一致性为LOCAL_ONE的读取查询期间，Cassandra失败（需要1个响应，但仅响应0个副本，其中1个失败）

问题描述

下面是我的脚本

CREATE TABLE alrashed.tbl_alerts_details (
    alert_id int,
    action_required int,
    alert_agent_id int,
    alert_agent_type_id int,
    alert_agent_type_name text,
    alert_definer_desc text,
    alert_definer_name text,
    alert_source text,
    alert_state text,
    col_1 text,
    col_2 text,
    col_3 text,
    col_4 text,
    col_5 text,
    current_escalation_level text,
    date_part date,
    device_id text,
    driver map<text, text>,
    is_processed int,
    is_real_time int,
    location map<text, text>,
    seq_no int,
    severity text,
    time_stamp timestamp,
    transporter map<text, text>,
    transporter_name text,
    trip_id int,
    updated_on timestamp,
    vehicle map<text, text>,
    vehicle_type_name text,
    PRIMARY KEY (alert_id)
    ) WITH read_repair_chance = 0.0
    AND dclocal_read_repair_chance = 0.1
    AND gc_grace_seconds = 864000
    AND 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 default_time_to_live = 0
    AND speculative_retry = '99PERCENTILE'
    AND min_index_interval = 128
    AND max_index_interval = 2048
    AND crc_check_chance = 1.0;  

在运行此查询时，我会得到

when I'm running this query I'm getting

这是我在Java中的Cassandra查询：

Here is my cassandra query in Java:

select
  count( * )
from
  tbl_alerts_details
where
  alert_state = 'ACKNOWLEDGE'
  and date_part >= '2017-10-01'
  and date_part <= '2017-10-31'
  and is_real_time = 1
  and alert_agent_type_name = 'VEHICLE' ALLOW FILTERING

推荐答案

此错误使我们意识到了空间问题，将图像存储在Base64的每一行中很快使墓碑问题出现。

This error had made us realise a space issue for us, storing images in Base64 in every row had quickly made the Tombstone problem arise.

根据此，

这篇关于一致性为LOCAL_ONE的读取查询期间，Cassandra失败（需要1个响应，但仅响应0个副本，其中1个失败）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！