Solr needs a restart to recover from "No space left on device"

[John Davis <jo...@gmail.com>]

Hi there!

We ran out of disk on our solr instance. However even after cleaning up the
disk solr server did not realize that there is free disk available. It only
got fixed after a restart.

Is this a known issue? Or are there workarounds that don't require a
restart?

Thanks
John

Re: Solr needs a restart to recover from "No space left on device"

[Shawn Heisey <ap...@elyograg.org>]

On 2/6/2018 8:23 PM, John Davis wrote:
> We ran out of disk on our solr instance. However even after cleaning up the
> disk solr server did not realize that there is free disk available. It only
> got fixed after a restart.

If the files you deleted to free space were Solr indexes, then they were 
still held open by Solr.

Most operating systems other than Windows will let you delete files that 
are open, but the space for those files is not actually freed until they 
are closed, which may not happen until the program stops.  Restarting 
Solr would close those files, allowing the OS to free the space.

https://superuser.com/questions/738690/deleting-files-but-disk-space-is-still-full

Windows will refuse to let you delete files if they are open.

General disk requirement for any Lucene-based software (which includes 
Solr):  Make sure you have enough space available for your indexes to 
triple in size temporarily.  In most cases, the possible size increase 
will only be double, but there is a specific scenario that can lead to 
the index reaching triple size, so we always recommend triple.

Thanks,
Shawn