文件名称:
HBase全局一致性事务支持Tephra.zip
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文件大小: 603kb
下载次数: 0
上传时间: 2019-07-19
详细说明：
Tephra 在 Apache HBase 的基础上提供了全局一致性的事务支持。HBase 提供了强一致性的基于行和区域的 ACID 操作支持，但是牺牲了在跨区域操作的支持。这就要求应用开发者花很大力气来确保区域边界上操作的一致性。而 Tephra 提供了全局事务支持，可以夸区域、跨表以及多个 RPC 上简化了应用的开发。示例代码： /** * A Transactional SecondaryIndexTable. */ public class SecondaryIndexTable { private byte[] secondaryIndex; private TransactionAwareHTable t ransactionAwareHTable; private TransactionAwareHTable secondaryIndexTable; private TransactionContext transactionContext; private final TableName secondaryIndexTableName; private static final byte[] secondaryIndexFamily = Bytes.toBytes("secondaryIndexFamily"); private static final byte[] secondaryIndexQualifier = Bytes.toBytes(r); private static final byte[] DELIMITER = new byte[] {0}; public SecondaryIndexTable(TransactionServiceClient transactionServiceClient, HTable hTable, byte[] secondaryIndex) { secondaryIndexTableName = TableName.valueOf(hTable.getName().getNameAsString() ".idx"); HTable secondaryIndexHTable = null; HBaseAdmin hBaseAdmin = null; try { hBaseAdmin = new HBaseAdmin(hTable.getConfiguration()); if (!hBaseAdmin.tableExists(secondaryIndexTableName)) { hBaseAdmin.createTable(new HTableDescriptor(secondaryIndexTableName)); } secondaryIndexHTable = new HTable(hTable.getConfiguration(), secondaryIndexTableName); } catch (Exception e) { Throwables.propagate(e); } finally { try { hBaseAdmin.close(); } catch (Exception e) { Throwables.propagate(e); } } this.secondaryIndex = secondaryIndex; this.transactionAwareHTable = new TransactionAwareHTable(hTable); this.secondaryIndexTable = new TransactionAwareHTable(secondaryIndexHTable); this.transactionContext = new TransactionContext(transactionServiceClient, transactionAwareHTable, secondaryIndexTable); } public Result get(Get get) throws IOException { return get(Collections.singletonList(get))[0]; } public Result[] get(List gets) throws IOException { try { transactionContext.start(); Result[] result = transactionAwareHTable.get(gets); transactionContext.finish(); return result; } catch (Exception e) { try { transactionContext.abort(); } catch (TransactionFailureException e1) { throw new IOException("Could not rollback transaction", e1); } } return null; } public Result[] getByIndex(byte[] value) throws IOException { try { transactionContext.start(); Scan scan = new Scan(value, Bytes.add(value, new byte[0])); scan.addColumn(secondaryIndexFamily, secondaryIndexQualifier); ResultScanner indexScanner = secondaryIndexTable.getScanner(scan); ArrayList gets = new ArrayList(); for (Result result : indexScanner) { for (Cell cell : result.listCells()) { gets.add(new Get(cell.getValue())); } } Result[] results = transactionAwareHTable.get(gets); transactionContext.finish(); return results; } catch (Exception e) { try { transactionContext.abort(); } catch (TransactionFailureException e1) { throw new IOException("Could not rollback transaction", e1); } } return null; } public void put(Put put) throws IOException { put(Collections.singletonList(put)); } public void put(List puts) throws IOException { try { transactionContext.start(); ArrayList secondaryIndexPuts = new ArrayList(); for (Put put : puts) { List indexPuts = new ArrayList(); Set>> familyMap = put.getFamilyMap().entrySet(); for (Map.Entry> family : familyMap) { for (KeyValue value : family.getValue()) { if (value.getQualifier().equals(secondaryIndex)) { byte[] secondaryRow = Bytes.add(value.getQualifier(), DELIMITER, Bytes.add(value.getValue(), DELIMITER, value.getRow())); Put indexPut = new Put(secondaryRow); indexPut.add(secondaryIndexFamily, secondaryIndexQualifier, put.getRow()); indexPuts.add(indexPut); } } } secondaryIndexPuts.addAll(indexPuts); } transactionAwareHTable.put(puts); secondaryIndexTable.put(secondaryIndexPuts); transactionContext.finish(); } catch (Exception e) { try { transactionContext.abort(); } catch (TransactionFailureException e1) { throw new IOException("Could not rollback transaction", e1); } } } } 标签：Tephra
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