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Document log_position param in client_service::prepare_data_for_replication()

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Daniele Sciascia
2019-02-14 08:53:20 +01:00
parent 68adbe35f6
commit e02f617d5f
1 changed files with 6 additions and 1 deletions
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7
include/wsrep/client_service.hpp
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@ -100,12 +100,17 @@ namespace wsrep
/** /**
* Prepare a buffer containing data for the next fragment to replicate. * Prepare a buffer containing data for the next fragment to replicate.
* The caller may set log_position to record the database specific
* position corresponding to changes contained in the buffer.
* When the call returns, the log_position will be available to read
* from streaming_context::log_position().
* *
* @return Zero in case of success, non-zero on failure. * @return Zero in case of success, non-zero on failure.
* If there is no data to replicate, the method shall return * If there is no data to replicate, the method shall return
* zero and leave the buffer empty. * zero and leave the buffer empty.
*/ */
virtual int prepare_fragment_for_replication(wsrep::mutable_buffer&, size_t&) = 0; virtual int prepare_fragment_for_replication(wsrep::mutable_buffer& buffer,
size_t& log_position) = 0;
/** /**
* Remove fragments from the storage within current transaction. * Remove fragments from the storage within current transaction.