java - 如何使用RowDeletingIterator

我正在尝试使用RowDeletingIterator删除Accumulo表中的条目，但是此后扫描表时，这些条目不会被删除。假设表row_id中有一个tableName条目，这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();

最佳答案

原来问题出在第一个插入的System.nanoTime()部分。通过删除并插入初始内容为:

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

RowDeletingIterator可以正常工作。