More v5 adjustments

README.md

@@ -50,8 +50,8 @@ For development:
 | max_pool_size | Number | Maximum number of connections to open to the SQL server at any 1 time | No | 5 |
 | connection_timeout | Number | Number of seconds before a SQL connection is closed | No | 2800 |
 | flush_size | Number | Maximum number of entries to buffer before sending to SQL - if this is reached before idle_flush_time | No | 1000 |
-| max_flush_exceptions | Number | Number of sequential flushes which cause an exception, before the set of events are discarded. Set to a value less than 1 if you never want it to stop. This should be carefully configured with respect to retry_initial_interval and retry_max_interval, if your SQL server is not highly available | No | 0 |
+| max_flush_exceptions | Number | Number of sequential flushes which cause an exception, before the set of events are discarded. Set to a value less than 1 if you never want it to stop. This should be carefully configured with respect to retry_initial_interval and retry_max_interval, if your SQL server is not highly available | No | 10 |
-| retry_initial_interval | Number | Number of seconds before the initial retry in the event of a failure | No | 2 |
+| retry_initial_interval | Number | Number of seconds before the initial retry in the event of a failure. On each failure it will be doubled until it reaches retry_max_interval | No | 2 |
 | retry_max_interval | Number | Maximum number of seconds between each retry | No | 128 |
 
 ## Example configurations

lib/logstash/outputs/jdbc.rb

@@ -9,6 +9,40 @@ require "logstash-output-jdbc_jars"
 class LogStash::Outputs::Jdbc < LogStash::Outputs::Base
   STRFTIME_FMT = "%Y-%m-%d %T.%L".freeze
 
+  # Will never work, but only because it duplicates data (i.e. duplicate keys)
+  # Will throw a warning.
+  SQL_STATES_IGNORE = [
+    ### Constraint Violation 
+    # Integrity constraint violation.
+    23000,
+    # A violation of the constraint imposed by a unique index or a unique constraint occurred.
+    23505
+  ]
+
+  # Will never work because of SQL statement errors.
+  # Will throw an error.
+  SQL_STATES_FATAL = [
+    ### Data Exception
+    # Character data, right truncation occurred. Field too small.
+    22001,
+    # Numeric value out of range.
+    22003,
+    # A null value is not allowed.
+    22004,
+    # Invalid datetime format.
+    22007,
+    # A parameter or host variable value is invalid.
+    22023,
+    # Character conversion resulted in truncation.
+    22524,
+
+    ### Constraint Violation 
+    # The insert or update value of a foreign key is invalid.
+    23503,
+    # The range of values for the identity column or sequence is exhausted.
+    23522
+  ]
+
   config_name "jdbc"
 
   # Driver class - Reintroduced for https://github.com/theangryangel/logstash-output-jdbc/issues/26
@@ -58,7 +92,8 @@ class LogStash::Outputs::Jdbc < LogStash::Outputs::Base
 
   # Maximum number of sequential failed attempts, before we stop retrying.
   # If set to < 1, then it will infinitely retry.
-  config :max_flush_exceptions, :validate => :number, :default => 0
+  # At the default values this is a little over 10 minutes
+  config :max_flush_exceptions, :validate => :number, :default => 10 
 
   config :max_repeat_exceptions, :obsolete => "This has been replaced by max_flush_exceptions - which behaves slightly differently. Please check the documentation."
   config :max_repeat_exceptions_time, :obsolete => "This is no longer required"
@@ -157,52 +192,7 @@ class LogStash::Outputs::Jdbc < LogStash::Outputs::Base
     end
   end
       
-  def submit_safe(events)
+  def submit(events)
-    connection = nil
-    statement = nil
-    events_to_retry = []
-    begin
-      connection = @pool.getConnection()
-    rescue => e
-      log_jdbc_exception(e)
-      return events
-    end
-
-    begin
-      statement = connection.prepareStatement(@statement[0])
-      events.each do |event|
-        next if event.cancelled?
-        next if @statement.length < 2
-        statement = add_statement_event_params(statement, event)
-
-        statement.addBatch()
-      end
-      statement.executeBatch()
-    rescue java.sql.BatchUpdateException => e
-      # Only retry the failed items from the batch
-      updates = e.getUpdateCounts()
-      events_to_retry = events
-      updates.each_with_index{ |update, idx|
-        if (update != java.sql.Statement.EXECUTE_FAILED)
-          # Remove any successful events
-          events_to_retry[idx] = nil
-        end
-      }
-      # Remove the nil entries
-      events_to_retry = events_to_retry.compact
-      log_jdbc_exception(e)
-    rescue => e
-      events_to_retry = events
-      log_jdbc_exception(e)
-    ensure
-      statement.close() unless statement.nil?
-    end
-
-    connection.close() unless connection.nil?    
-    return events_to_retry
-  end
-
-  def submit_unsafe(events)
     connection = nil
     statement = nil
     events_to_retry = []
@@ -216,16 +206,30 @@ class LogStash::Outputs::Jdbc < LogStash::Outputs::Base
 
