[jira] [Created] (OAK-7849) CommitHook for recording write operations to the segment store

["Axel Hanikel (JIRA)" <ji...@apache.org>]

Axel Hanikel created OAK-7849:
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             Summary: CommitHook for recording write operations to the segment store
                 Key: OAK-7849
                 URL: https://issues.apache.org/jira/browse/OAK-7849
             Project: Jackrabbit Oak
          Issue Type: New Feature
          Components: segment-tar
    Affects Versions: 1.9.9
            Reporter: Axel Hanikel


In order to increase reproducibility of tests which measure things like the duration of operations or their latency, the idea is to record a log of the changes committed to the segment store, which could later be replayed. That replay is expected to produce the same results when run on the same machine under the same conditions. That way, different versions of the segment store can be compared more easily.

 The log could look like this:
{noformat}
1537963348079 FelixStartLevel n+ :clusterConfig
1537963348079 FelixStartLevel p+ :clusterId <STRING> = bf462164-be56-4023-94ef-f8bafc3eb49f
1537963348079 FelixStartLevel n!
1537963348079 FelixStartLevel n!
1537963350142 Apache+Sling+Repository+Startup+Thread p+ jcr:primaryType <NAME> = rep:root
1537963350142 Apache+Sling+Repository+Startup+Thread n+ oak:index
1537963350142 Apache+Sling+Repository+Startup+Thread p+ jcr:primaryType <NAME> = nt:unstructured
1537963350142 Apache+Sling+Repository+Startup+Thread n+ socialLucene
1537963350142 Apache+Sling+Repository+Startup+Thread p+ jcr:primaryType <NAME> = oak:QueryIndexDefinition
1537963350142 Apache+Sling+Repository+Startup+Thread p+ compatVersion <LONG> = 2
1537963350142 Apache+Sling+Repository+Startup+Thread p+ name <STRING> = socialLucene
1537963350142 Apache+Sling+Repository+Startup+Thread p+ type <STRING> = lucene
1537963350142 Apache+Sling+Repository+Startup+Thread p+ async <STRINGS> = [async,nrt]
1537963350142 Apache+Sling+Repository+Startup+Thread p+ evaluatePathRestrictions <BOOLEAN> = true
1537963350142 Apache+Sling+Repository+Startup+Thread p+ reindex <BOOLEAN> = true
1537963350143 Apache+Sling+Repository+Startup+Thread n+ indexRules
1537963350143 Apache+Sling+Repository+Startup+Thread p+ jcr:primaryType <NAME> = nt:unstructured
1537963350143 Apache+Sling+Repository+Startup+Thread p+ :childOrder <NAMES> = [social:asiResource]
1537963350143 Apache+Sling+Repository+Startup+Thread n+ social:asiResource
1537963350143 Apache+Sling+Repository+Startup+Thread p+ jcr:primaryType <NAME> = nt:unstructured
1537963350143 Apache+Sling+Repository+Startup+Thread p+ :childOrder <NAMES> = [properties]{noformat}
where each line consists of a time stamp, the thread name, the operation (+ = added, - = removed, ^ = changed, ! = up to parent, n = node, p = property), the name (urlencoded except for : and / (for readability)), the type between angle brackets, and a value (urlencoded as well, and a comma-separated list between square brackets in case of multiple values). An 'n!' at the root node level ends a commit.



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