grails - Amazon Redshift: query execution hangs -

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i use amazon redshift , query execution hangs without error messages e.g. query execute:

select extract(year date), extract(week date),count(*) some_table  date>'2015-01-01 00:00:00' , date<'2015-12-31 23:59:59' group extract(year date), extract(week date)

and not:

select extract(year date), extract(week date),count(*) some_table  date>'2014-01-01 00:00:00' , date<'2014-12-27 23:59:59' group extract(year date), extract(week date)

but happens when deploy project server , on local machine queries executed without problems.

i set in code autocommit=true connection. things listed above grails using library

        compile 'com.amazonaws:aws-java-sdk-redshift:1.9.39'

any ideas?

this might not exact answer, it's long comment.

you may want check mtu setting on server performing execution.

redshift want's operate on 1500 bytes frame , ec2 instances set jumbo frame default (9000)

in order run queries without problems need have same mtu setting.

to check have, run command:

ip addr show eth0

an example output this:

eth0: <broadcast,multicast,up,lower_up> mtu 9001 qdisc pfifo_fast state qlen 1000

in case mtu 9001 need change 1500 running:

/sbin/ifconfig eth0 mtu 1500 up


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