Question

我正在尝试使用来自cli的Cassandra CounterColumnFamily进行一些基本查询。我基本上有一个列系列'page_view_counts'，其中Row Key为url。每行有3个与之相关的计数（展示次数，转化次数和收入）。我已将其中一个计数编入索引，因为我想检索带转换的行＆gt; 10等。

这是描述page_view_counts的输出：

  ColumnFamily: page_view_counts
  Key Validation Class: org.apache.cassandra.db.marshal.UTF8Type
  Default column value validator: org.apache.cassandra.db.marshal.CounterColumnType
  Columns sorted by: org.apache.cassandra.db.marshal.UTF8Type
  GC grace seconds: 864000
  Compaction min/max thresholds: 4/32
  Read repair chance: 0.1
  DC Local Read repair chance: 0.0
  Replicate on write: true
  Caching: KEYS_ONLY
  Bloom Filter FP chance: default
  Column Metadata:
    Column Name: conversion
      Validation Class: org.apache.cassandra.db.marshal.CounterColumnType
      Index Name: page_view_counts_conversion_idx
      Index Type: KEYS
  Compaction Strategy: org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy
  Compression Options:
    sstable_compression: org.apache.cassandra.io.compress.SnappyCompressor

我的专栏系列中的一些示例数据：

RowKey: row27
=> (counter=conversion, value=27000)
=> (counter=impression, value=54000)
=> (counter=revenue, value=81000)
------------------- 
RowKey: row29
=> (counter=conversion, value=29000)
=> (counter=impression, value=58000)
=> (counter=revenue, value=87000)
------------------- 
RowKey: row81
=> (counter=conversion, value=81000)
=> (counter=impression, value=162000)
=> (counter=revenue, value=243000)

但是当我执行以下查询时，我收到了这些错误：

[default@hector] get page_view_counts where conversion>23;
invalid operation for commutative columnfamily page_view_counts
[default@hector] get page_view_counts where conversion=long('1000');
invalid operation for commutative columnfamily page_view_counts
[default@hector] get page_view_counts where conversion=1000;
invalid operation for commutative columnfamily page_view_counts
[default@hector] get page_view_counts where KEY='row81';
java.lang.NumberFormatException: An hex string representing bytes must have an even length
[default@hector] get page_view_counts where KEY=bytes('row81');
java.lang.RuntimeException: java.lang.RuntimeException: org.apache.cassandra.db.marshal.MarshalException: cannot parse 'row81' as hex bytes
[default@hector] get page_view_counts where KEY=utf8('row81');
invalid operation for commutative columnfamily page_view_counts

有人可以帮帮我吗？

感谢。

Answer 1

试试这个：

assume page_view_counts keys as UTF8Type;
get page_view_counts['row81'];

Cassandra查询错误：无效的操作和异常

1 个答案: