[
https://issues.apache.org/jira/browse/DRILL-5098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15727060#comment-15727060
]
ASF GitHub Bot commented on DRILL-5098:
---------------------------------------
GitHub user sohami opened a pull request:
https://github.com/apache/drill/pull/679
DRILL-5098: Improving fault tolerance for connection between client a…
…nd foreman node.
Note: Adding tries config option in connection string.
Improving fault tolerance in Drill client when trying to
make first connection with foreman.
The client will try to connect to min(tries, num_drillbits)
unique drillbits unless a successfull
connection is established.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sohami/drill DRILL-5098
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/679.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #679
----
commit d13c6cc91b72b91b481bd1d428ca77775490a8cf
Author: Sorabh Hamirwasia <[email protected]>
Date: 2016-12-01T22:58:00Z
DRILL-5098: Improving fault tolerance for connection between client and
foreman node.
Note: Adding tries config option in connection string.
Improving fault tolerance in Drill client when trying to
make first connection with foreman.
The client will try to connect to min(tries, num_drillbits)
unique drillbits unless a successfull
connection is established.
----
> Improving fault tolerance for connection between client and foreman node.
> -------------------------------------------------------------------------
>
> Key: DRILL-5098
> URL: https://issues.apache.org/jira/browse/DRILL-5098
> Project: Apache Drill
> Issue Type: Improvement
> Components: Client - JDBC
> Reporter: Sorabh Hamirwasia
> Assignee: Sorabh Hamirwasia
> Labels: doc-impacting
> Fix For: 1.10
>
>
> With DRILL-5015 we allowed support for specifying multiple Drillbits in
> connection string and randomly choosing one out of it. Over time some of the
> Drillbits specified in the connection string may die and the client can fail
> to connect to Foreman node if random selection happens to be of dead Drillbit.
> Even if ZooKeeper is used for selecting a random Drillbit from the registered
> one there is a small window when client selects one Drillbit and then that
> Drillbit went down. The client will fail to connect to this Drillbit and
> error out.
> Instead if we try multiple Drillbits (configurable tries count through
> connection string) then the probability of hitting this error window will
> reduce in both the cases improving fault tolerance. During further
> investigation it was also found that if there is Authentication failure then
> we throw that error as generic RpcException. We need to improve that as well
> to capture this case explicitly since in case of Auth failure we don't want
> to try multiple Drillbits.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
