Flume自定義Hbase Sink的EventSerializer序列化類

    最近要分析公司的日誌，須要把日誌從flume打到hbase中，可是咱們的日誌因爲前期是存到MongoDb中的，因此都是Json格式的日誌，這時候使用flume自帶的SimpleHbaseEventSerializer和RegexHbaseEventSerializer這樣的就不行了，因而開始痛苦的看源碼，本身寫序列化的類（這裏須要注意，若是是在flume的hbasesink包下編寫的代碼，License信息必定要加上。就是最上面那段英文，要否則在運行的時候會報錯），比較簡單，編寫好類以後，編譯打包，傳到flume的lib目錄下，而後在配置agent的時候指定Serializer的類爲編寫的類便可。下面是代碼（類註釋沒貼出來，見諒哈）：

public class PRTMSAsyncHbaseEventSerializer implements AsyncHbaseEventSerializer {
	private byte[] table;//hbase表
	private byte[] cf;//列簇
	private byte[][] payload;//列集合
	private byte[][] payloadColumn;//列值
	private byte[] incrementColumn;
	private String rowSuffix;//roykey後綴
	private String rowPrefix;//rowkey前綴
	private byte[] incrementRow;
	private KeyType keyType;//rowkey後綴類型 
	private static final Logger logger = LoggerFactory.getLogger(PRTMSAsyncHbaseEventSerializer.class);

	@Override
	public void configure(Context context) {
		// TODO Auto-generated method stub
		//設置主鍵後綴類型，這裏使用時間戳
		keyType = KeyType.TS;
		if (iCol != null && !iCol.isEmpty()) {
			incrementColumn = iCol.getBytes(Charsets.UTF_8);
		}
		incrementRow = context.getString("incrementRow", "incRow").getBytes(Charsets.UTF_8);
	}

	@Override
	public void configure(ComponentConfiguration conf) {
		// TODO Auto-generated method stub

	}

	@Override
	public void initialize(byte[] table, byte[] cf) {
		// TODO Auto-generated method stub
		this.table = table;
		this.cf = cf;
	}
	/**
	 * 
	 * @Title: setEvent 
	 * @Description: 獲取日誌信息，並解析出HBase的列以及列的value值 
	 * @param event   
	 * @throws 
	 * @see org.apache.flume.sink.hbase.AsyncHbaseEventSerializer#setEvent(org.apache.flume.Event)
	 */
	@Override
	public void setEvent(Event event) {
		// TODO Auto-generated method stub
		//獲取日誌信息
		String log = new String(event.getBody(), StandardCharsets.UTF_8);
		//headers包含日誌中項目編號和host信息
		Map<String, String> headers = event.getHeaders();
		JsonReader jsonReader = new JsonReader(new StringReader(log));
		String name = "";
		String value = "";
		String path = "";
		Map<String, String> kv = new HashMap<String, String>();
		try {
			//解析日誌中的鍵值對緩存到map中
			jsonReader.beginObject();
			while (jsonReader.hasNext()) {
				name = jsonReader.nextName();
				value = jsonReader.nextString();
				if(name.equals("uri"))
					path = value.split(" ")[1];
				kv.put(name, value);
			}
			jsonReader.endObject();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		//解析headers中的項目id和服務host、路徑
		if(path.contains("?")){
			path = path.substring(0, path.indexOf("?"));
		}
		String pcode = headers.get("pcode");
		String host = headers.get("host");
		//將項目編號和服務器host添加到map中
		kv.put("pcode",pcode);
		kv.put("host", host);
		//初始化列和value數組
		this.payloadColumn = new byte[kv.keySet().size()][];
		this.payload = new byte[kv.keySet().size()][];
		int i = 0;
		//給hbase的列和value賦值
		for (String key : kv.keySet()) {
			this.payloadColumn[i] = key.getBytes();
			this.payload[i] = kv.get(key).getBytes();
			i++;
		}
		//設置rowkey的前綴 格式是項目編號+路徑
		
		this.rowSuffix = new StringBuilder(pcode).reverse().toString() + ":"+path+":"+kv.get("time");
	}
	
	@Override
	public List<PutRequest> getActions() {
		// TODO Auto-generated method stub
		List<PutRequest> actions = new ArrayList<PutRequest>();
		if (payloadColumn != null) {
			byte[] rowKey;
			try {
				rowKey = rowSuffix.getBytes();
				// for 循環，提交全部列和對於數據的put請求。
				for (int i = 0; i < this.payload.length; i++) {
					PutRequest putRequest = new PutRequest(table, rowKey, cf, payloadColumn[i], payload[i]);
					actions.add(putRequest);
				}

			} catch (Exception e) {
				throw new FlumeException("Could not get row key!", e);
			}
		}
		return actions;
	}

	@Override
	public List<AtomicIncrementRequest> getIncrements() {
		// TODO Auto-generated method stub
		List<AtomicIncrementRequest> actions = new ArrayList<AtomicIncrementRequest>();
		if (incrementColumn != null) {
			AtomicIncrementRequest inc = new AtomicIncrementRequest(table, incrementRow, cf, incrementColumn);
			actions.add(inc);
		}
		return actions;
	}
	@Override
	public void cleanUp() {
		// TODO Auto-generated method stub
	}

}