我在cassandra中有一个列族，其模式如下。

CREATE TABLE app_documents (
    key text PRIMARY KEY,
    created_at timestamp,
    created_by text,
    details text,
    id text
) WITH bloom_filter_fp_chance = 0.01
    AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
    AND comment = ''
    AND compaction = {'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy', 'max_threshold': '32', 'min_threshold': '4'}
    AND compression = {'chunk_length_in_kb': '64', 'class': 'org.apache.cassandra.io.compress.LZ4Compressor'}
    AND crc_check_chance = 1.0
    AND dclocal_read_repair_chance = 0.1
    AND default_time_to_live = 0
    AND gc_grace_seconds = 864000
    AND max_index_interval = 2048
    AND memtable_flush_period_in_ms = 0
    AND min_index_interval = 128
    AND read_repair_chance = 0.0
    AND speculative_retry = '99PERCENTILE';
CREATE INDEX app_documents_id_idx ON app_documents (id);

在这个cf中，我有一个键为''的记录，我可以使用查询选择该记录

select * from app_documents WHERE key = 'abc';

现在我正试图用下面的查询删除或更新它。

delete from app_documents WHERE key = 'abc';
update app_documents set created_by = 'pd' where key = 'abc';

但上述命令对记录没有影响。表中的其他记录按预期工作，但只有此记录处于这种状态。
我的cassandra设置只是一个节点。