Mongoexport with cluster throws i/o timeout error

Question

Just upgraded to mongo 3.0, but mongoexport gives us a the following error: "Failed: read tcp 127.0.0.1:27020: i/o timeout" after outputting some documents (not always the same amount). mongoexport is connecting to a sharded cluster of 4 standalone mongod servers with 3 mongod config servers

[root@SRV]$ mongoexport --host localhost:27022,localhost:27021,localhost:27020 --db horus --collection users --type json --fields _id | wc -l

2015-03-09T12:41:19.198-0600 connected to: localhost:27022,localhost:27021,localhost:27020

2015-03-09T12:41:22.570-0600 Failed: read tcp 127.0.0.1:27020: i/o timeout

15322

The versions we are using are:

[root@MONGODB01-SRV]# mongo --version MongoDB shell version: 3.0.0

[root@SRV]$ mongoexport --version mongoexport version: 3.0.0 git version: e35a2e87876251835fcb60f5eb0c29baca04bc5e

[root@SRV]$ mongos --version MongoS version 3.0.0 starting: pid=47359 port=27017 64-bit host=SRV (--help for usage) git version: a841fd6394365954886924a35076691b4d149168 OpenSSL version: OpenSSL 1.0.1e-fips 11 Feb 2013 build sys info: Linux ip-10-181-61-91 2.6.32-220.el6.x86_64 #1 SMP Wed Nov 9 08:03:13 EST 2011 x86_64 BOOST_LIB_VERSION=1_49

Tried with a 2.6 mongoexport in another server against our mongod3.0 and mongos3.0 and works fine

This is the second time I've seen a report like this, and there have been issues like this with the Go driver in the past - the tools were rewritten in Go for 3.0. Could you open a ticket in the MongoDB TOOLS project with a description of the issue so the engineers can look at it? — wdberkeley
I did, 3.0.1 should have a fix for this (jira.mongodb.org/browse/TOOLS-652) Thanks! — user3163247

alkanschtein alkanschtein · Accepted Answer · 2020-01-10T14:18:13

This is an old question but I wanted to answer. Maybe this answer will help one of us. It might be caused by someone else trying to write to the collection you are writing. I had a smilar problem. After a long research I realised that a user with higher role was trying to write in the sametime and because his/her role is more important than mine ones request were done and mine are given IO exception.

Mongoexport with cluster throws i/o timeout error

2 Answers