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https://issues.apache.org/jira/browse/PHOENIX-3654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16056608#comment-16056608
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ASF GitHub Bot commented on PHOENIX-3654:
-----------------------------------------
Github user rahulsIOT commented on a diff in the pull request:
https://github.com/apache/phoenix/pull/236#discussion_r123116803
--- Diff: phoenix-queryserver/src/it/resources/log4j.properties ---
@@ -1,63 +0,0 @@
-# Licensed to the Apache Software Foundation (ASF) under one
-# or more contributor license agreements. See the NOTICE file
-# distributed with this work for additional information
-# regarding copyright ownership. The ASF licenses this file
-# to you under the Apache License, Version 2.0 (the
-# "License"); you may not use this file except in compliance
-# with the License. You may obtain a copy of the License at
-#
-# http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
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-
-# Define some default values that can be overridden by system properties
-hbase.root.logger=DEBUG,console
--- End diff --
yes. sorry. will quickly fix this.
> Load Balancer for thin client
> -----------------------------
>
> Key: PHOENIX-3654
> URL: https://issues.apache.org/jira/browse/PHOENIX-3654
> Project: Phoenix
> Issue Type: New Feature
> Affects Versions: 4.8.0
> Environment: Linux 3.13.0-107-generic kernel, v4.9.0-HBase-0.98
> Reporter: Rahul Shrivastava
> Assignee: Rahul Shrivastava
> Fix For: 4.9.0
>
> Attachments: LoadBalancerDesign.pdf, Loadbalancer.patch
>
> Original Estimate: 240h
> Remaining Estimate: 240h
>
> We have been having internal discussion on load balancer for thin client for
> PQS. The general consensus we have is to have an embedded load balancer with
> the thin client instead of using external load balancer such as haproxy. The
> idea is to not to have another layer between client and PQS. This reduces
> operational cost for system, which currently leads to delay in executing
> projects.
> But this also comes with challenge of having an embedded load balancer which
> can maintain sticky sessions, do fair load balancing knowing the load
> downstream of PQS server. In addition, load balancer needs to know location
> of multiple PQS server. Now, the thin client needs to keep track of PQS
> servers via zookeeper ( or other means).
> In the new design, the client ( PQS client) , it is proposed to have an
> embedded load balancer.
> Where will the load Balancer sit ?
> The load load balancer will embedded within the app server client.
> How will the load balancer work ?
> Load balancer will contact zookeeper to get location of PQS. In this case,
> PQS needs to register to ZK itself once it comes online. Zookeeper location
> is in hbase-site.xml. It will maintain a small cache of connection to the
> PQS. When a request comes in, it will check for an open connection from the
> cache.
> How will load balancer know load on PQS ?
> To start with, it will pick a random open connection to PQS. This means that
> load balancer does not know PQS load. Later , we can augment the code so that
> thin client can receive load info from PQS and make intelligent decisions.
> How will load balancer maintain sticky sessions ?
> While we still need to investigate how to implement sticky sessions. We can
> look for some open source implementation for the same.
> How will PQS register itself to service locator ?
> PQS will have location of zookeeper in hbase-site.xml and it would register
> itself to the zookeeper. Thin client will find out PQS location using
> zookeeper.
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