[close #380] make gRPC idle timeout configurable (#379)

src/main/java/org/tikv/common/ConfigUtils.java

@@ -27,7 +27,8 @@ public class ConfigUtils {
   public static final String TIKV_GRPC_SCAN_TIMEOUT = "tikv.grpc.scan_timeout_in_ms";
   public static final String TIKV_GRPC_SCAN_BATCH_SIZE = "tikv.grpc.scan_batch_size";
   public static final String TIKV_GRPC_MAX_FRAME_SIZE = "tikv.grpc.max_frame_size";
-
+  public static final String TIKV_GRPC_IDLE_TIMEOUT = "tikv.grpc.idle_timeout";
+
   public static final String TIKV_INDEX_SCAN_BATCH_SIZE = "tikv.index.scan_batch_size";
   public static final String TIKV_INDEX_SCAN_CONCURRENCY = "tikv.index.scan_concurrency";
   public static final String TIKV_TABLE_SCAN_CONCURRENCY = "tikv.table.scan_concurrency";
@@ -146,6 +147,8 @@ public class ConfigUtils {
   public static final String FOLLOWER = "FOLLOWER";
   public static final String LEADER_AND_FOLLOWER = "LEADER_AND_FOLLOWER";
 
+  public static final int DEF_TIKV_GRPC_IDLE_TIMEOUT = 60;
+
   public static final boolean DEF_TiKV_CIRCUIT_BREAK_ENABLE = false;
   public static final int DEF_TiKV_CIRCUIT_BREAK_AVAILABILITY_WINDOW_IN_SECONDS = 60;
   public static final int DEF_TiKV_CIRCUIT_BREAK_AVAILABILITY_ERROR_THRESHOLD_PERCENTAGE = 100;

src/main/java/org/tikv/common/TiConfiguration.java

@@ -112,6 +112,7 @@ private static void loadFromDefaultProperties() {
     setIfMissing(TIKV_GRPC_HEALTH_CHECK_TIMEOUT, DEF_CHECK_HEALTH_TIMEOUT);
     setIfMissing(TIKV_HEALTH_CHECK_PERIOD_DURATION, DEF_HEALTH_CHECK_PERIOD_DURATION);
     setIfMissing(TIKV_RAWKV_DEFAULT_BACKOFF_IN_MS, DEF_TIKV_RAWKV_DEFAULT_BACKOFF_IN_MS);
+    setIfMissing(TIKV_GRPC_IDLE_TIMEOUT, DEF_TIKV_GRPC_IDLE_TIMEOUT);
     setIfMissing(TIKV_RAWKV_READ_TIMEOUT_IN_MS, DEF_TIKV_RAWKV_READ_TIMEOUT_IN_MS);
     setIfMissing(TIKV_RAWKV_WRITE_TIMEOUT_IN_MS, DEF_TIKV_RAWKV_WRITE_TIMEOUT_IN_MS);
     setIfMissing(TIKV_RAWKV_BATCH_READ_TIMEOUT_IN_MS, DEF_TIKV_RAWKV_BATCH_READ_TIMEOUT_IN_MS);
@@ -341,7 +342,7 @@ private static ReplicaRead getReplicaRead(String key) {
   private Optional<Integer> rawKVBatchWriteSlowLogInMS =
       getIntOption(TIKV_RAWKV_BATCH_WRITE_SLOWLOG_IN_MS);
   private int rawKVScanSlowLogInMS = getInt(TIKV_RAWKV_SCAN_SLOWLOG_IN_MS);
-
+  private int idleTimeout = getInt(TIKV_GRPC_IDLE_TIMEOUT);
   private boolean circuitBreakEnable = getBoolean(TiKV_CIRCUIT_BREAK_ENABLE);
   private int circuitBreakAvailabilityWindowInSeconds =
       getInt(TiKV_CIRCUIT_BREAK_AVAILABILITY_WINDOW_IN_SECONDS);
@@ -666,6 +667,14 @@ public void setRawKVDefaultBackoffInMS(int rawKVDefaultBackoffInMS) {
     this.rawKVDefaultBackoffInMS = rawKVDefaultBackoffInMS;
   }
 
+  public int getIdleTimeout() {
+    return idleTimeout;
+  }
+
+  public void setIdleTimeout(int timeout) {
+    this.idleTimeout = timeout;
+  }
+
   public int getRawKVReadTimeoutInMS() {
     return rawKVReadTimeoutInMS;
   }

src/main/java/org/tikv/common/TiSession.java

@@ -77,7 +77,7 @@ public TiSession(TiConfiguration conf) {
     this.metricsServer = MetricsServer.getInstance(conf);
 
     this.conf = conf;
-    this.channelFactory = new ChannelFactory(conf.getMaxFrameSize());
+    this.channelFactory = new ChannelFactory(conf.getMaxFrameSize(), conf.getIdleTimeout());
     this.client = PDClient.createRaw(conf, channelFactory);
     this.enableGrpcForward = conf.getEnableGrpcForward();
     if (this.enableGrpcForward) {

src/main/java/org/tikv/common/util/ChannelFactory.java

@@ -25,10 +25,12 @@
 
 public class ChannelFactory implements AutoCloseable {
   private final int maxFrameSize;
+  private final int idleTimeout;
   private final ConcurrentHashMap<String, ManagedChannel> connPool = new ConcurrentHashMap<>();
 
-  public ChannelFactory(int maxFrameSize) {
+  public ChannelFactory(int maxFrameSize, int idleTimeout) {
     this.maxFrameSize = maxFrameSize;
+    this.idleTimeout = idleTimeout;
   }
 
   public ManagedChannel getChannel(String addressStr, HostMapping hostMapping) {
@@ -52,7 +54,7 @@ public ManagedChannel getChannel(String addressStr, HostMapping hostMapping) {
           return ManagedChannelBuilder.forAddress(mappedAddr.getHost(), mappedAddr.getPort())
               .maxInboundMessageSize(maxFrameSize)
               .usePlaintext()
-              .idleTimeout(60, TimeUnit.SECONDS)
+              .idleTimeout(idleTimeout, TimeUnit.SECONDS)
               .build();
         });
   }

src/test/java/org/tikv/common/TiConfigurationTest.java

@@ -26,4 +26,15 @@ public void configFileTest() {
     TiConfiguration conf = TiConfiguration.createRawDefault();
     assertEquals("configFileTest", conf.getDBPrefix());
   }
+
+  @Test
+  public void testGrpcIdleTimeoutValue() {
+    TiConfiguration conf = TiConfiguration.createDefault();
+    // default value
+    assertEquals(TiConfiguration.getInt(ConfigUtils.TIKV_GRPC_IDLE_TIMEOUT), conf.getIdleTimeout());
+    // new value
+    int newValue = 100000;
+    conf.setIdleTimeout(newValue);
+    assertEquals(newValue, conf.getIdleTimeout());
+  }
 }