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- Committer: Jay Pipes
- Date: 2009-10-13 18:47:53 UTC
- mto: (1234.1.1 push) (1237.2.10 push)
- mto: This revision was merged to the branch mainline in revision 1193.
- Revision ID: jpipes@serialcoder-20091013184753-aw5v6tfk8x5ynej9
This patch does the following:
1) The transaction log now writes a 4-byte header containing the type of
message which follows the header. This allows us to future-proof the
transaction log in order to allow BLOBs to be written in chunks to the
log file along with GPB Transaction messages.
2) The algorithm which writes Transaction messages to the transaction log
has been improved. Instead of 3 separate calls to pwrite(), I have now
reduced that to a single call to pwrite() and a raw buffer is used to
construct the raw bytes that get written in bulk to the transaction log
at the atomic offset.
3) Update the transaction_reader and transaction_writer programs for the
above changes.
1) The transaction log now writes a 4-byte header containing the type of
message which follows the header. This allows us to future-proof the
transaction log in order to allow BLOBs to be written in chunks to the
log file along with GPB Transaction messages.
2) The algorithm which writes Transaction messages to the transaction log
has been improved. Instead of 3 separate calls to pwrite(), I have now
reduced that to a single call to pwrite() and a raw buffer is used to
construct the raw bytes that get written in bulk to the transaction log
at the atomic offset.
3) Update the transaction_reader and transaction_writer programs for the
above changes.
added
removed
drizzled/message/transaction_writer.cc
