/**
* Regression test for KUDU-1226. Calls to session.flush() concurrent with AUTO_FLUSH_BACKGROUND
* can end up giving ConvertBatchToListOfResponsesCB a list with nulls if a tablet was already
* flushed. Only happens with multiple tablets.
*/
@Test(timeout = 10000)
public void testConcurrentFlushes() throws Exception {
String tableName = TABLE_NAME_PREFIX + "-testConcurrentFlushes";
CreateTableOptions builder = new CreateTableOptions();
int numTablets = 4;
int numRowsPerTablet = 100;
// Create a 4 tablets table split on 1000, 2000, and 3000.
for (int i = 1; i < numTablets; i++) {
PartialRow split = basicSchema.newPartialRow();
split.addInt(0, i * numRowsPerTablet);
builder.addSplitRow(split);
}
table = createTable(tableName, basicSchema, builder);
// Configure the session to background flush as often as it can (every 1ms).
KuduSession session = syncClient.newSession();
session.setFlushMode(SessionConfiguration.FlushMode.AUTO_FLUSH_BACKGROUND);
session.setFlushInterval(1);
// Fill each tablet in parallel 1 by 1 then flush. Without the fix this would quickly get an
// NPE.
for (int i = 0; i < numRowsPerTablet; i++) {
for (int j = 0; j < numTablets; j++) {
session.apply(createInsert(i + (numRowsPerTablet * j)));
}
session.flush();
}
}
