卡桑德拉nodetool紧凑什么也没有发生

删除大量行的我没有以下步骤： 1）设置gc_grace_seconds = 0表 2）删除大量行的〜100万 3）Ran ./nodetool compact keyspace_name table_name

但是，当我运行nodetool compact（第3步）时，什么也没有发生。它不开始压缩。由于大量的墓碑，现在我的大部分请求都会超时。

该表具有以下设置：

AND bloom_filter_fp_chance = 0.001 
    AND caching = '{"keys":"ALL", "rows_per_partition":"NONE"}' 
    AND comment = '' 
    AND compaction = {'tombstone_threshold': '0.2', 'tombstone_compaction_interval': '86400', 'class': 'org.apache.cassandra.db.compaction.LeveledCompactionStrategy'} 
    AND compression = {'sstable_compression': 'org.apache.cassandra.io.compress.LZ4Compressor'} 
    AND dclocal_read_repair_chance = 0.1 
    AND default_time_to_live = 0 
    AND gc_grace_seconds = 0 
    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 = '99.0PERCENTILE';

我想压缩并摆脱墓碑，这样我可以真正摆脱不需要的数据。

我在我的群集中有复制因子2的两个节点由于我做了删除，两者之间的大小差异有所增加。大约有700MB的差异。我使用DSC-卡桑德拉-2.1.10

cfstats显示如下

Keyspace: keyspace1 
     Read Count: 16316 
     Read Latency: 12.23892982348615 ms. 
     Write Count: 11078808 
     Write Latency: 0.6955001765532899 ms. 
     Pending Flushes: 0 
       Table: table1 
       SSTable count: 92 
       SSTables in each level: [1, 4, 38, 49, 0, 0, 0, 0, 0] 
       Space used (live): 38247164244 
       Space used (total): 38247164244 
       Space used by snapshots (total): 26692664189 
       Off heap memory used (total): 14695952 
       SSTable Compression Ratio: 0.32499125289530584 
       Number of keys (estimate): 2788 
       Memtable cell count: 16632 
       Memtable data size: 1839846 
       Memtable off heap memory used: 0 
       Memtable switch count: 93 
       Local read count: 16316 
       Local read latency: 12.239 ms 
       Local write count: 11078808 
       Local write latency: 0.696 ms 
       Pending flushes: 0 
       Bloom filter false positives: 331 
       Bloom filter false ratio: 0.00000 
       Bloom filter space used: 10960 
       Bloom filter off heap memory used: 10224 
       Index summary off heap memory used: 3672 
       Compression metadata off heap memory used: 14682056 
       Compacted partition minimum bytes: 216 
       Compacted partition maximum bytes: 3449259151 
       Compacted partition mean bytes: 25823653 
       Average live cells per slice (last five minutes): 405.3014160485502 
       Maximum live cells per slice (last five minutes): 5002.0 
       Average tombstones per slice (last five minutes): 0.0 
       Maximum tombstones per slice (last five minutes): 0.0

来源

2017-01-17 GenerousJoker