hawq-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From yo...@apache.org
Subject [1/3] incubator-hawq-docs git commit: add reverse dns lookup failure error to client troubleshooting table
Date Wed, 19 Oct 2016 17:28:38 GMT
Repository: incubator-hawq-docs
Updated Branches:
  refs/heads/develop 8c10c5509 -> 19c676a70

add reverse dns lookup failure error to client troubleshooting table

Project: http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/commit/0b1597af
Tree: http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/tree/0b1597af
Diff: http://git-wip-us.apache.org/repos/asf/incubator-hawq-docs/diff/0b1597af

Branch: refs/heads/develop
Commit: 0b1597af13d3dcc6995464faddf04cd968f0dc62
Parents: a819abd
Author: Lisa Owen <lowen@pivotal.io>
Authored: Mon Oct 10 16:45:20 2016 -0700
Committer: Lisa Owen <lowen@pivotal.io>
Committed: Mon Oct 10 16:45:20 2016 -0700

 clientaccess/g-troubleshooting-connection-problems.html.md.erb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/clientaccess/g-troubleshooting-connection-problems.html.md.erb b/clientaccess/g-troubleshooting-connection-problems.html.md.erb
index cceaf0a..2cd6815 100644
--- a/clientaccess/g-troubleshooting-connection-problems.html.md.erb
+++ b/clientaccess/g-troubleshooting-connection-problems.html.md.erb
@@ -10,3 +10,4 @@ A number of things can prevent a client application from successfully connecting
 |HAWQ is not running|If the HAWQ master instance is down, users will not be able to connect.
You can verify that the HAWQ system is up by running the `hawq state` utility on the HAWQ
master host.|
 |Network problems<br/><br/>Interconnect timeouts|If users connect to the HAWQ
master host from a remote client, network problems can prevent a connection \(for example,
DNS host name resolution problems, the host system is down, and so on.\). To ensure that network
problems are not the cause, connect to the HAWQ master host from the remote client host. For
example: `ping hostname`. <br/><br/>If the system cannot resolve the host names
and IP addresses of the hosts involved in HAWQ, queries and connections will fail. For some
operations, connections to the HAWQ master use `localhost` and others use the actual host
name, so you must be able to resolve both. If you encounter this error, first make sure you
can connect to each host in your HAWQ array from the master host over the network. In the
`/etc/hosts` file of the master and all segments, make sure you have the correct host names
and IP addresses for all hosts involved in the HAWQ array. The `` IP must resolve
to `localho
 |Too many clients already|By default, HAWQ is configured to allow a maximum of 200 concurrent
user connections on the master and 1280 connections on a segment. A connection attempt that
causes that limit to be exceeded will be refused. This limit is controlled by the `max_connections`
parameter on the master instance and by the `seg_max_connections` parameter on segment instances.
If you change this setting for the master, you must also make appropriate changes at the segments.|
+|Query failure|Reverse DNS must be configured in your HAWQ cluster network. In cases where
reverse DNS has not been configured, failing queries will generate "Failed to reverse DNS
lookup for ip \<ip-address\>" messages to the HAWQ master node log file.  |

View raw message