InvisibleProgrammer commented on code in PR #5174:
URL: https://github.com/apache/hive/pull/5174#discussion_r1547328886
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ql/src/java/org/apache/hadoop/hive/ql/exec/tez/HiveSplitGenerator.java:
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@@ -154,6 +165,90 @@ private void prepare(InputInitializerContext
initializerContext) throws IOExcept
LOG.info("SplitLocationProvider: " + splitLocationProvider);
}
+ /**
+ * SplitSerializer is a helper class for taking care of serializing splits
to the tez scratch dir
+ * when a size criteria defined by
"hive.tez.split.fs.serialization.threshold" is met.
+ * It utilizes an ExecutorService for parallel writes to prevent a single
split write operation
+ * becoming the bottleneck (as write() is called from a loop currently).
+ */
+ class SplitSerializer {
+ // fields needed for filepath
+ private String queryId;
+ private String inputName;
+ private int vertexId;
+ private Path appStagingPath;
+ // metrics
+ private AtomicInteger timeSpentWithSplitWriteMs = new AtomicInteger(0);
Review Comment:
What is the reason why all the private fields are initialized in `lazyInit`
but the AtomicInteger fields are not?
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