CMS today releases it's lock after finishing a merge before it re-acquires it to update
the thread accounting datastructures. This causes threading issues where concurrently
finishing threads fail to pick up pending merges causing potential thread starvation
on forceMerge calls.
Speed up geometry queries by specialising Component2D spatial operations. Instead of using a generic relate method for all relations, we use specialise methods for each one. In addition, the type of triangle is computed at deserialisation time, therefore we can be more selective when decoding points of a triangle
We already have IDs in SegmentInfo, as well as on SegmentInfos which are useful to uniquely identify segments and entire commits. Having IDs on SegmentCommitInfo is be useful too in
order to compare commits for equality and make snapshots incremental on generational files.
This change adds a unique ID to SegmentCommitInfo starting from Lucene 8.6. Older segments won't have an ID until the segment receives an update or a delete even if they have been opened and / or committed by Lucene 8.6 or above.
This change moves the deletes tracked by FrozenBufferedUpdates that
are private to the DWPT and never used in a global context out of
FrozenBufferedUpdates.
After recent refactoring on LUCENE-9304 `IW#getMaxCompletedSequenceNumber()` might
return values that belong to non-completed operations if a full flush is running, a new delete
queue is already in place but not all DWPTs that participate in the full flush have finished it's in
flight operation. This caused rare failures in
`TestControlledRealTimeReopenThread#testControlledRealTimeReopenThread` where
documents are not actually visible given the max completed seqNo. This change streamlines
the delete queue advance, adds a dedicated testcase and ensures that a delete queues
sequence Id space is never exhausted.
This change removes the ThreadState indirection from DWPTPool and pools DWPT directly. The tracking information and locking semantics are mostly moved to DWPT directly and the pool semantics have changed slightly such that DWPT need to be checked-out in the pool once they need to be flushed or aborted. This automatically grows and shrinks the number of DWPT in the system when number of threads grow or shrink. Access of pooled DWPTs is more straight forward and doesn't require ordinal. Instead consumers can just iterate over the elements in the pool.
This allowed for removal of indirections in DWPTFlushControl like BlockedFlush, the removal of DWPTPool setter and getter in IndexWriterConfig and the addition of stronger assertions in DWPT and DW.
Mike Drob
Andrzej Bialecki
Adrien Grand
Simon Willnauer
Mike McCandless
Jan Høydahl
Erick Erickson
Ignacio Vera
David Smiley
Kevin Risden
Jan Høydahl
Tommaso Teofili
Markus Schuch
Mikhail Khludnev
Julie Tibshirani
Dawid Weiss
Shalin Shekhar Mangar
Trey Grainger
Dawid Weiss