• Manish Kumar's avatar
    BUG#12400221 - 60926: BINARY LOG EVENTS LARGER THAN MAX_ALLOWED_PACKET · 9aa79dc5
    Manish Kumar authored
    Problem
    ========
                
    SQL statements close to the size of max_allowed_packet produce binary
    log events larger than max_allowed_packet.
                  
    The reason why this failure is occuring is because the event length is
    more than the total size of the max_allowed_packet + max_event_header
    length. Now since the event length exceeds this size master Dump
    thread is unable to send the packet on to the slave.
                          
    That can happen e.g with row-based replication in Update_rows event.
                
    Fix
    ====
              
    The problem was fixed by increasing the max_allowed_packet for the
    slave's threads (IO/SQL) by increasing it to 1GB.
    This is done using the new server option included which is used to
    regulate the max_allowed_packet of the slave thread (IO/SQL).
    This causes the large packets to be received by the slave and apply
    it successfully.
    9aa79dc5
log_event.cc 313 KB