error: read_beyond_eof when query couchdb

[biwugang]

Description

when query couchdb, the error occur:
{"error":"error","reason":"{badmatch,\n {'EXIT',\n {bad_return_value,\n {read_beyond_eof,\n "./data/shards/a0000000-bfffffff/local_whisks.1562291929.couch"}}}}"}

if the item which is not saved in such shard, the query is success.
it looks like the shard file is bad or corrupted

Steps to Reproduce

couchdb is used for our service,
couchdb will save some binary (the biggest size is about 50 MB)
current couchDB data size is 15GB,
it is hard to reproduce

Expected Behaviour

Your Environment

• CouchDB Version used: 2.1.2
• Browser name and version: I use curl command to do query
• Operating System and version: centos

Additional context

it looks like the shard file is bad,
how to fix such issue?

[shahkishak]

I'm facing this issue as well.
Couch log's size is growing wild over this one...
CouchLog_100819_185801.log

[wohali]

This is indeed a corrupt shard file. You need to restore from backup.

Please be aware that CouchDB does not support storing the .couch shard files on a NAS/SAN, especially over NFS. This can result in exactly the sort of corruption you're seeing.