检查 Couchbase 中文档的过期时间

Question

我们是运行 Couchbase Community Edition 4.5.1，最近完成了向 none 以前存在的文档添加 TTL 的过程。这样做之后，我们拉取了数据库的 csv 备份，发现大量文档仍然 return 过期为 0。我们不确定问题是更新失败，还是在数据拉。

不幸的是，Couchbase 存在一个问题，即 N1QL 的元数据中没有过期 return，因此我们无法独立确认任何给定文档的 csv 是否正确。

是否有其他方法可以通过控制台 UI 或 API 调用来获取文档的当前 TTL？

Answer 1

您可以使用 libcouchbase 中包含的 cbc 实用程序通过 --keystats 获取 TTL。例如：

$ cbc-stats --keystats -u Administrator -P - -U couchbase://localhost/travel-sample airline
_112
Bucket password: 
localhost:11210 key_is_dirty    false
localhost:11210 key_exptime 0
localhost:11210 key_flags   33554432 (cbc: converted via htonl)
localhost:11210 key_cas 1503621971151421440
localhost:11210 key_vb_state    active

并注意 Couchbase Server 5.0, the Sub-Document API has been enhanced so you can fetch the TTL as a virtual XATTR。例如：

$ cbc-subdoc -u Administrator -P - -U couchbase://localhost/travel-sample
Bucket password: 
subdoc> get -x $document airline_112
airline_112          CAS=0x14ddf0375af40000
0. Size=188, RC=0x00 Success (Not an error)
{"CAS":"0x14ddf0375af40000","vbucket_uuid":"0x0000e976b253ad5c","seqno":"0x0000000000000001","exptime":0,"value_bytes":118,"datatype":["json"],"deleted":false,"last_modified":"1503621971"}
1. Size=118, RC=0x00 Success (Not an error)
{"callsign":"FLYSTAR","country":"United Kingdom","iata":"5W","icao":"AEU","id":112,"name":"Astraeus","type":"airline"}
subdoc> get -x $document.exptime airline_112
airline_112          CAS=0x14ddf0375af40000
0. Size=1, RC=0x00 Success (Not an error)
0
1. Size=118, RC=0x00 Success (Not an error)
{"callsign":"FLYSTAR","country":"United Kingdom","iata":"5W","icao":"AEU","id":112,"name":"Astraeus","type":"airline"}
subdoc> get -x $document.exptime -x $document.value_bytes airline_112
airline_112          CAS=0x14ddf0375af40000
0. Size=1, RC=0x00 Success (Not an error)
0
1. Size=3, RC=0x00 Success (Not an error)
118
2. Size=118, RC=0x00 Success (Not an error)
{"callsign":"FLYSTAR","country":"United Kingdom","iata":"5W","icao":"AEU","id":112,"name":"Astraeus","type":"airline"}

您也可以从 SDK 中以编程方式获取这些 XATTR，这可能对单元测试很方便。 Documentation of these features is available.

检查 Couchbase 中文档的过期时间

Checking Expiration of Document in Couchbase

couchbase