ChenSammi commented on code in PR #4128:
URL: https://github.com/apache/ozone/pull/4128#discussion_r1064372408
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hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/ratis/RatisHelper.java:
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@@ -483,4 +488,81 @@ public static void debug(ByteBuf buf, String name, Logger
log) {
}
log.debug("{}: {}\n {}", name, buf, builder);
}
+
+
+ /**
+ * Use raft client to send admin request, transfer the leadership.
+ * If not isRandom, then use host to match the target leader.
+ * 1. Set priority and send setConfiguration request
+ * 2. Trigger transferLeadership API.
+ *
+ * @param server the Raft server
+ * @param groupId the Raft group Id
+ * @param targetPeerId the target expected leader
+
+ * @throws IOException
+ */
+ public static void transferRatisLeadership(RaftServer server,
+ RaftGroupId groupId, RaftPeerId targetPeerId)
+ throws IOException {
+ RaftGroup raftGroup = server.getDivision(groupId).getGroup();
+ RaftClient raftClient = createBackoffRaftClient(raftGroup);
+ if (!raftGroup.getPeers().stream().map(RaftPeer::getId)
+ .collect(Collectors.toSet()).contains(targetPeerId)) {
+ throw new IOException("Cannot choose the target leader. The expected " +
+ "leader RaftPeerId is " + targetPeerId + " and the peers are " +
+ raftGroup.getPeers().stream().map(RaftPeer::getId)
+ .collect(Collectors.toList()) + ".");
+ }
+ LOG.info("Chosen the targetLeaderId {} to transfer leadership",
+ targetPeerId);
+
+ // Set priority
+ List<RaftPeer> peersWithNewPriorities = new ArrayList<>();
+ for (RaftPeer peer : raftGroup.getPeers()) {
+ peersWithNewPriorities.add(
+ RaftPeer.newBuilder(peer)
+ .setPriority(peer.getId().equals(targetPeerId) ? 2 : 1)
Review Comment:
Does this "2" : "1" work for multiple leader transfers?
For example, there is scm1, scm2, scm3 with priority 1 ,1, 1 at the
beginning. scm1 is the leader.
1. transfer leader to scm2, then service with priority will be scm1(1),
scm(2), scm3(1).
2. transfer leader to scm3, will this "2":"1" still work?
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