cassandra 3.0 中的 cassandra-cli 'list'

Question

我想查看 "rowkey" 及其在 cassandra 3.0 中存储的数据。我知道，折旧的 cassandra-cli 有 'list'-command。但是，在 cassandra 3.0 中，我找不到 'list'-command 的替代品。有人知道 'list' 的新 cli 命令吗？

Answer 1

您可以按照@chris-lohfink 的建议使用sstabledump 实用程序。如何使用它？创建键空间，table 在其中填充一些数据：

cqlsh> CREATE KEYSPACE IF NOT EXISTS minetest WITH REPLICATION = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 };

cqlsh> CREATE TABLE object_coordinates (
   ... object_id int PRIMARY KEY,
   ... coordinate text
   ... );

cqlsh> use minetest;

cqlsh:minetest> insert into object_coordinates (object_id, coordinate) values (564682,'59.8505,34.0035');
cqlsh:minetest> insert into object_coordinates (object_id, coordinate) values (1235,'61.7814,40.3316');
cqlsh:minetest> select object_id, coordinate, writetime(coordinate) from object_coordinates;

 object_id | coordinate      | writetime(coordinate)
-----------+-----------------+-----------------------
      1235 | 61.7814,40.3316 |      1480436931275615
    564682 | 59.8505,34.0035 |      1480436927707627

(2 rows)

object_id 是主（分区键）键，coordinate 是集群键。

将更改刷新到磁盘：

# nodetool flush

在磁盘上找到sstable并分析：

# cd /var/lib/cassandra/data/minetest/object_coordinates-e19d4c40b65011e68563f1a7ec2d3d77

# ls
backups  mc-1-big-CompressionInfo.db  mc-1-big-Data.db  mc-1-big-Digest.crc32  mc-1-big-Filter.db  mc-1-big-Index.db  mc-1-big-Statistics.db  mc-1-big-Summary.db  mc-1-big-TOC.txt

# sstabledump mc-1-big-Data.db
[
  {
    "partition" : {
      "key" : [ "1235" ],
      "position" : 0
    },
    "rows" : [
      {
        "type" : "row",
        "position" : 18,
        "liveness_info" : { "tstamp" : "2016-11-29T16:28:51.275615Z" },
        "cells" : [
          { "name" : "coordinate", "value" : "61.7814,40.3316" }
        ]
      }
    ]
  },
  {
    "partition" : {
      "key" : [ "564682" ],
      "position" : 43
    },
    "rows" : [
      {
        "type" : "row",
        "position" : 61,
        "liveness_info" : { "tstamp" : "2016-11-29T16:28:47.707627Z" },
        "cells" : [
          { "name" : "coordinate", "value" : "59.8505,34.0035" }
        ]
      }
    ]
  }
]

或使用 -d 标志：

# sstabledump mc-1-big-Data.db -d
[1235]@0 Row[info=[ts=1480436931275615] ]:  | [coordinate=61.7814,40.3316 ts=1480436931275615]
[564682]@43 Row[info=[ts=1480436927707627] ]:  | [coordinate=59.8505,34.0035 ts=1480436927707627

输出显示 1235 和 564682 并在这些分区中保存坐标。

Link 到文档 http://www.datastax.com/dev/blog/debugging-sstables-in-3-0-with-sstabledump

PS。 sstabledump 由 ubuntu 中的 cassandra-tools 包提供。

cassandra 3.0 中的 cassandra-cli 'list'

cassandra-cli 'list' in cassandra 3.0

cassandra

cassandra-cli