[GitHub] [beam] pabloem commented on a change in pull request #15429: Add per-batch metrics to JdbcIO.write

[GitBox <gi...@apache.org>]

pabloem commented on a change in pull request #15429:
URL: https://github.com/apache/beam/pull/15429#discussion_r699634493



##########
File path: sdks/java/io/jdbc/src/main/java/org/apache/beam/sdk/io/jdbc/JdbcIO.java
##########
@@ -1694,6 +1700,7 @@ private void executeBatch() throws SQLException, IOException, InterruptedExcepti
         if (records.isEmpty()) {
           return;
         }
+        Long startTimeNs = System.nanoTime();

Review comment:
       `currentTimeMillis` may be affected by clock adjustments in the machine, while `nanoTime` measures ellapsed time in the machine, so it will not be affected by that.

##########
File path: sdks/java/io/jdbc/src/main/java/org/apache/beam/sdk/io/jdbc/JdbcIO.java
##########
@@ -1694,6 +1700,7 @@ private void executeBatch() throws SQLException, IOException, InterruptedExcepti
         if (records.isEmpty()) {
           return;
         }
+        Long startTimeNs = System.nanoTime();

Review comment:
       https://stackoverflow.com/questions/1770010/how-do-i-measure-time-elapsed-in-java




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