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BUG#26286 (row-based logging scales worse than statement-based logging):

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Submitting patch on Guilhem's behalf (he found the solution).
  
Correcting a typo that caused very big increases in memory usage when
more memory needed to be allocated for row-based events. Also correcting
a border case check when more memory needed to be allocated.


sql/log_event.cc:
  Correcting typo that caused very big increases in memory allocation.
  Correcting border case for when more memory should be allocated.
This commit is contained in:
unknown 2007-02-24 14:33:45 +01:00
parent f60346193e
commit 13bee852c5
1 changed files with 3 additions and 3 deletions
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6
sql/log_event.cc
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@ -5515,13 +5515,13 @@ int Rows_log_event::do_add_row_data(byte *const row_data,
DBUG_ASSERT(m_rows_cur <= m_rows_end);
/* The cast will always work since m_rows_cur <= m_rows_end */
if (static_cast<my_size_t>(m_rows_end - m_rows_cur) < length)
if (static_cast<my_size_t>(m_rows_end - m_rows_cur) <= length)
{
my_size_t const block_size= 1024;
my_ptrdiff_t const old_alloc= m_rows_end - m_rows_buf;
my_ptrdiff_t const cur_size= m_rows_cur - m_rows_buf;
my_ptrdiff_t const new_alloc=
block_size * ((cur_size + length) / block_size + block_size - 1);
block_size * ((cur_size + length + block_size - 1) / block_size);
byte* const new_buf= (byte*)my_realloc((gptr)m_rows_buf, new_alloc,
MYF(MY_ALLOW_ZERO_PTR|MY_WME));
@ -5542,7 +5542,7 @@ int Rows_log_event::do_add_row_data(byte *const row_data,
m_rows_end= m_rows_buf + new_alloc;
}
DBUG_ASSERT(m_rows_cur + length < m_rows_end);
DBUG_ASSERT(m_rows_cur + length <= m_rows_end);
memcpy(m_rows_cur, row_data, length);
m_rows_cur+= length;
m_row_count++;