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From Gagan Brahmi <gaganbra...@gmail.com>
Subject Master Segment Communication Issues
Date Tue, 03 May 2016 15:30:37 GMT
Hi All,

I was looking to check if anyone has seen this behavior where segments
are not able to communicate with the master in HAWQ 2.0.

In a single node setup I don't see any problem with the segment and
master communication. The problem seems to be visible if there is two
or three machine involved in the hawq cluster.

The gp_segment_configuration reports the segment. It is reported up
for a few seconds and then it turns it down. If you execute any
queries the segment is no longer found in the

Nothing can be found in gp_configuration or gp_configuration_history.
hawqstate reports "failures at master" for the segments.

I found a jira which had pretty much similar behavior (except for core
dumps which I haven't seen yet. Since I am not able run any queries.).
The jira in question is https://issues.apache.org/jira/browse/HAWQ-323

This issue was closed stating duplicate IP. I am trying to understand
if that can be the case.

There is no firewall between the segments. Nothing in blocking port
40000, 5432, 5437 or 5438. Segment starts up fine. psql to segments on
port 40000 works fine as well.

There is no error in the segments or master logs or startup logs.

I tried to integrate hawq with YARN and also using it's own
ResourceManager, but found similar behavior. Tried to set the
heartbeat interval to 10 seconds (hawq_rm_segment_heartbeat_interval =
10 in hawq-site.xml) but no change in the behavior.

Am I missing anything here? Has anyone found similar behavior before?

Gagan Brahmi

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