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1. Migrate users and groups (If users were not imported automatically via LDAP) Package users and groups (2 separate packages) on the old system (excluding admin and anonymous OOTB users)
   1. Go to CRXDE lite app /crx/de/index.jsp and log in as admin user (on the old system)
   2. Go to "Tools" => "Query"
   3. In the bottom "Query" box enter this query to find the admin user: /jcr:root/home/users//element(*,rep:User)[@rep:principalName="admin"]
   4. Click "Execute" and copy the path of the admin user node in the results to a text file
   5. Repeat step 3 with a query for anonymous user: /jcr:root/home/users//element(*,rep:User)[@rep:principalName="anonymous"]
   6. Click "Execute" and copy the path of the anonymous user node in the results to a text file (so now you should have two paths, one for "admin" and one for "anonymous")

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To run this script:

1. Download the oak-run version matching the version of Oak installed in AEM: http://repo1.maven.org/maven2/org/apache/jackrabbit/oak-run
2. Download the attached adminUtils.groovy script
3. Upload the adminUtils.groovy script and the oak-run jar to your AEM server
4. Run the command to start the oak-run console. For example:

   java -Xmx2048m -jar /tmp/oak-run-1.6.1.jar console /app/aem/aem63/crx-quickstart/repository/segmentstore --read-write
   

5. Once the oak-run console is open then load the groovy script using this command:

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1. Go to http://host:port/system/console/bundles and install these two bundles
   • http://apache.mirrors.lucidnetworks.net//felix/org.apache.felix.webconsole.plugins.scriptconsole-1.0.2.jar
   • http://repo1.maven.org/maven2/org/codehaus/groovy/groovy-all/2.4.9/groovy-all-2.4.9.jar
2. Go to http://host/system/console/configMgr/org.apache.sling.jcr.base.internal.LoginAdminWhitelist
3. Add org.apache.felix.webconsole.plugins.scriptconsole to "Whitelist regexp" and save
4. After the two bundles fully install then go to http://host:port/system/console/sc
5. Select "Groovy" as the language
6. Copy/Paste the contents of countNodes-*.groovy script below which matches your oak version to the script console
7. Click "Execute"
8. Don't close the browser, the output is displayed in the console UI

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The objective here is to find all SegmentNotFoundException type corruption and remove it (as we don't have a valid backup)

Before running any of the below steps we created an index.json file (see the file below) which contains only the index definitions of the corrupted indexes.

1. This generates the file indexing-results\index-definities.json

java -Xmx8g -jar oak-run-1.8.12.jar index --fds-path=crx-quickstart\repository\datastore crx-quickstart\repository\segmentstore --index-definitions

2. From that file we copied only the definitions we needed and created index.json (file attached here )

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# Contributor: Joey Smith <joeysmith@gmail.com>
# Maintainer:
pkgname=flif
pkgver=0.3
pkgrel=0
pkgdesc="FLIF is a lossless image format which outperforms PNG, lossless WebP, lossless BPG, lossless JPEG2000, and lossless JPEG XR."
url="https://flif.info"
arch="all"
license="LGPLv3+"
depends="libpng"

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import ch.qos.logback.classic.Level
import com.google.common.base.Stopwatch
import org.apache.jackrabbit.oak.api.Blob
import org.apache.jackrabbit.oak.api.PropertyState
import org.apache.jackrabbit.oak.api.Type
import org.apache.jackrabbit.oak.commons.PathUtils
import org.apache.jackrabbit.oak.spi.state.ChildNodeEntry
import org.apache.jackrabbit.oak.spi.state.NodeState
import org.apache.jackrabbit.oak.spi.state.NodeStateUtils
import org.apache.jackrabbit.oak.spi.state.NodeStore

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root@ip-172-31-19-81:~# cat >> .bash_profile <<EOT
> echo "I ran the .bash_profile for root"
> EOT
root@ip-172-31-19-81:~# logout

(main) 23:33:16 [ joey@ip-172-31-19-81:0 ] ~ 2126 -->sudo -s
23:33:20 [ root@ip-172-31-19-81:0 ] ~ 494 -->exit

(main) 23:33:21 [ joey@ip-172-31-19-81:0 ] ~ 2127 -->sudo -i
I ran the .bash_profile for root

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<?php
$path = '';
foreach(array_filter(explode('/', '/var/run/memcached/memcached.socket')) as $p) {
    $path .= '/'.$p;
    if (file_exists($path)) {
                echo "{ '$path' : ", json_encode(stat($path)), "} \n";
        } else {
                echo "PHP cannot see $path.\n";
                exit(1);
        }

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def u_filter(func, iterable):
    if f is None:
        return (item for item in iterable if item)
    return (item for item in iterable if func(item))

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https://blogs.msdn.microsoft.com/scottdensmore/2004/05/25/why-singletons-are-evil/
http://steve.yegge.googlepages.com/singleton-considered-stupid
http://googletesting.blogspot.com/2008/11/clean-code-talks-global-state-and.html
https://www.alainschlesser.com/singletons-shared-instances/
http://misko.hevery.com/2008/08/17/singletons-are-pathological-liars/