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[CQ/AEM] SegmentNotFoundException

Issue:
When we see the error "org.apache.jackrabbit.oak.plugins.segment.SegmentNotFoundException: Segment 6e0a804f-0d75-48a8-a579-ebf34e58e763 not found" one day, and you can not open any pages, or can access neither crx nor console.

Solution:
We can use oak runnable to check and restore the last good revision into Oak's working directory.

Tool: Oak-run Tool (http://mvnrepository.com/artifact/org.apache.jackrabbit/oak-run)

Check more from http://cqhints.blogspot.com/2015/07/cq6-system-maintaining-repository.html

Step to restore Oak's working directory:
1. Backup all files in ./crx-quickstart/repository/segmentstore/.

2. Run the consistency check
java -jar oak-run-*.jar check -d1 --bin=-1 -p crx-quickstart/repository/segmentstore/

It will search backwards through the revisions until it finds a consistent one:
18:01:51.336 [main] INFO o.a.j.o.p.s.f.t.ConsistencyChecker - Found latest good revision ca9c71ae-1941-4a2d-aaed-c444db7a4c6d:260120

3. Revert the repository to this revision by editing ./crx-quickstart/repository/segmentstore/journal.log and deleting all lines after the line containing the latest good revision.

4. Remove all ./crx-quickstart/repository/segmentstore/*.bak files.

5. Run checkpoint clean-up to remove orphaned checkpoints:
java -jar oak-run-*.jar checkpoints ./crx-quickstart/repository/segmentstore rm-unreferenced

6. Finally compact the repository:
java -jar oak-run-*.jar compact ./crx-quickstart/repository/segmentstore/

If you are using AEM6.0, please do below steps before starting cleanup

Step 1: Download the service pack from Adobe package share (https://www.adobeaemcloud.com/content/marketplace/marketplaceProxy.html?packagePath=/content/companies/public/adobe/packages/aem600/servicepack/AEM-6.0-Service-Pack). Log on to this link, go to “ASSETS” tab and click on “Download to disk: AEM 6.0 Service Pack 1-1.0” link. This should download the service pack to your local system.
Step 2: Restart the AEM server.
Step 3: Once the AEM server is up, go to package manager using “http:<hostname>:<portname>/crx/packmgr” and upload the “AEM 6.0 Service Pack 1-1.0.zip” file downloaded from the package share and click on install.
Step 4: Wait until the full package is installed.
Step 5: Run a check on the instance if everything is working as expected.


Ref: https://github.com/apache/jackrabbit-oak/blob/trunk/oak-run/README.md#check

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