Scylla Delete Data Disk Space Not Release Problem

[860823346@qq.com]

The Scylla disk is full. Recently, the deletion operation was carried out. After deletion, the disk is not released. The deletion process is due to writing rowkey to the disk. On the contrary, the disk has been increased a lot. What can I do to release the disk?

[Glauber Costa]

data is really only deleted through a compaction.

Once the disk is full, though, you will not be able to run it.

The best procedure then is to add more nodes temporarily,  then execute nodetool cleanup in the old ones.

Once you are happy you can decommission the temporary nodes.

On Fri., Jul. 26, 2019, 5:59 a.m. , <8608...@qq.com> wrote:

The Scylla disk is full. Recently, the deletion operation was carried out. After deletion, the disk is not released. The deletion process is due to writing rowkey to the disk. On the contrary, the disk has been increased a lot. What can I do to release the disk?

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[860823346@qq.com]

Thank you very much, but I don't think this method seems very suitable for our scenario. Can we solve this problem without adding resources?

在 2019年7月26日星期五 UTC+8下午7:05:02，Glauber Costa写道：

data is really only deleted through a compaction.

Once the disk is full, though, you will not be able to run it.

The best procedure then is to add more nodes temporarily,  then execute nodetool cleanup in the old ones.

Once you are happy you can decommission the temporary nodes.

On Fri., Jul. 26, 2019, 5:59 a.m. , <8608...@qq.com> wrote:

The Scylla disk is full. Recently, the deletion operation was carried out. After deletion, the disk is not released. The deletion process is due to writing rowkey to the disk. On the contrary, the disk has been increased a lot. What can I do to release the disk?

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[860823346@qq.com]

Above is a part of our logs after we executed the cleanup command. There is basically no printed compressed content in the logs, and the disk space does not seem to be released. We did not add new nodes, but deleted some data. In this case, does the cleanup command not work very well?

在 2019年7月26日星期五 UTC+8下午7:05:02，Glauber Costa写道：

data is really only deleted through a compaction.

Once the disk is full, though, you will not be able to run it.

The best procedure then is to add more nodes temporarily,  then execute nodetool cleanup in the old ones.

Once you are happy you can decommission the temporary nodes.

On Fri., Jul. 26, 2019, 5:59 a.m. , <8608...@qq.com> wrote:

The Scylla disk is full. Recently, the deletion operation was carried out. After deletion, the disk is not released. The deletion process is due to writing rowkey to the disk. On the contrary, the disk has been increased a lot. What can I do to release the disk?

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[Glauber Costa]

On Fri, Jul 26, 2019 at 11:47 PM <8608...@qq.com> wrote:

Above is a part of our logs after we executed the cleanup command. There is basically no printed compressed content in the logs, and the disk space does not seem to be released. We did not add new nodes, but deleted some data. In this case, does the cleanup command not work very well?

Cleanup will not reduce your data size because it will not compact the data.

After a deletion, tombstones and data will be in different SSTables, and only a *compaction* will reduce it.

 

在 2019年7月26日星期五 UTC+8下午7:05:02，Glauber Costa写道：

data is really only deleted through a compaction.

Once the disk is full, though, you will not be able to run it.

The best procedure then is to add more nodes temporarily,  then execute nodetool cleanup in the old ones.

Once you are happy you can decommission the temporary nodes.

On Fri., Jul. 26, 2019, 5:59 a.m. , <8608...@qq.com> wrote:

The Scylla disk is full. Recently, the deletion operation was carried out. After deletion, the disk is not released. The deletion process is due to writing rowkey to the disk. On the contrary, the disk has been increased a lot. What can I do to release the disk?

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[860823346@qq.com]

Well, thank you very much.

在 2019年7月29日星期一 UTC+8下午9:40:51，Glauber Costa写道：

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[Glauber Costa]

You are welcome!

Let us know how it goes.

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