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Vikas Saurabh edited comment on OAK-2808 at 6/6/17 11:39 AM: ------------------------------------------------------------- Done changes specified in review at [r1797738|https://svn.apache.org/r1797738]. With OAK-6227 done in [r1797739|https://svn.apache.org/r1797739], done scheduling of blob purge at [r1797740|https://svn.apache.org/r1797740]. *EDIT*: [r1797778|https://svn.apache.org/r1797778] updated checkpoint mbean methods and have 2 methods instead. Refactored code for this issue wrt that change in the same commit. Resolving this issue - further improvements (like stats, etc) to be done in separate issue(s). was (Author: catholicon): Done changes specified in review at [r1797738|https://svn.apache.org/r1797738]. With OAK-6227 done in [r1797739|https://svn.apache.org/r1797739], done scheduling of blob purge at [r1797740|https://svn.apache.org/r1797740]. Resolving this issue - further improvements (like stats, etc) to be done in separate issue(s). > Active deletion of 'deleted' Lucene index files from DataStore without > relying on full scale Blob GC > ---------------------------------------------------------------------------------------------------- > > Key: OAK-2808 > URL: https://issues.apache.org/jira/browse/OAK-2808 > Project: Jackrabbit Oak > Issue Type: Improvement > Components: lucene > Reporter: Chetan Mehrotra > Assignee: Vikas Saurabh > Labels: datastore, performance > Fix For: 1.8, 1.7.1 > > Attachments: copyonread-stats.png, OAK-2808-1.patch > > > With storing of Lucene index files within DataStore our usage pattern > of DataStore has changed between JR2 and Oak. > With JR2 the writes were mostly application based i.e. if application > stores a pdf/image file then that would be stored in DataStore. JR2 by > default would not write stuff to DataStore. Further in deployment > where large number of binary content is present then systems tend to > share the DataStore to avoid duplication of storage. In such cases > running Blob GC is a non trivial task as it involves a manual step and > coordination across multiple deployments. Due to this systems tend to > delay frequency of GC > Now with Oak apart from application the Oak system itself *actively* > uses the DataStore to store the index files for Lucene and there the > churn might be much higher i.e. frequency of creation and deletion of > index file is lot higher. This would accelerate the rate of garbage > generation and thus put lot more pressure on the DataStore storage > requirements. > Discussion thread http://markmail.org/thread/iybd3eq2bh372zrl -- This message was sent by Atlassian JIRA (v6.3.15#6346)