Couchbase 5.x压缩磁盘空间要求：针对Bucket还是单个vBucket？

Great question! Let me break this down clearly based on Couchbase 5.x's compaction behavior (aligning with the older documentation rule you referenced):

The disk space check for compaction (requiring available space to be at least twice the current database size) applies to the entire Bucket (or more precisely, the portion of the Bucket residing on the individual node being checked), not a single vBucket being compacted at any given time. Here's the breakdown:

• Couchbase schedules and monitors compaction at the Bucket level. Even though compaction processes vBuckets one by one under the hood, the initial validation of disk space eligibility is calculated against the total size of the Bucket's data stored on that specific node.
• If your Bucket is distributed across multiple nodes, each node will independently check if its local available disk space is at least twice the size of the Bucket's shards (vBuckets) hosted on it. It doesn't look at the total size of the entire Bucket across the entire cluster.
• The warning logs generated when space is insufficient will reference the Bucket name and the node's disk status, not an individual vBucket, which further confirms this scope.

内容的提问来源于stack exchange，提问作者user976850