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improve the PublicTopicReaderPartitionExpiredError description #869

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Merged
vgvoleg merged 1 commit into from
Aug 3, 2026
Merged

improve the PublicTopicReaderPartitionExpiredError description #869

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17 changes: 14 additions & 3 deletions ydb/_topic_reader/topic_reader_asyncio.py
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Original file line number Diff line number Diff line change
Expand Up @@ -54,9 +54,20 @@ class PublicTopicReaderUnexpectedCodecError(YdbError):

class PublicTopicReaderPartitionExpiredError(TopicReaderError):
"""
Commit message when partition read session are dropped.
It is ok - the message/batch will not commit to server and will receive in other read session
(with this or other reader).
This error is raised when trying to commit a message/batch that belongs to
a partition read session that has already ended (expired).

A partition read session can end for several reasons, e.g.:
- the reader reconnected to the server (connection was lost and restored);
- the partition was rebalanced to another reader in the same consumer group.

This is an expected situation, not a bug. The message/batch simply will not be
committed to the server, and will be delivered again in a new read session
(either by this reader or by another reader in the same consumer group).

You do not need to recreate the reader when this error occurs - it can be
safely ignored. Just be prepared that the same message may be received more
than once (at-least-once delivery semantics).
"""

def __init__(self, message: str = "Topic reader partition session is closed"):
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