wal dir is not used in meta server

[wenzhenghu]

according to rocksdb log, wal and data is in the same dir.

2019/09/04-16:42:02.391629 7f8353d37b40 SST files in data/meta/nebula/0/data dir, Total Num: 0, files: 
2019/09/04-16:42:02.391631 7f8353d37b40 Write Ahead Log file in data/meta/nebula/0/data: 
...
2019/09/04-16:42:02.391655 7f8353d37b40                                 Options.wal_dir: data/meta/nebula/0/data

by there still have a wal dir . maybe the setting is wrong, wal should move to wal dir.

[root@nebula2 0]# ls
data  wal
[root@nebula2 0]# pwd
/usr/local/nebula/data/meta/nebula/0
[root@nebula2 0]# ls wal/
0
[root@nebula2 0]# ls wal/0/
[root@nebula2 0]# 

[critical27]

Just as you said, wal and data is in the same dir (see NebulaStore::newPart). We may clean outdated wal in background. Default wal_ttl is 86400s.

[wenzhenghu]

@critical27 did you mean that outdated wal will first move to data/meta/nebula/0/wal ？

[zhangguoqing]

In fact, when metad is a cluster, the wal will be used. :)