add filer support

weed/filer/mysql_store/mysql_store_test.go

@@ -0,0 +1,60 @@
+package mysql_store
+
+import (
+	"encoding/json"
+	"hash/crc32"
+	"testing"
+)
+
+/*
+To improve performance when storing billion of files, you could shar
+At each mysql instance, we will try to create 1024 tables if not exist, table name will be something like:
+filer_mapping_0000
+filer_mapping_0001
+.....
+filer_mapping_1023
+sample conf should be
+
+>$cat filer_conf.json
+{
+    "mysql": [
+        {
+            "User": "root",
+            "Password": "root",
+            "HostName": "127.0.0.1",
+            "Port": 3306,
+            "DataBase": "seaweedfs"
+        },
+        {
+            "User": "root",
+            "Password": "root",
+            "HostName": "127.0.0.2",
+            "Port": 3306,
+            "DataBase": "seaweedfs"
+        }
+    ]
+}
+*/
+
+func TestGenerateMysqlConf(t *testing.T) {
+	var conf MySqlConf
+	conf = append(conf, MySqlInstConf{
+		User:     "root",
+		Password: "root",
+		HostName: "localhost",
+		Port:     3306,
+		DataBase: "seaweedfs",
+	})
+	body, err := json.Marshal(conf)
+	if err != nil {
+		t.Errorf("json encoding err %s", err.Error())
+	}
+	t.Logf("json output is %s", string(body))
+}
+
+func TestCRC32FullPathName(t *testing.T) {
+	fullPathName := "/prod-bucket/law632191483895612493300-signed.pdf"
+	hash_value := crc32.ChecksumIEEE([]byte(fullPathName))
+	table_postfix := int(hash_value) % 1024
+	t.Logf("table postfix %d", table_postfix)
+}