Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

hide-storage-cache-related-content #1899

Merged
merged 1 commit into from
Feb 3, 2023
Merged

hide-storage-cache-related-content #1899

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
7 changes: 7 additions & 0 deletions docs-2.0/1.introduction/3.nebula-graph-architecture/4.storage-service.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -247,10 +247,17 @@ When a transfer leadership command is committed, the leader will abandon its lea

To avoid split-brain, when members in a Raft Group change, an intermediate state is required. In such a state, the quorum of the old group and new group always have an overlap. Thus it prevents the old or new group from making decisions unilaterally. To make it even simpler, in his doctoral thesis Diego Ongaro suggests adding or removing a peer once to ensure the overlap between the quorum of the new group and the old group. NebulaGraph also uses this approach, except that the way to add or remove a member is different. For details, please refer to addPeer/removePeer in the Raft Part class.

<!-- open after fully tested
{{ent.ent_begin}}

## Cache

The cache management of RocksDB can not cache vertices or edges on demand. NebulaGraph implements its own cache management for Storage, allowing you to set the storage cache size, content, etc. For more information, see [Storage cache configurations](../../5.configurations-and-logs/1.configurations/4.storage-config.md).

You can query the cache stats through the cURL command `curl "http://[storaged IP]:[http port]/cache?stats"`.

{{ent.ent_end}} -->

## Differences with HDFS

The Storage Service is a Raft-based distributed architecture, which has certain differences with that of HDFS. For example:
Expand Down
4 changes: 3 additions & 1 deletion docs-2.0/5.configurations-and-logs/1.configurations/4.storage-config.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -173,6 +173,8 @@ For more information, see [RocksDB official documentation](https://rocksdb.org/)

{{ ent.ent_begin }}

<!-- open after being fully tested

## Storage cache configurations

!!! enterpriseonly
Expand All @@ -189,7 +191,7 @@ For more information, see [RocksDB official documentation](https://rocksdb.org/)
| `vertex_item_ttl` | `300` | The TTL of vertex cache pool items. The configuration is measured in seconds. |
| `enable_negative_pool` | `false`| Whether to add a negative pool in cache. Only valid when `enable_storage_cache` is set to `true`. |
| `negative_pool_capacity` | `50` | The negative pool size in MB. |
| `negative_item_ttl` | `300` | The TTL in seconds for negative items in the cache. |
| `negative_item_ttl` | `300` | The TTL in seconds for negative items in the cache. | -->

## Black box configurations

Expand Down