[COUCHDB-602] Cannot use NFS for storage

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: 0.10
• Component/s: Test Suite
• Skill Level: Committers Level (Medium to Hard)
• Assignee: Unassigned
• Reporter: Nils Breunese
• Created: 16/Dec/09 15:50
• Updated: 11/Apr/12 18:34
• Resolved: 11/Apr/12 18:34

Description

Our hosting provider claims they cannot upgrade our CouchDB installation from version 0.9.1 to 0.10 as the test suite for 0.10 is failing.

This is a translation from their report:

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CouchDB can't handle having its data directory on NFS.

It seems CouchDB tries to do this:
1 mkdir test
2 start process X with fd under test/foo
3 do the work
4 rm test/foo
5 rmdir test
6 kill process X

When test/ is on NFS:
In step 4 an open file is being removed. NFS doesn't really support this
and the workaround is that the client implementation does
mv file .nfsXXXXXXX

However, the 'rmdir test' in step 5 then cannot succeed anymore, since
the directory is not empty. This eventually causes CouchDB to crash.

In earlier versions of CouchDB the open/rm/rmdir/kill order may have
been different, for instance open/rm/kill/rmdir.

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