如何降级Cassandra 3.0.0 - > 2.x？ [英] How to downgrade Cassandra 3.0.0 -> 2.x?

问题描述

I recently found out that Cassandra 3.0.0 and PrestoDB don't play well together.

我有很多数据加载到Cassandra 3.0和我的应用程序中。我最近发现Cassandra 3.0.0和PrestoDB不能一起播放。不想重建整个事情。有一个安全的方法降级到2.x暂时，直到Presto更新，那么我可以回到3.0？

I have a lot of data loaded into Cassandra 3.0 and I wouldn't like to rebuild the whole thing. Is there a safe way to downgrade to 2.x temporarily until Presto is updated, so then I can come back to 3.0?

我知道降级是官方支持，但是，我想知道是否更有经验的SO Cassandra用户可以在这里指向正确的方向。我认为答案将是不要尝试，但谁知道，也许有一种方式。提前感谢。

I know downgrading is not officially supported, but I'm wondering whether more experienced S.O. Cassandra users could point me in the right direction here. I assume the answer will be "don't try it", but who knows, maybe there's a way. Thanks in advance.

更新2016-11-05 ：使用PrestoDB的0.147及更高版本，此问题已解决。最后，我不需要降级Cassandra，以使用PrestoDB。感谢您的回覆。

Update 2016-11-05 : Using version 0.147 and newer of PrestoDB and this issue has been solved. In the end I did not need to downgrade Cassandra in order to use PrestoDB. Thanks for your replies.

推荐答案

如果您开始使用3.0，我唯一能想到的是导出所有数据然后重新导入。存储格式已大幅更改，2.x无法读取3.0表。

If you've started with 3.0, the only way I can think of is to export all your data then reimport it. The storage format has massively changed and 2.x can't read the 3.0 tables.

不幸的是，sstable2json在3.0版本中已删除，因此您可能需要手动导出，然后导入到以前的版本。

Unfortunately sstable2json was removed in 3.0, so you'll probably need to export it all manually then import into a previous version.

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