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etcdctlv3: Add option to defrag a data directory directly, for cases where etcd is not running.

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This commit is contained in:
Joe Betz
2017-08-03 21:19:04 -07:00
parent a9b9ef5640
commit 39432ac31f
3 changed files with 63 additions and 5 deletions
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22
etcdctl/README.md
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@@ -734,11 +734,16 @@ If NOSPACE alarm is present:
# alarm:NOSPACE
```
### DEFRAG
### DEFRAG [options]
DEFRAG defragments the backend database file for a set of given endpoints. When an etcd member reclaims storage space
from deleted and compacted keys, the space is kept in a free list and the database file remains the same size. By defragmenting
the database, the etcd member releases this free space back to the file system.
DEFRAG defragments the backend database file for a set of given endpoints while etcd is running, or directly defragments an
etcd data directory while etcd is not running. When an etcd member reclaims storage space from deleted and compacted keys, the
space is kept in a free list and the database file remains the same size. By defragmenting the database, the etcd member
releases this free space back to the file system.
#### Options
- data-dir -- Optional. If present, defragments a data directory not in use by etcd.
#### Output
@@ -752,6 +757,15 @@ For each endpoints, prints a message indicating whether the endpoint was success
# Failed to defragment etcd member[badendpoint:2379] (grpc: timed out trying to connect)
```
To defragment a data directory directly, use the `--data-dir` flag:
``` bash
# Defragment while etcd is not running
./etcdctl defrag --data-dir default.etcd
# success (exit status 0)
# Error: cannot open database at default.etcd/member/snap/db
```
#### Remarks
DEFRAG returns a zero exit code only if it succeeded defragmenting all given endpoints.