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Example 1 with STEPPED_DOWN

use of com.hazelcast.cp.internal.raft.impl.RaftNodeStatus.STEPPED_DOWN in project hazelcast by hazelcast.

the class RaftNodeImpl method takeSnapshotIfCommitIndexAdvanced.

/**
 * Takes a snapshot if the advance in {@code commitIndex} is equal to
 * {@link RaftAlgorithmConfig#getCommitIndexAdvanceCountToSnapshot()}.
 * <p>
 * Snapshot is not created if the Raft group is being destroyed.
 */
@SuppressWarnings("checkstyle:npathcomplexity")
private void takeSnapshotIfCommitIndexAdvanced() {
    long commitIndex = state.commitIndex();
    if ((commitIndex - state.log().snapshotIndex()) < commitIndexAdvanceCountToSnapshot) {
        return;
    }
    if (isTerminatedOrSteppedDown()) {
        // If the status is TERMINATED or STEPPED_DOWN, then there will not be any new appends.
        return;
    }
    RaftLog log = state.log();
    Object snapshot = raftIntegration.takeSnapshot(commitIndex);
    if (snapshot instanceof Throwable) {
        Throwable t = (Throwable) snapshot;
        logger.severe("Could not take snapshot at commit index: " + commitIndex, t);
        return;
    }
    int snapshotTerm = log.getLogEntry(commitIndex).term();
    RaftGroupMembers members = state.committedGroupMembers();
    SnapshotEntry snapshotEntry = new SnapshotEntry(snapshotTerm, commitIndex, snapshot, members.index(), members.members());
    long highestLogIndexToTruncate = commitIndex - maxNumberOfLogsToKeepAfterSnapshot;
    LeaderState leaderState = state.leaderState();
    if (leaderState != null) {
        long[] matchIndices = leaderState.matchIndices();
        // Last slot is reserved for leader index and always zero.
        // If there is at least one follower with unknown match index,
        // its log can be close to the leader's log so we are keeping the old log entries.
        boolean allMatchIndicesKnown = Arrays.stream(matchIndices, 0, matchIndices.length - 1).noneMatch(i -> i == 0);
        if (allMatchIndicesKnown) {
            // Otherwise, we will keep the log entries until the minimum match index
            // that is bigger than (commitIndex - maxNumberOfLogsToKeepAfterSnapshot).
            // If there is no such follower (all of the minority followers are far behind),
            // then there is no need to keep the old log entries.
            highestLogIndexToTruncate = Arrays.stream(matchIndices).filter(i -> i < commitIndex).filter(i -> i > commitIndex - maxNumberOfLogsToKeepAfterSnapshot).map(i -> i - 1).sorted().findFirst().orElse(commitIndex);
        }
    }
    int truncatedEntryCount = log.setSnapshot(snapshotEntry, highestLogIndexToTruncate);
    if (logger.isFineEnabled()) {
        logger.fine(snapshotEntry + " is taken, " + truncatedEntryCount + " entries are truncated.");
    }
}
Also used : RaftStateStore(com.hazelcast.cp.internal.raft.impl.persistence.RaftStateStore) AppendSuccessResponse(com.hazelcast.cp.internal.raft.impl.dto.AppendSuccessResponse) QueryTask(com.hazelcast.cp.internal.raft.impl.task.QueryTask) Arrays(java.util.Arrays) StaleAppendRequestException(com.hazelcast.cp.exception.StaleAppendRequestException) Clock(com.hazelcast.internal.util.Clock) MembershipChangeTask(com.hazelcast.cp.internal.raft.impl.task.MembershipChangeTask) PreVoteRequest(com.hazelcast.cp.internal.raft.impl.dto.PreVoteRequest) InitLeadershipTransferTask(com.hazelcast.cp.internal.raft.impl.task.InitLeadershipTransferTask) InstallSnapshot(com.hazelcast.cp.internal.raft.impl.dto.InstallSnapshot) LeaderDemotedException(com.hazelcast.cp.exception.LeaderDemotedException) Arrays.sort(java.util.Arrays.sort) VoteResponse(com.hazelcast.cp.internal.raft.impl.dto.VoteResponse) RaftState.restoreRaftState(com.hazelcast.cp.internal.raft.impl.state.RaftState.restoreRaftState) 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Aggregations

RaftAlgorithmConfig (com.hazelcast.config.cp.RaftAlgorithmConfig)1 CPGroupId (com.hazelcast.cp.CPGroupId)1 CPMember (com.hazelcast.cp.CPMember)1 LeaderDemotedException (com.hazelcast.cp.exception.LeaderDemotedException)1 StaleAppendRequestException (com.hazelcast.cp.exception.StaleAppendRequestException)1 MembershipChangeMode (com.hazelcast.cp.internal.raft.MembershipChangeMode)1 QueryPolicy (com.hazelcast.cp.internal.raft.QueryPolicy)1 DestroyRaftGroupCmd (com.hazelcast.cp.internal.raft.command.DestroyRaftGroupCmd)1 RaftGroupCmd (com.hazelcast.cp.internal.raft.command.RaftGroupCmd)1 ACTIVE (com.hazelcast.cp.internal.raft.impl.RaftNodeStatus.ACTIVE)1 INITIAL (com.hazelcast.cp.internal.raft.impl.RaftNodeStatus.INITIAL)1 STEPPED_DOWN (com.hazelcast.cp.internal.raft.impl.RaftNodeStatus.STEPPED_DOWN)1 TERMINATED (com.hazelcast.cp.internal.raft.impl.RaftNodeStatus.TERMINATED)1 TERMINATING (com.hazelcast.cp.internal.raft.impl.RaftNodeStatus.TERMINATING)1 UPDATING_GROUP_MEMBER_LIST (com.hazelcast.cp.internal.raft.impl.RaftNodeStatus.UPDATING_GROUP_MEMBER_LIST)1 FOLLOWER (com.hazelcast.cp.internal.raft.impl.RaftRole.FOLLOWER)1 LEADER (com.hazelcast.cp.internal.raft.impl.RaftRole.LEADER)1 UpdateRaftGroupMembersCmd (com.hazelcast.cp.internal.raft.impl.command.UpdateRaftGroupMembersCmd)1 AppendFailureResponse (com.hazelcast.cp.internal.raft.impl.dto.AppendFailureResponse)1 AppendRequest (com.hazelcast.cp.internal.raft.impl.dto.AppendRequest)1