如何使用RowDeletingIterator

Question

我试图用RowDeletingIterator删除我的Accumulo表中的条目，但是当我扫描表之后，这些条目没有被删除。假设表tableName中有一个row_id条目，下面是我要做的:

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

问题出在第一次插入的System.nanoTime()部分。通过删除它，让初始插入为:

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

RowDeletingIterator正常工作