Warning: Steem witnesses executed a hard fork on 2020-05-20, seizing 23.6M STEEM from 65 accounts. The funds were transferred to an account named @community321, the ownership (and intentions) of which have not been revealed. The witnesses claim to have been targeting accounts which defended against a hostile takeover in early March, but at least 2 accounts on the list have been inactive for over 4 years.

Coverage:
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lz4压缩是真的香 by ety001

View this thread on steempeak.com
· @ety001 · (edited)
$4.47
lz4压缩是真的香
最近在看官方库的[Dockerfile相关的脚本](https://github.com/steemit/steem/tree/master/contrib),学习到了一些有价值的点。

比如在区块数据备份这块,我发现官方使用的 `lz4` 压缩工具。

去查了下,发现 `lz4` 是目前综合来看效率最高的压缩算法,更加侧重压缩解压速度,压缩比并不是第一。在当前的安卓和苹果操作系统中,内存压缩技术就使用的是 `lz4` 算法,及时压缩手机内存以带来更多的内存空间。本质上是时间换空间。

压缩效率高,对于像 `steem` 这样的庞大的数据怪物的备份来说,太重要了。

使用起来也很方便,系统应该都是默认安装了 `lz4` 的。

在目的目录执行下面的命令:

```
tar  -cf  steem_blockchain.tar.lz4  --use-compress-program=lz4   -C  /data2/steem/data/witness_node_data_dir   blockchain/
```

就可以把 `/data2/steem/data/witness_node_data_dir` 下面的 `blockchain` 文件夹打包并使用 `lz4` 压缩。

经过测试,源目录 `blockchain` 的大小是 `374G`,压缩后的文件是 `261G`,压缩比还可以。

最重要的是时间。往常在我的服务器上使用 `gzip` 和 `tar` 打包备份,一般就是大半天的时间。而这次使用 `lz4` 压缩才用了大约两个小时,太惊艳了!

接下来,要把目前所有的备份都换成使用 `lz4` 进行压缩打包。

---
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---

**感谢你的阅读,我是中文区见证人之一,欢迎通过 [SteemConnect](https://v2.steemconnect.com/sign/account-witness-vote?witness=ety001&approve=1) 来给我投票,或者打开 [https://steemitwallet.com/~witnesses](https://steemitwallet.com/~witnesses) 页面,输入 *ety001* 进行投票。**

![2.gif](https://steemitimages.com/DQmZfJo3F8NXpFx7nenQA3zTU9jg6YoRQvfyeeHgSYpdqr4/2.gif)

**中文区的见证人目前有:**
支持一下他们(按字母顺序),*一人可以有30票*:
- @cn-witnesses| [投票](https://steemconnect.com/sign/account_witness_vote?approve=1&witness=cn-witnesses)
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---

**Thank you for reading.  I'm a witness. I would really appreciate your witness vote! You can vote by [SteemConnect](https://v2.steemconnect.com/sign/account-witness-vote?witness=ety001&approve=1). Or open [https://steemitwallet.com/~witnesses](https://steemitwallet.com/~witnesses) page, input *ety001* to vote.**

![2.gif](https://steemitimages.com/DQmZfJo3F8NXpFx7nenQA3zTU9jg6YoRQvfyeeHgSYpdqr4/2.gif)
👍  , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , and 22 others
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@cheetah ·
Hi! Did you know that steemit.com is now censoring users and posts based on their opinions?
 All the posts of these users are gone!
https://github.com/steemit/condenser/commit/3394af78127bdd8d037c2d49983b7b9491397296 

 Here's a list of some banned users:
```'roelandp', 'blocktrades', 'anyx', 'ausbitbank', 'gtg', 'themarkymark', 'lukestokes.mhth', 'netuoso', 'innerhive'```
See anyone you recognize? There could be more, they also have a remote IP ban list.

Will you be censored next?
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