cassandra-cli：无法将“allias”强制转换为版本 1 UUID答案

【问题标题】：cassandra-cli: unable to coerce 'allias' to version 1 UUIDcassandra-cli：无法将“allias”强制转换为版本 1 UUID
【发布时间】：2011-09-19 21:18:23
【问题描述】：

我正在尝试创建一个以 TimeUUIDType 作为行名的列族：

create column family users
with column_type = 'Standard'
and comparator = 'TimeUUIDType'
and default_validation_class = 'UTF8Type'
and key_validation_class = 'UTF8Type'
and memtable_operations = 0.290625
and memtable_throughput = 62
and memtable_flush_after = 1440
and rows_cached = 0.0
and row_cache_save_period = 0
and keys_cached = 200000.0
and key_cache_save_period = 14400
and read_repair_chance = 1.0
and gc_grace = 864000
and min_compaction_threshold = 4
and max_compaction_threshold = 32
and replicate_on_write = true
and row_cache_provider = 'ConcurrentLinkedHashCacheProvider'
and column_metadata=[
{column_name: allias, validation_class: UTF8Type, index_type: KEYS, index_name: allias},
{column_name: st_user_id, validation_class: TimeUUIDType, index_type: KEYS, index_name: st_user_id},
{column_name: st_money, validation_class: IntegerType},
{column_name: mail, validation_class: UTF8Type},
{column_name: password, validation_class: UTF8Type},
{column_name: last_visit, validation_class: DateType},
{column_name: registered, validation_class: DateType}
];

但是我遇到了一个异常：

org.apache.cassandra.db.marshal.MarshalException: 无法强制版本 1 UUID 的“别名”

我做错了什么？

【问题讨论】：

标签： exception cassandra uuid coerce

【解决方案1】：

列族的比较器属性用于对一行中的列进行排序。您正在尝试使用 TimeUUID 比较器，这将要求每个列名都是 TimeUUID 值。

如果您想使用 TimeUUIDs 作为您的行键，但您可能只想切换这些设置的值，但列名的字符串，

comparator = 'UTF8Type',
key_validation_class = 'TimeUUIDType'

【讨论】：