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我正在使用 Cassandra 1.0.8 版本。来自 ruby​​-client 和 cassandra-cli 的删除请求总是给出超时异常。使用的列族的属性是

[default@sample_ks] show keyspaces;            
Keyspace: sample_ks:
  Replication Strategy: org.apache.cassandra.locator.SimpleStrategy
  Durable Writes: true
    Options: [replication_factor:1]
  Column Families:
    ColumnFamily: sample_cf
      Key Validation Class: org.apache.cassandra.db.marshal.AsciiType
      Default column value validator: org.apache.cassandra.db.marshal.UTF8Type
      Columns sorted by: org.apache.cassandra.db.marshal.LongType
      Row cache size / save period in seconds / keys to save : 0.0/0/all
      Row Cache Provider: org.apache.cassandra.cache.ConcurrentLinkedHashCacheProvider
      Key cache size / save period in seconds: 200000.0/14400
      GC grace seconds: 864000
      Compaction min/max thresholds: 4/32
      Read repair chance: 1.0
      Replicate on write: true
      Bloom Filter FP chance: default
      Built indexes: []
      Compaction Strategy: org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy

TimeOut 异常的原因是什么？他们怎么能避免..？？

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