Merge pull request #5760 from smatvienko-tb/sql_batch_thread_count_better_hash_distribution

[3.3.3] SQL and TS batch thread count 3 for better hash distribution

application/src/main/resources/thingsboard.yml

@@ -265,17 +265,17 @@ sql:
     batch_size: "${SQL_ATTRIBUTES_BATCH_SIZE:10000}"
     batch_max_delay: "${SQL_ATTRIBUTES_BATCH_MAX_DELAY_MS:100}"
     stats_print_interval_ms: "${SQL_ATTRIBUTES_BATCH_STATS_PRINT_MS:10000}"
-    batch_threads: "${SQL_ATTRIBUTES_BATCH_THREADS:4}"
+    batch_threads: "${SQL_ATTRIBUTES_BATCH_THREADS:3}" # batch thread count have to be a prime number like 3 or 5 to gain perfect hash distribution
   ts:
     batch_size: "${SQL_TS_BATCH_SIZE:10000}"
     batch_max_delay: "${SQL_TS_BATCH_MAX_DELAY_MS:100}"
     stats_print_interval_ms: "${SQL_TS_BATCH_STATS_PRINT_MS:10000}"
-    batch_threads: "${SQL_TS_BATCH_THREADS:4}"
+    batch_threads: "${SQL_TS_BATCH_THREADS:3}" # batch thread count have to be a prime number like 3 or 5 to gain perfect hash distribution
   ts_latest:
     batch_size: "${SQL_TS_LATEST_BATCH_SIZE:10000}"
     batch_max_delay: "${SQL_TS_LATEST_BATCH_MAX_DELAY_MS:100}"
     stats_print_interval_ms: "${SQL_TS_LATEST_BATCH_STATS_PRINT_MS:10000}"
-    batch_threads: "${SQL_TS_LATEST_BATCH_THREADS:4}"
+    batch_threads: "${SQL_TS_LATEST_BATCH_THREADS:3}" # batch thread count have to be a prime number like 3 or 5 to gain perfect hash distribution
     update_by_latest_ts: "${SQL_TS_UPDATE_BY_LATEST_TIMESTAMP:true}"
   # Specify whether to sort entities before batch update. Should be enabled for cluster mode to avoid deadlocks
   batch_sort: "${SQL_BATCH_SORT:false}"
@@ -290,7 +290,7 @@ sql:
   timescale:
     # Specify Interval size for new data chunks storage.
     chunk_time_interval: "${SQL_TIMESCALE_CHUNK_TIME_INTERVAL:604800000}"
-    batch_threads: "${SQL_TIMESCALE_BATCH_THREADS:4}"
+    batch_threads: "${SQL_TIMESCALE_BATCH_THREADS:3}" # batch thread count have to be a prime number like 3 or 5 to gain perfect hash distribution
   ttl:
     ts:
       enabled: "${SQL_TTL_TS_ENABLED:true}"