public synchronized void addToFailedServers(Address address, Throwable throwable) {
    final long expiry = EnvironmentEdgeManager.currentTime() + recheckServersTimeout;
    this.failedServers.put(address, expiry);
    this.latestExpiry = expiry;
    if (LOG.isDebugEnabled()) {
      LOG.debug("Added failed server with address " + address + " to list caused by "
        + throwable.toString());
    }
  }
Add an address to the list of the failed servers list.
hbase-client/src/main/java/org/apache/hadoop/hbase/ipc/FailedServers.java