Shulou(Shulou.com)06/02 Report--

Redis cleans up the key of a prefix

For example, a research and development of online code, resulting in a certain prefix key dirty data (for example, the key prefix name is key_), we need to quickly clean up these problems key.

There are two common methods:

1. Dump produces a full amount of data, then finds out the key that meets the conditions, and deletes it [recommended]

2. Scan the redis with scan, fish out all the key, and then delete the qualified key

We use the first method here, as follows:

1. On the slave node, bgsave commands dump to output a full amount of data

Bgsave, the generated file name is similar to dump-6379.rdb

2. Install the rdb parsing tool

The next line of command pip install rdbtools python-lzf # python2.7 can complete the installation of rdb-c memory dump-6379.rdb > memory.csv # use this command to analyze rdb

3. Filter out the qualified key

Awk-F',''{print $3 $NF} 'memory.csv > keys.txt # filter out the name and expiration time of the key egrep key_ keys.txt > / root/key_.txt # filter out the key of the key_ prefix cat / root/key_.txt | sort-k 2-r > / root/sort_keys # sort the key in reverse order by date egrep 2019-09-10 / root/sort_keys > / root/match_keys # Note: I am here to deal with urgently Only 2019-09-10 expired key is filtered (this is the latest data and the most frequently visited key in business at present. Awk'{print $1}'/ root/match_keys > / root/filter_keys # redirects the final key to a file mkdir / root/test/split-2000 / root/filter_keys / root/test/ # splits the filter_keys into multiple files according to each 2k line for subsequent parallel processing

Then, let's write a script and batch process:

The vim / root/batch.sh content is as follows:

For i in `ls / root/test/ `; doecho "while read line;doecho\" del\ $line\ "| redis-cli-h 127.0.0.1-p 6379 done

/ root/run_$ {I} .shchmod + x / root/run_$ {I} .sh done

This generates a bunch of scripts.

Let's write a script and execute it in batch.

#! / bin/bashfor I in `ls run* .sh`; do nohup sh $I > / dev/null & done

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