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|SegmentReadLocker||SegmentReadLocker implementations have to make sure that segments are not deleted while they are being used by an IndexReader.|
|DistributedSegmentReadLocker||DistributedSegmentReadLocker stores reference counters in the cache to keep track of the number of clients still needing to be able to read a segment.|
|LocalLockMergingSegmentReadLocker||LocalLockMergingSegmentReadLocker decorates the
|NoopSegmentReadLocker||NoopSegmentReadLocker ignores requests to apply a readlock, but also ignores requests to delete files.|
Several implementations for a SegmentReadLocker, pick one depending on your use case. Lucene's default IndexDeletionPolicy could remove a segment while it's still used by another IndexReader; this is not an issue on a local filesystem, but could happen on Infinispan. To prevent deletion of in-use segments a read-lock is acquired when a segment is opened.