[client-v2] Fix compression issue when concurrent requests

client-v2/src/main/java/com/clickhouse/client/api/internal/ClickHouseLZ4InputStream.java

@@ -67,7 +67,7 @@ public int read(byte[] b, int off, int len) throws IOException {
     static final byte MAGIC = (byte) 0x82;
     static final int HEADER_LENGTH = 25;
 
-    static final byte[] headerBuff = new byte[HEADER_LENGTH];
+    final byte[] headerBuff = new byte[HEADER_LENGTH];
 
     /**
      * Method ensures to read all bytes from the input stream.

client-v2/src/test/java/com/clickhouse/client/query/QueryServerContentCompressionTests.java

@@ -2,7 +2,7 @@
 
 public class QueryServerContentCompressionTests extends QueryTests {
     static {
-        System.setProperty("org.slf4j.simpleLogger.defaultLogLevel", "DEBUG");
+//        System.setProperty("org.slf4j.simpleLogger.defaultLogLevel", "DEBUG");
     }
     QueryServerContentCompressionTests() {
         super(true, false);

client-v2/src/test/java/com/clickhouse/client/query/QueryTests.java

@@ -66,13 +66,17 @@
 import java.util.Properties;
 import java.util.Random;
 import java.util.UUID;
+import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
 import java.util.concurrent.TimeUnit;
 import java.util.function.Consumer;
 import java.util.function.Function;
 import java.util.function.Supplier;
 import java.util.stream.BaseStream;
+import java.util.stream.IntStream;
 
 public class QueryTests extends BaseIntegrationTest {
 
@@ -1264,32 +1268,62 @@ public void testClientUseOwnTimeZone() {
 
     @Test
     public void testAsyncQuery() {
-        try (Client client = newClient().useAsyncRequests(true).build();
-             QueryResponse response =
+        try (Client client = newClient().useAsyncRequests(true).build()){
+             simpleRequest(client);
+        } catch (Exception e) {
+            Assert.fail("Failed to get server time zone from header", e);
+        }
+    }
+
+    protected void simpleRequest(Client client) throws Exception {
+        try (QueryResponse response =
                      client.query("SELECT number FROM system.numbers LIMIT 1000_000").get(1, TimeUnit.SECONDS)) {
-                ClickHouseBinaryFormatReader reader =
-                        new RowBinaryWithNamesAndTypesFormatReader(response.getInputStream(), response.getSettings());
+            ClickHouseBinaryFormatReader reader =
+                    new RowBinaryWithNamesAndTypesFormatReader(response.getInputStream(), response.getSettings());
 
-                int count = 0;
-                while (reader.hasNext()) {
-                    reader.next();
-                    count++;
-                }
+            int count = 0;
+            while (reader.hasNext()) {
+                reader.next();
+                count++;
+            }
 
-                Assert.assertEquals(count, 1000_000);
-        } catch (Exception e) {
-            Assert.fail("Failed to get server time zone from header", e);
+            Assert.assertEquals(count, 1000_000);
         }
     }
 
-    private Client.Builder newClient() {
+    @Test
+    public void testConcurrentQueries() throws Exception{
+        final Client client = newClient().build();
+        final int concurrency = 10;
+        CountDownLatch latch = new CountDownLatch(concurrency);
+        Runnable task = () -> {
+            try {
+                simpleRequest(client);
+            } catch (Exception e) {
+                e.printStackTrace();
+                Assert.fail("Failed", e);
+            } finally {
+                latch.countDown();
+            }
+        };
+
+        ExecutorService executor = Executors.newFixedThreadPool(concurrency);
+        IntStream.range(0,concurrency).forEach(i -> executor.submit(task));
+        executor.shutdown();
+        executor.awaitTermination(10, TimeUnit.SECONDS);
+        latch.await();
+        Assert.assertEquals(latch.getCount(), 0);
+    }
+
+    protected Client.Builder newClient() {
         ClickHouseNode node = getServer(ClickHouseProtocol.HTTP);
         return new Client.Builder()
                 .addEndpoint(Protocol.HTTP, node.getHost(), node.getPort(), false)
                 .setUsername("default")
                 .setPassword("")
                 .compressClientRequest(false)
-                .compressServerResponse(false)
+                .compressServerResponse(true)
+                .useHttpCompression(useHttpCompression)
                 .useNewImplementation(System.getProperty("client.tests.useNewImplementation", "true").equals("true"));
     }
 }

examples/demo-service/src/main/java/com/clickhouse/demo_service/DbConfiguration.java

@@ -17,7 +17,6 @@ public Client chDirectClient(@Value("${db.url}") String dbUrl, @Value("${db.user
                 .addEndpoint(dbUrl)
                 .setUsername(dbUser)
                 .setPassword(dbPassword)
-                .compressServerResponse(false)
                 .useNewImplementation(true) // using new transport layer implementation
 
                 // sets the maximum number of connections to the server at a time