java - 如何使用 RowDeletingIterator

Question

我正在尝试使用 RowDeletingIterator 删除我的 Accumulo 表中的条目，但是当我之后扫描该表时，这些条目并没有被删除。假设这里的表中有一个row_id条目tableName就是我正在做的事情：

Connection connection = new ZooKeeperInstance(instance, zookeepers).getConnector(username, new PasswordToken(password));
String tableName = "tableName";
connection.tableOperations().create(tableName);
connection.tableOperations().attachIterator(tableName, new IteratorSetting(1, RowDeletingIterator.class));

// Write record with row key "row_id"
String row_id = "row_id";
Text colf = new Text("");
Text colq = new Text("data");
ColumnVisibility colv = new ColumnVisibility("");
BatchWriter writer = connection.createBatchWriter(tableName, new BatchWriterConfig()
            .setMaxMemory(memBuf)
            .setMaxLatency(timeout, TimeUnit.MILLISECONDS)
            .setMaxWriteThreads(numThreads));
Mutation mutation = new Mutation(row_id);
mutation.put(colf, colq, colv, System.nanoTime(), new Value("stuff".getBytes()));
writer.addMutation(mutation);
writer.close();

... //More work takes place

// Delete the record with row key "row_id"
BatchWriter batchWriter = connection.createBatchWriter(tableName, new BatchWriterConfig()
            .setMaxMemory(memBuf)
            .setMaxLatency(timeout, TimeUnit.MILLISECONDS)
            .setMaxWriteThreads(numThreads));
Mutation mutation = new Mutation(row_id);
mutation.put(new Text(), new Text(), new ColumnVisibility(), RowDeletingIterator.DELETE_ROW_VALUE);
batchWriter.addMutation(mutation);
batchWriter.close();

Answer 1

原来问题出System.nanoTime()在第一个插入的部分。通过删除它并使初始插入为：

mutation.put(colf, colq, colv, new Value("stuff".getBytes()));

RowDeletingIterator像它应该的那样工作。