如何在Aerospike中修改ttl为-1的所有记录集的TTL? [英] How to modify the TTL of all records set with a ttl of -1 in aerospike?

问题描述

我想修改所有意外设置为永不过期" TTL(客户端为-1)的记录的TTL.我该怎么办?

解决方案

只需澄清一下，设置 default-ttl 为0 /operations/configure"rel =" nofollow noreferrer> aerospike.conf 文件)，而在客户端中将TTL设置为0意味着继承此命名空间的默认ttl .

具有谓词过滤功能:

如果您使用的是 Java ， C ， AQL 注册Lua模块:

$ aql
Aerospike Query Client
Version 3.12.0
C Client Version 4.1.4
Copyright 2012-2017 Aerospike. All rights reserved.
aql> register module './ttl.lua'
OK, 1 module added.

然后在Java应用程序中:

Statement stmt = new Statement();
stmt.setNamespace(params.namespace);
stmt.setSetName(params.set);
stmt.setPredExp(
  PredExp.recVoidTime(),
  PredExp.integerValue(0),
  PredExp.integerEqual()
  );

ExecuteTask task = client.execute(params.writePolicy, stmt, "ttl", "set_ttl", Value.IntegerValue(604800));
task.waitTillComplete();

仅使用UDF :

对于尚未进行谓词过滤的其他客户端(Python，PHP等)，您将通过应用于扫描的记录UDF来完成所有操作.过滤逻辑必须存在于UDF中.

ttl.lua

function modify_zero_ttl(rec, to_ttl)
  local rec_ttl = record.ttl(rec)
  if rec_ttl == 0 then
    record.set_ttl(rec, to_ttl)
    aerospike:update(rec)
  end
end

在 AQL :

$ aql
Aerospike Query Client
Version 3.12.0
C Client Version 4.1.4
Copyright 2012-2017 Aerospike. All rights reserved.
aql> register module './ttl.lua'
OK, 1 module added.

aql> execute ttl.modify_zero_ttl(604800) on test.foo

I want to modify the TTL of all the records that were accidentally set with a 'never expire' TTL (-1 in the client). How would I do that?

解决方案

Just to clarify, setting a TTL of -1 in the client means never expire (equivalent to a default-ttl of 0 in the server's aerospike.conf file), while setting a TTL of 0 in the client means inherit the default-ttl for this namespace.

With Predicate Filtering:

If you're using the Java, C, C# and Go clients the easiest way to identify the records with a void time of 0 would be to use a predicate filter. You would apply a simple record UDF to all the records matched by the predicate filter.

ttl.lua

function set_ttl(rec, to_ttl)
  record.set_ttl(rec, to_ttl)
  aerospike:update(rec)
end

Register the Lua module using AQL:

$ aql
Aerospike Query Client
Version 3.12.0
C Client Version 4.1.4
Copyright 2012-2017 Aerospike. All rights reserved.
aql> register module './ttl.lua'
OK, 1 module added.

Then in the Java app:

Statement stmt = new Statement();
stmt.setNamespace(params.namespace);
stmt.setSetName(params.set);
stmt.setPredExp(
  PredExp.recVoidTime(),
  PredExp.integerValue(0),
  PredExp.integerEqual()
  );

ExecuteTask task = client.execute(params.writePolicy, stmt, "ttl", "set_ttl", Value.IntegerValue(604800));
task.waitTillComplete();

Only using UDFs:

With other clients that don't yet have predicate filtering (Python, PHP, etc), you would do it all through a record UDF that's applied to a scan. The filtering logic would have to live inside the UDF.

ttl.lua

function modify_zero_ttl(rec, to_ttl)
  local rec_ttl = record.ttl(rec)
  if rec_ttl == 0 then
    record.set_ttl(rec, to_ttl)
    aerospike:update(rec)
  end
end

In AQL:

$ aql
Aerospike Query Client
Version 3.12.0
C Client Version 4.1.4
Copyright 2012-2017 Aerospike. All rights reserved.
aql> register module './ttl.lua'
OK, 1 module added.

aql> execute ttl.modify_zero_ttl(604800) on test.foo

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