Question

Cassandra对表的写入速度很慢（每次插入的写入延迟为38ms）。我试图通过转向跟踪来找出原因。但是我得到了这个错误，我不明白。请注意，插入本身确实成功。我正在使用cassandra 1.2.5

错误：'NoneType'对象不可迭代

这是插入内容：

insert into table1(col1, col2, col3,
                   col15, col6, col11,
                   col12, col13, col14,
                   col7,col8, col10,
                   col9, col4, col5)
            values (6000000, 1, 'name_1', 'name_alias_1',
                    false,false, 676, 59455,
                    'REG', 'ADM', 'CRT', 'AST', 
                    {'1000000001', '1000000002', '1000000003', '1000000004'}, 
                    '2013-06-26 19:44:36', '2013-06-26 19:44:36');

这是表desc：

CREATE TABLE table1 (
  col1 bigint,
  col2 bigint,
  col3 text,
  col4 timestamp,
  col5 timestamp,
  col6 boolean,
  col7 text,
  col8 text,
  col9 set<text>,
  col10 text,
  col11 boolean,
  col12 bigint,
  col13 int,
  col14 text,
  col15 text
  PRIMARY KEY (col1, col2)
) 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
  read_repair_chance=0.100000 AND
  replicate_on_write='true' AND
  populate_io_cache_on_flush='false' AND
  compaction={'class': 'SizeTieredCompactionStrategy'} AND
  compression={'sstable_compression': 'SnappyCompressor'};

Answer 1

这是1.2.6之前的跟踪（https://issues.apache.org/jira/browse/CASSANDRA-5668）中的错误。唯一的解决方法是升级。

跟踪错误“对象不可迭代”

1 个答案: