Package org.apache.jackrabbit.oak.plugins.document.mongo

Class MongoVersionGCSupport

java.lang.Object

org.apache.jackrabbit.oak.plugins.document.VersionGCSupport

org.apache.jackrabbit.oak.plugins.document.mongo.MongoVersionGCSupport

public class MongoVersionGCSupport
extends VersionGCSupport

Mongo specific version of VersionGCSupport which uses mongo queries to fetch required NodeDocuments

Version collection involves looking into old record and mostly unmodified documents. In such case read from secondaries are preferred

Constructor Summary

Constructors

Constructor	Description
MongoVersionGCSupport(MongoDocumentStore store)

Method Summary

Modifier and Type	Method	Description
protected SplitDocumentCleanUp	createCleanUp(java.util.Set<NodeDocument.SplitDocType> gcTypes, RevisionVector sweepRevs, long oldestRevTimeStamp, VersionGarbageCollector.VersionGCStats stats)
long	getDeletedOnceCount()
long	getOldestDeletedOnceTimestamp(org.apache.jackrabbit.oak.stats.Clock clock, long precisionMs)	Retrieve the time of the oldest document marked as 'deletedOnce'.
CloseableIterable<NodeDocument>	getPossiblyDeletedDocs(long fromModified, long toModified)	Returns documents that have a NodeDocument.MODIFIED_IN_SECS value within the given range and the NodeDocument.DELETED set to true.
protected java.lang.Iterable<NodeDocument>	identifyGarbage(java.util.Set<NodeDocument.SplitDocType> gcTypes, RevisionVector sweepRevs, long oldestRevTimeStamp)

Methods inherited from class org.apache.jackrabbit.oak.plugins.document.VersionGCSupport

getDocumentStore, isDefaultNoBranchSplitNewerThan

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MongoVersionGCSupport

public MongoVersionGCSupport(MongoDocumentStore store)

Method Detail

getPossiblyDeletedDocs

public CloseableIterable<NodeDocument> getPossiblyDeletedDocs(long fromModified,
                                                              long toModified)

Description copied from class: VersionGCSupport

Returns documents that have a NodeDocument.MODIFIED_IN_SECS value within the given range and the NodeDocument.DELETED set to true. The two passed modified timestamps are in milliseconds since the epoch and the implementation will convert them to seconds at the granularity of the NodeDocument.MODIFIED_IN_SECS field and then perform the comparison.

Overrides:

getPossiblyDeletedDocs in class VersionGCSupport

Parameters:

fromModified - the lower bound modified timestamp (inclusive)

toModified - the upper bound modified timestamp (exclusive)

Returns:

matching documents.

getDeletedOnceCount

public long getDeletedOnceCount()

Overrides:

getDeletedOnceCount in class VersionGCSupport

createCleanUp

protected SplitDocumentCleanUp createCleanUp(java.util.Set<NodeDocument.SplitDocType> gcTypes,
                                             RevisionVector sweepRevs,
                                             long oldestRevTimeStamp,
                                             VersionGarbageCollector.VersionGCStats stats)

Overrides:

createCleanUp in class VersionGCSupport

identifyGarbage

protected java.lang.Iterable<NodeDocument> identifyGarbage(java.util.Set<NodeDocument.SplitDocType> gcTypes,
                                                           RevisionVector sweepRevs,
                                                           long oldestRevTimeStamp)

Overrides:

identifyGarbage in class VersionGCSupport

getOldestDeletedOnceTimestamp

public long getOldestDeletedOnceTimestamp(org.apache.jackrabbit.oak.stats.Clock clock,
                                          long precisionMs)

Description copied from class: VersionGCSupport

Retrieve the time of the oldest document marked as 'deletedOnce'.

Overrides:

getOldestDeletedOnceTimestamp in class VersionGCSupport

precisionMs - the exact time may vary by given precision

Returns:

the timestamp of the oldest document marked with 'deletecOnce', module given prevision. If no such document exists, returns the max time inspected (close to current time).