Backport "HBASE-30058 Eliminate unnecessary connection creation in snapshot operations (#8030)" to branch-2.6#8314
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…rations (apache#8030) Each snapshot operation created two short-lived connections in SnapshotDescriptionUtils.validate() — one for isSecurityAvailable() to check hbase:acl table existence, and another in writeAclToSnapshotDescription() to read ACL data. In Kerberos environments with ZKConnectionRegistry, each connection triggered a new ZK session with GSSAPI authentication and a TGS request to the KDC, causing excessive KDC load during batch snapshot operations. This patch reuses the caller's existing connection instead of creating new ones: - isSecurityAvailable() now accepts a Connection parameter - writeAclToSnapshotDescription() passes the shared connection's Table to PermissionStorage.getTablePermissions() - All callers (MasterRpcServices, RestoreSnapshotProcedure, CloneSnapshotProcedure) pass through their available connection The original validate(SnapshotDescription, Configuration) and isSecurityAvailable(Configuration) signatures are preserved as overloads that delegate to the new Connection-based methods, so existing callers (including tests) keep working unchanged. The new Connection-based overloads are documented as preferred for callers that already hold a Connection, to avoid the per-call connection setup cost. Co-authored-by: juke-mini666 <juke.mini666@kakaocorp.com> Signed-off-by: Junegunn Choi <junegunn@apache.org>
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