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mechanik20051988 authored
Client code errors or manual mistakes can create transactions that are
never closed. Such transaction will work as a memory leak. Implement
timeout for transactions after which they are rolled back.

Part of #6177

@TarantoolBot document
Title: ability to set timeout for transactions was implemented
Previously transactions are never closed until commit or rollback.
Timeout for transactions was implemented after which they are rolled
back. For these purpose, in `box.begin` the optional table parameter
was added. For example if user want to start transaction with timeout
3s, he should use `box.begin({timeout = 3})`. Also was implement new
configuration option `box.cfg.txn_timeout` which determines timeout for
transactions, for which the timeout was not explicitly set. By default
this option is set to infinity (TIMEOUT_INFINITY = 365 * 100 * 86400).
Also in C API was added new function to set timeout for transaction -
'box_txn_set_timeout'.
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