Method to fix issue when you get KeeperErrorCode = NoAuth when Zookeeper ACL enabled

[Jeff Wu <wu...@gmail.com>]

We have being following this wiki to enable ZooKeeper ACL control
https://cwiki.apache.org/confluence/display/solr/ZooKeeper+Access+Control#ZooKeeperAccessControl-AboutZooKeeperACLs

It works fine for Solr service itself, but when you try to
use scripts/cloud-scripts/zkcli.sh to put a zNode, it throws such exception:

   Exception in thread "main"
org.apache.zookeeper.KeeperException$NoAuthException: KeeperErrorCode =
NoAuth for /security.json
at org.apache.zookeeper.KeeperException.create(KeeperException.java:113)
at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
at org.apache.zookeeper.ZooKeeper.setData(ZooKeeper.java:1270)
at
org.apache.solr.common.cloud.SolrZkClient$8.execute(SolrZkClient.java:362)
at
org.apache.solr.common.cloud.SolrZkClient$8.execute(SolrZkClient.java:359)
at
org.apache.solr.common.cloud.ZkCmdExecutor.retryOperation(ZkCmdExecutor.java:61)
at org.apache.solr.common.cloud.SolrZkClient.setData(SolrZkClient.java:359)

To fix the problem, the wiki needs to be updated(however I can not put a
comment in that wiki):

SOLR_ZK_CREDS_AND_ACLS="*-DzkACLProvider=org.apache.solr.common.cloud.VMParamsAllAndReadonlyDigestZkACLProvider
-DzkCredentialsProvider=org.apache.solr.common.cloud.VMParamsSingleSetCredentialsDigestZkCredentialsProvider*
-DzkDigestUsername=admin-user -DzkDigestPassword=admin-password
-DzkDigestReadonlyUsername=readonly-user
-DzkDigestReadonlyPassword=readonly-password"


I think the reason is zkcli.sh is a standard JVM process and does not read
settings from solr.xml, so we must explicitly provide these parameters in
order to make ZK ACL work.

Could someone help to notify the wiki editor to update this? Right now this
wiki will lead people to a dead end with zkcli.sh to put content to ZK
ensemble with ACL enabled