feat(memory): implement true message batching for flush_messages()#256
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jariy17 wants to merge 4 commits intofeat/event-metadata-state-identificationfrom
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feat(memory): implement true message batching for flush_messages()#256jariy17 wants to merge 4 commits intofeat/event-metadata-state-identificationfrom
jariy17 wants to merge 4 commits intofeat/event-metadata-state-identificationfrom
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Add optional batch_size parameter to AgentCoreMemoryConfig that allows customers to buffer messages before sending to AgentCore Memory. Changes: - Add batch_size parameter (default=1, max=100) to AgentCoreMemoryConfig - Add message buffering with thread-safe _message_buffer and _buffer_lock - Modify create_message() to buffer when batch_size > 1 - Add flush_messages() to send all buffered messages - Add pending_message_count() to check buffer size - Add close() and context manager for cleanup - Add 24 unit tests covering batching functionality Default batch_size=1 preserves backward compatibility (immediate send).
Previously, batch_size buffered messages but still made N separate API calls for N messages. Now flush_messages() groups conversational messages by session_id and combines them into a single create_event() call per session, significantly reducing API calls. Key changes: - Group conversational messages by session_id into combined payloads - Preserve message order within each session's payload (earliest first) - Use the latest timestamp from grouped messages for the combined event - Send blob messages (>9KB) individually (different API path) - Clear buffer only after ALL API calls succeed to prevent data loss - Improve error messages to include session context Tests added for critical scenarios: - Multiple sessions grouped into separate API calls - Latest timestamp used for combined events - Partial failure with multiple sessions preserves entire buffer - Multiple blob messages sent individually (not batched) - Mixed sessions with blobs and conversational messages Also fixes pre-existing test issues: - Fix test_read_agent_legacy_migration mock setup to match actual impl - Fix test_load_long_term_memories_with_validation_failure for strands API
jariy17
commented
Feb 6, 2026
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| # region Batching support | ||
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| def flush_messages(self) -> list[dict[str, Any]]: |
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this should be private method.
| """ | ||
| self.flush_messages() | ||
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| # endregion Batching support |
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Why is this a comment?
| Returns: | ||
| int: Number of buffered messages waiting to be sent. | ||
| """ | ||
| with self._buffer_lock: |
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There must be a some atomic library that would incorporate the lock whenever you do operations in _message_buffer.
| return [] | ||
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| results = [] | ||
| for session_id, messages, is_blob, monotonic_timestamp in messages_to_send: |
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this is not actually buffering right now.
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you can take all the messages_to_send and put it under messages, if it's not a blob. https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/bedrock-agentcore/client/create_event.html. Make sure the messages are ordered in the earilers to latest when storing in one create_event.
Extract _create_session_manager helper to eliminate triple-nested context managers and move batching_config/batching_session_manager to module-level fixtures shared across all test classes.
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Summary
batch_sizeconfiguration option for message buffering (1-100, default 1)flush_messages()- groups conversational messages by session_id into single API callsTest plan
pytest tests/bedrock_agentcore/memory/integrations/strands/test_agentcore_memory_session_manager.py -k "Batching" -v