     events.each do |event|
       begin
-        statement = connection.prepareStatement(event.sprintf(@statement[0]))
+        if @unsafe_statement == true
+          statement = connection.prepareStatement(event.sprintf(@statement[0]))
+        else
+          statement = connection.prepareStatement(@statement[0])
+        end
+        
         statement = add_statement_event_params(statement, event) if @statement.length > 1
 
         statement.execute()
+      rescue java.sql.SQLException => e
+        if SQL_STATES_IGNORE.include? e.getSQLState()
+          @logger.warn('JDBC - Dropping event. Ignore-able exception (duplicate key most likely)', exception: e, event: event)
+        elsif SQL_STATES_FATAL.include? e.getSQLState()
+          @logger.error('JDBC - Fatal SQL exception. Can never succeed. Dropping event.', exception: e, event: event)
+        else
+          log_jdbc_exception(e)
+          events_to_retry.push(event)
+        end
       rescue => e
+        # Something else happened.
         log_jdbc_exception(e)        
         events_to_retry.push(event)
       ensure
         statement.close() unless statement.nil?
-        statement = nil
       end
     end
     
@@ -243,29 +247,21 @@ class LogStash::Outputs::Jdbc < LogStash::Outputs::Base
     sleep_interval = @retry_initial_interval
     while submit_actions && submit_actions.length > 0
       return if !submit_actions || submit_actions.empty? # If everything's a success we move along
-      # We retry with whatever is didn't succeed
+      # We retry whatever didn't succeed
-      begin
+      submit_actions = submit(submit_actions)
-        if @unsafe_statement == true
+
-          submit_actions = submit_unsafe(submit_actions)
+      # Everything was a success!
-        else
+      break if !submit_actions || submit_actions.empty?
-          submit_actions = submit_safe(submit_actions)
-        end
-      rescue => e
-        log_jdbc_exception(e)
-      end
 
       if @max_flush_exceptions > 0
         attempts += 1
 
         if attempts > @max_flush_exceptions
-          @logger.error("JDBC - max_flush_exceptions has been reached")
+          @logger.error("JDBC - max_flush_exceptions has been reached. #{submit_actions.length} events have been unable to be sent to SQL and are being dropped. See previously logged exceptions for details.")
           break
         end
       end
 
-      # Everything was a success!
-      break if !submit_actions || submit_actions.empty?
-
       # If we're retrying the action sleep for the recommended interval
       # Double the interval for the next time through to achieve exponential backoff
       Stud.stoppable_sleep(sleep_interval) { @stopping.true? }
@@ -313,7 +309,7 @@ class LogStash::Outputs::Jdbc < LogStash::Outputs::Base
   def log_jdbc_exception(exception)
     current_exception = exception
     loop do
-      @logger.error("JDBC Exception encountered: Will automatically retry.", :exception => current_exception)
+      @logger.warn("JDBC Exception encountered: Will automatically retry.", :exception => current_exception)
       current_exception = current_exception.getNextException()
       break if current_exception == nil
     end

scripts/minutes_to_retries.rb

@@ -0,0 +1,20 @@
+#!/usr/bin/env ruby -w
+
+seconds_to_reach = 10 * 60
+default_interval = 2
+retry_max_interval = 128
+
+current_interval = 2
+total_interval = 0
+exceptions_count = 1
+
+loop do
+  break if total_interval > seconds_to_reach  
+  exceptions_count += 1
+  
+  current_interval = current_interval*2 > retry_max_interval ? retry_max_interval : current_interval*2
+
+  total_interval += current_interval
+end
+
+puts exceptions_count