Examples with GetJournalStateResponseProto org.apache.hadoop.hdfs.qjournal.protocol.QJournalProtocolProtos.GetJournalStateResponseProto used on opensource projects

Example 1 with GetJournalStateResponseProto

use of org.apache.hadoop.hdfs.qjournal.protocol.QJournalProtocolProtos.GetJournalStateResponseProto in project hadoop by apache.

the class QuorumJournalManager method createNewUniqueEpoch.

/**
   * Fence any previous writers, and obtain a unique epoch number
   * for write-access to the journal nodes.
   *
   * @return the new, unique epoch number
   */
Map<AsyncLogger, NewEpochResponseProto> createNewUniqueEpoch() throws IOException {
    Preconditions.checkState(!loggers.isEpochEstablished(), "epoch already created");
    Map<AsyncLogger, GetJournalStateResponseProto> lastPromises = loggers.waitForWriteQuorum(loggers.getJournalState(), getJournalStateTimeoutMs, "getJournalState()");
    long maxPromised = Long.MIN_VALUE;
    for (GetJournalStateResponseProto resp : lastPromises.values()) {
        maxPromised = Math.max(maxPromised, resp.getLastPromisedEpoch());
    }
    assert maxPromised >= 0;
    long myEpoch = maxPromised + 1;
    Map<AsyncLogger, NewEpochResponseProto> resps = loggers.waitForWriteQuorum(loggers.newEpoch(nsInfo, myEpoch), newEpochTimeoutMs, "newEpoch(" + myEpoch + ")");
    loggers.setEpoch(myEpoch);
    return resps;
}