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Kaushik Lingarkar 8bc166b00d BatchRefUpdate: Skip saving conflicting ref names and prefixes in memory Rather than getting all ref names and prefixes and saving them in memory to perform the check for conflicting names, rely on RefDirectory.isNameConflicting as it is no longer an expensive call after it was optimized in Ie994fc. The old optimization to save ref names and prefixes in memory was targeted towards making clones faster. With this change, the clone performance is unaffected when tests were done with repos containing many(~500k) refs. Here are few recorded elapsed times for creating 10 branches using BatchRefUpdate on NFS based repositories with varying loose refs count. As seen here, this change helps improve the BatchRefUpdate performance from O(n^2) to O(1). loose_refs_count with_change without_change 50 241 ms 310 ms 300 263 ms 1502 ms 1k 181 ms 4241 ms 2k 204 ms 6440 ms 9k 158 ms 25930 ms 20k 154 ms 60443 ms 50k 171 ms 135199 ms 110k 157 ms 329450 ms 160k 209 ms 396328 ms This update improves the Gerrit notedb migration performance as it uses BatchRefUpdate to write change meta refs similar to the test performed above. Change-Id: I853ac6c7feb4b39c3156c01876b38cbd182accfe Signed-off-by: Kaushik Lingarkar <quic_kaushikl@quicinc.com>		3 years ago
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annotations	Revert usage of TYPE_USE in Nullable and NonNull annotations	6 years ago
api	Fix copy-paste typo in CloneCommand#cleanup	4 years ago
attributes	Deprecate Constants.CHARSET in favor of StandardCharsets.UTF_8	5 years ago
blame	Fix API breakage introduced by da254106	5 years ago
diff	Use the same default diff.renameLimit = 400 like native git	5 years ago
dircache	Avoid sign extension when comparing mtime with Instant#getEpochSecond	4 years ago
errors	Merge branch 'stable-4.11' into stable-5.0	5 years ago
events	Store in IndexChangedEvent if it was caused by JGit itself	6 years ago
fnmatch	Remove further unnecessary 'final' keywords	6 years ago
gitrepo	RepoText: Remove unused externalized string	4 years ago
hooks	Deprecate Constants.CHARSET in favor of StandardCharsets.UTF_8	5 years ago
ignore	Deprecate Constants.CHARSET in favor of StandardCharsets.UTF_8	5 years ago
internal	Optimize RefDirectory.isNameConflicting()	2 years ago
lib	BatchRefUpdate: Skip saving conflicting ref names and prefixes in memory	2 years ago
merge	Stop using deprecated Constants.CHARACTER_ENCODING	4 years ago
nls	Don't subclass ThreadLocal to avoid memory leak in NLS	6 years ago
notes	Remove 'final' in parameter lists	6 years ago
patch	Deprecate Constants.CHARSET in favor of StandardCharsets.UTF_8	5 years ago
revplot	refactor: simplify collection.toArray()	5 years ago
revwalk	Parse signature of GPG-signed commits	5 years ago
storage	WindowCache: add metric for cached bytes per repository	4 years ago
submodule	Remove 'final' in parameter lists	6 years ago
transport	JschConfigSessionFactory: fix boxing warning	4 years ago
treewalk	Replace usage of ArrayIndexOutOfBoundsException in treewalk	4 years ago
util	SshSupport#runSshCommand: don't throw exception in finally block	4 years ago