feat: batch write is not enabled by default

packaging/cfg/taos.cfg

@@ -311,11 +311,11 @@ keepColumnName            1
 # unit Hour. Latency of data migration
 # keepTimeOffset     0
 
-# enable thread local write batching.
-# writeBatchThreadLocal   0
+# taosc write batch size, maximum 4096, suggested value 64 ~ 512, default 0, 0 means disable write batching.
+# writeBatchSize        0
 
-# taosc write batch size, maximum 4096, 0 means disabled write batching. suggesting value: 64 ~ 512.
-# writeBatchSize     96
+# taosc write batch timeout in milliseconds, maximum 2048, suggested value 2 ~ 100, default 10.
+# writeBatchTimeout     10
 
-# taosc write batch timeout in milliseconds, maximum 2048. suggesting value: 2 ~ 100.
-# writeBatchTimeout  10
+# using thread local write batching. this option is not available when writeBatchSize = 0.:::
+# writeBatchThreadLocal 0
\ No newline at end of file

src/client/src/tscAsync.c

@@ -411,7 +411,7 @@ void doAsyncQuery(STscObj* pObj, SSqlObj* pSql, __async_cb_func_t fp, void* para
 
 // TODO return the correct error code to client in tscQueueAsyncError
 void taos_query_a(TAOS *taos, const char *sqlstr, __async_cb_func_t fp, void *param) {
-  taos_query_ra(taos, sqlstr, fp, param, true);
+  taos_query_ra(taos, sqlstr, fp, param, tsWriteBatchSize > 0);
 }
 
 TAOS_RES * taos_query_ra(TAOS *taos, const char *sqlstr, __async_cb_func_t fp, void *param, bool enableBatch) {

src/common/src/tglobal.c

@@ -129,7 +129,7 @@ int64_t tsMaxRetentWindow = 24 * 3600L;  // maximum time window tolerance
 
 // The tsc async write batching feature (using ABWD).
 bool    tsWriteBatchThreadLocal = false;    // if thread local enable, each thread will allocate a dispatcher.
-int32_t tsWriteBatchSize = 96;              // suggest: 64 - 512, 0 means disable batching.
+int32_t tsWriteBatchSize = 0;               // suggest: 64 - 512, default 0, 0 means disable batching.
 int32_t tsWriteBatchTimeout = 10;           // suggest: 2 - 100 (unit: milliseconds)
 
 // the maximum allowed query buffer size during query processing for each data node.