Large memory usage downloading attachements
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Key: COUCHDB-964
URL: https://issues.apache.org/jira/browse/COUCHDB-964
Project: CouchDB
Issue Type: Bug
Components: HTTP Interface
Affects Versions: 1.0.1
Environment: Linux, Erlang R14B
Reporter: David Orrell
When downloading a large attachment the CouchDB process appears to load the
entire attachment in memory before data is sent to the client. I have a 1.5 GB
attachment and the CouchDB process grows by approximately this amount per
client connection.
For example (as reported by Bram Nejit):
dd if=/dev/urandom of=/tmp/test.bin count=50000 bs=10240
Put test.bin as an attachment in a coucdb database
Run
for i in {0..50};do curl http://localhost:5984/[test
database]/[doc_id]/test.bin > /dev/null 2>&1 & done
This will create 50 curl processes which download from your couchdb. Looking at
the memory consumption of couchdb, it seems like it is loading large parts of
the file into memory.
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