database/mariadb-columnstore-engine
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ColumnStore Cache changes.

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1. Add a new system variable, columnstore_use_cpimport_for_cache_inserts,
  that when set to ON, uses cpimport for the cache flush into ColumnStore.
  This variable is set to OFF by default. By default, we perform batch inserts
  for the cache flush.

  2. Disable DMLProc logging of the SQL statement text for the cache
  flush operation in case of batch inserts. Under certain heavy loads
  involving INSERT statements, this logging becomes a bottleneck for
  the cache flush, causing subsequent inserts into the cache table to hang.
This commit is contained in:
Gagan Goel
2021-07-07 14:01:47 +00:00
parent 866dc25729
commit a0bd790005
8 changed files with 55 additions and 7 deletions
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8
dbcon/mysql/ha_mcs_impl.cpp
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@ -3040,9 +3040,13 @@ void ha_mcs_impl_start_bulk_insert(ha_rows rows, TABLE* table, bool is_cache_ins
if (((thd->lex)->sql_command == SQLCOM_INSERT) && (rows > 0))
ci->useCpimport = mcs_use_import_for_batchinsert_mode_t::OFF;
// For now, disable cpimport for cache inserts
if (ci->isCacheInsert)
ci->useCpimport = mcs_use_import_for_batchinsert_mode_t::OFF;
{
if (get_use_cpimport_for_cache_inserts(thd))
ci->useCpimport = mcs_use_import_for_batchinsert_mode_t::ALWAYS;
else
ci->useCpimport = mcs_use_import_for_batchinsert_mode_t::OFF;
}
// ci->useCpimport = mcs_use_import_for_batchinsert_mode_t::ALWAYS means ALWAYS use
// cpimport, whether it's in a transaction or not. User should use this option