Question

我是Cassandra的新手，我在尝试删除记录方面遇到了一些问题。我有一个表定义如下：

CREATE TABLE wire_journal (
    persistence_id text,
    partition_nr bigint,
    sequence_nr bigint,
    timestamp timeuuid,
    timebucket text,
    event blob,
    event_manifest text,
    message blob,
    ser_id int,
    ser_manifest text,
    tag1 text,
    tag2 text,
    tag3 text,
    used boolean static,
    writer_uuid text,
    PRIMARY KEY ((persistence_id, partition_nr), sequence_nr, timestamp, timebucket)
) WITH CLUSTERING ORDER BY (sequence_nr ASC, timestamp ASC, timebucket ASC)
    AND bloom_filter_fp_chance = 0.01
    AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
    AND comment = ''
    AND compaction = {'bucket_high': '1.5', 'bucket_low': '0.5', 'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy', 'enabled': 'true', 'max_threshold': '32', 'min_sstable_size': '50', 'min_threshold': '4', 'tombstone_compaction_interval': '86400', 'tombstone_threshold': '0.2', 'unchecked_tombstone_compaction': 'false'}
    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';

索引定义如下：

CREATE CUSTOM INDEX timestamp_idx ON wire_journal (timestamp) USING 'org.apache.cassandra.index.sasi.SASIIndex';
CREATE CUSTOM INDEX manifest_idx ON wire_journal (event_manifest) USING 'org.apache.cassandra.index.sasi.SASIIndex';

我希望能够通过timestamp和event_manifest删除。

我可以通过事件清单进行查询，例如：

select event_manifest, dateOf(timestamp) from wire_journal where event_manifest = '011000028';

上面的查询有效。但是，如果我尝试删除以下相同的标准：

delete from wire_journal where event_manifest = '011000028';

我收到以下错误：

InvalidRequest：code = 2200 [无效查询] message =“缺少某些分区关键部分：persistence_id，partition_nr”

我已尝试在删除中包含这些列，如下所示：

delete persistence_id, partition_nr from wire_journal where event_manifest = 'aba:011000028';

我收到以下错误：

invalidRequest：code = 2200 [无效查询] message =“用于删除的标识符persistence_id无效（不应该是PRIMARY KEY部分）”

如何删除符合该条件的所有记录？

Answer 1

您的分区键是（persistence_id，partition_nr），而Cassandra只使用分区键删除记录

所以你的查询需要像：

delete from wire_journal where persistence_id = x AND partition_nr = y AND event_manifest = 'aba:011000028';

卡桑德拉删除记录

1 个答案: