/ControlHandlerImpl, and ../../server/rest/ProfileResources - made some methods private - removed unused imports - add finals and formatting - variable renaming to improve readability - formatting - comments - TODOs QueryStatus - getAsInfo() private - member renaming - member access changes - formatting - TODOs QueryTestUtil, BaseTestQuery, TestDrillbitResilience - make maxWidth a parameter to server startup SelfCleaningRunnable - created org.apache.drill.common.SelfCleaningRunnable SingleRowListener - created org.apache.drill.SingleRowListener results listener - use in TestDrillbitResilience TestComparisonFunctions - fix not to close the FragmentContext multiple times TestDrillbitResilience - created org.apache.drill.exec.server.TestDrillbitResilience to test drillbit resilience in the face of exceptions and failures during queries TestWithZookeeper - factor out work into ZookeeperHelper so that it can be reused by TestDrillbitResilience UserBitShared - get rid of unused UNKNOWN_QUERY WorkEventBus - rename methods, affects Foreman and ControlHandlerImpl - remove unused WorkerBee reference - most members final - formatting WorkManager - Closeable to AutoCloseable - removed unused incomingFragments Set - eliminated unnecessary eventThread and pendingTasks by posting Runnables directly to executor - use SelfCleaningRunnable for Foreman management - FragmentExecutor management uses SelfCleaningRunnable - runningFragments to be a ConcurrentHashMap; TestTpchDistributed passes - other improvements due to bee no longer needed in various places - most members final - minor formatting - comments - TODOs (*) Created exception injection classes to simulate exceptions for testing - ExceptionInjection - ExceptionInjector - ExceptionInjectionUtil - TestExceptionInjection DRILL-2245-hygiene: General code cleanup encountered while working on the rest of this commit. This includes - making members final whenever possible - making members private whenever possible - making loggers private - removing unused imports - removing unused private functions - removing unused public functions - removing unused local variables - removing unused private members - deleting unused files - cleaning up formatting - adding spaces before braces in conditionals and loop bodies - breaking up overly long lines - removing extra blank lines While I tried to keep this clean, this commit may have minor dependencies on DRILL-2245-core that I missed. The intention is just to break this up for review purposes. Either both commits should be applied, or neither.