答复: sstabledump and liveness_info question

[Xiangfei Ni <xi...@cm-dt.com>]

Hi
  Anyone can help on this would be highly appreciated.

Best Regards,

倪项菲/ David Ni
中移德电网络科技有限公司
Virtue Intelligent Network Ltd, co.
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发件人: Xiangfei Ni
发送时间: 2018年6月8日 13:37
收件人: user <us...@cassandra.apache.org>
主题: sstabledump and liveness_info question

Hi Expert,
  I have questions about sstabledump
  1,create table and insert data:
    create table test2(a text,b text,primary key (a));
    insert into test2(a,b) values ('a','b');
  2,flush data to disk
  3,sstabledump the sstable
    [cassandra@concar-cassandra01] /opt/database/apache-cassandra-data/stresscql/test2-a9d1a1306adb11e8a14077a1580c0a40 $ /opt/database/apache-cassandra/tools/bin/sstabledump ./mc-1-big-Data.db
[
  {
    "partition" : {
      "key" : [ "a" ],
      "position" : 0
    },
    "rows" : [
      {
        "type" : "row",
        "position" : 15,
        "liveness_info" : { "tstamp" : "2018-06-08T05:20:39.932553Z" },
        "cells" : [
          { "name" : "b", "value" : "b" }
        ]
      }
    ]
  }
  4,update data:
    update test2 set b='2' where a='a';
  5,flush data to disk
  6,sstabledump the sstable
    [cassandra@concar-cassandra01] /opt/database/apache-cassandra-data/stresscql/test2-a9d1a1306adb11e8a14077a1580c0a40 $ /opt/database/apache-cassandra/tools/bin/sstabledump ./mc-2-big-Data.db
[
  {
    "partition" : {
      "key" : [ "a" ],
      "position" : 0
    },
    "rows" : [
      {
        "type" : "row",
        "position" : 15,
        "cells" : [
          { "name" : "b", "value" : "2", "tstamp" : "2018-06-08T05:22:17.959558Z" }
        ]
      }
    ]
  }
]

My questions are:
1,why there is no liveness_info element in the second sstable dump?
2,why the output format is not the same?The second dump has the "tstamp" : "2018-06-08T05:22:17.959558Z" in the cell element but there is no in the first output?
3,is there detail instruction about sstableoutput?