Question

这是模型，使用cassandra 2.0，cql 3，只有一个节点：

CREATE TABLE purchase (
  row_id timeuuid,
  date text,
  domain_id text,
  item_id text,
  product_id text,
  purchase_id text,
  stream_id text,
  PRIMARY KEY (row_id)
) WITH
  bloom_filter_fp_chance=0.010000 AND
  caching='KEYS_ONLY' AND
  comment='' AND
  dclocal_read_repair_chance=0.000000 AND
  gc_grace_seconds=864000 AND
  index_interval=128 AND
  read_repair_chance=0.100000 AND
  replicate_on_write='true' AND
  populate_io_cache_on_flush='false' AND
  default_time_to_live=0 AND
  speculative_retry='99.0PERCENTILE' AND
  memtable_flush_period_in_ms=0 AND
  compaction={'class': 'SizeTieredCompactionStrategy'} AND
  compression={'sstable_compression': 'LZ4Compressor'};

CREATE INDEX purchase_date ON purchase (date);

CREATE INDEX purchase_domain ON purchase (domain_id);

domain_id的所有值都是相同的，因此在查询此字段时应该没有问题。但我有这个：

cqlsh:mykeyspace> select count(*) from purchase limit 1000000;

 count
--------
 114292

所以这不是一张沉重的桌子，但是：

cqlsh:mykeyspace> select * from purchase where domain_id = 'test' limit 5;

 row_id                               | date       | domain_id | item_id   | product_id | purchase_id | stream_id
--------------------------------------+------------+-----------+-----------+------------+-------------+-----------
 090006e0-788f-11e3-a0c1-6142bbb646b5 | 2014-01-01 |     test | 254386500 |   6567576457 |   7654546343 |  purchase
 eb6300b0-788e-11e3-a0c1-6142bbb646b5 | 2014-01-01 |     test | 254386500 |   6567576457 |   7654546343 |  purchase
 fc268980-788e-11e3-a0c1-6142bbb646b5 | 2014-01-01 |     test | 254386500 |   6567576457 |   7654546343 |  purchase
 1fdefe40-7888-11e3-a0c1-6142bbb646b5 | 2014-01-01 |     test | 254386500 |   6567576457 |   7654546343 |  purchase
 f7cc3010-788e-11e3-a0c1-6142bbb646b5 | 2014-01-01 |     test | 254386500 |   6567576457 |   7654546343 |  purchase

 cqlsh:mykeyspace> select count(*) from purchase where domain_id = 'test' limit 1000;

 count
-------
  1000

cqlsh:mykeyspace> select count(*) from purchase where domain_id = 'test' limit 10000;
Request did not complete within rpc_timeout.

似乎模型是正确的，所以我想知道我做错了什么。

Answer 1

您是否尝试过重建索引并在使用rebuild_index nodetool命令完成后再次尝试？

rpc_timeout用于对cassandra进行简单查询，使用索引

1 个答案: