Update LogRecord batching processor behavior description

specification/configuration/sdk-environment-variables.md

@@ -208,6 +208,8 @@ Depending on the value of `OTEL_TRACES_SAMPLER`, `OTEL_TRACES_SAMPLER_ARG` may b
 
 ## Batch Span Processor
 
+Refer to the Trace SDK [Batching processor specification](../trace/sdk/#batching-processor) for more information on these configuration parameters.
+
 | Name                           | Description                                                      | Default | Type         | Notes                                                                             |
 |--------------------------------|------------------------------------------------------------------|---------|--------------|-----------------------------------------------------------------------------------|
 | OTEL_BSP_SCHEDULE_DELAY        | Delay interval (in milliseconds) between two consecutive exports | 5000    | [Duration][] |                                                                                   |
@@ -217,6 +219,8 @@ Depending on the value of `OTEL_TRACES_SAMPLER`, `OTEL_TRACES_SAMPLER_ARG` may b
 
 ## Batch LogRecord Processor
 
+Refer to the Logs SDK [Batching processor specification](../logs/sdk/#batching-processor) for more information on these configuration parameters.
+
 | Name                            | Description                                                      | Default | Type         | Notes                                                                              |
 |---------------------------------|------------------------------------------------------------------|---------|--------------|------------------------------------------------------------------------------------|
 | OTEL_BLRP_SCHEDULE_DELAY        | Delay interval (in milliseconds) between two consecutive exports | 1000    | [Duration][] |                                                                                    |

specification/logs/sdk.md

@@ -421,6 +421,20 @@ representations to the configured `LogRecordExporter`.
 The processor MUST synchronize calls to `LogRecordExporter`'s `Export`
 to make sure that they are not invoked concurrently.
 
+The processor SHOULD export a batch when any of the following happens AND the
+previous export call has returned:
+
+- `scheduledDelayMillis` after the processor is constructed OR the first `LogRecord`
+  is received by the log record processor.
+- `scheduledDelayMillis` after the previous export timer ends, OR the previous
+  export completes, OR the first `LogRecord` is added to the queue after the previous
+  export timer ends or previous batch completes.
+- The queue contains `maxExportBatchSize` or more `LogRecord`s.
+- `ForceFlush` is called.
+
+If the queue is empty when an export is triggered, the processor MAY export
+an empty batch OR skip the export and consider it to be completed immediately.
+
 **Configurable parameters:**
 
 * `exporter` - the exporter where the `LogRecord`s are pushed.
@@ -431,7 +445,9 @@ to make sure that they are not invoked concurrently.
 * `exportTimeoutMillis` - how long the export can run before it is cancelled.
   The default value is `30000`.
 * `maxExportBatchSize` - the maximum batch size of every export. It must be
-  smaller or equal to `maxQueueSize`. The default value is `512`.
+  smaller or equal to `maxQueueSize`. If the queue reaches `maxExportBatchSize`
+  a batch will be exported even if `scheduledDelayMillis` milliseconds have not
+  elapsed. The default value is `512`.
 
 ## LogRecordExporter