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From "Chetan Mehrotra (JIRA)" <j...@apache.org>
Subject [jira] [Created] (OAK-7116) Use JMX mode to reindex on SegmentNodeStore without requiring manual steps
Date Tue, 02 Jan 2018 11:06:00 GMT
Chetan Mehrotra created OAK-7116:

             Summary: Use JMX mode to reindex on SegmentNodeStore without requiring manual
                 Key: OAK-7116
                 URL: https://issues.apache.org/jira/browse/OAK-7116
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: run
            Reporter: Chetan Mehrotra
            Assignee: Chetan Mehrotra
             Fix For: 1.10

oak-run indexing for SegmentNodeStore currently require following steps while performing indexing
against a repository which is in use [1]

# Create checkpoint via MBean and pass it as part of cli args
# Perform actual indexing with read only access to repo
# Import the index via MBean operation 

As per current documented steps #1 and #3 are manual. This can potentially be simplified by
directly using JMX operation from within oak-run as currently for accessing SegmentNodeStore
oak-run needs to run on same host as actual application

*JMX Access*

JMX access can be done via following ways

# Application using Oak has JMX remote 
## Enabled and same info provided as cli args
## Not enabled - In such a case we can rely on 
### pid and [local connection|https://stackoverflow.com/questions/13252914/how-to-connect-to-a-local-jmx-server-by-knowing-the-process-id]

### Or query all running java prcess jmx and check if SegmentNodeStore repo path is same as
one provided in cli
# Application using OAk

*Proposed Approach*

# Establish the JMX connection
# Create checkpoint using the JMX connection programatically
# Perform indexing with read only access
# Import the index via JMX access

With this indexing support for SegmentNodeStore would be at par with DocumentNodeStore in
terms of ease of use
[1] https://jackrabbit.apache.org/oak/docs/query/oak-run-indexing.html

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