public Set<ServerName> getLiveServersFromWALDir() throws IOException {
    return getServerNamesFromWALDirPath(
      p -> !p.getName().endsWith(AbstractFSWALProvider.SPLITTING_EXT));
  }
Get Servernames that COULD BE 'alive'; excludes those that have a '-splitting' suffix as these
are already being split -- they cannot be 'alive'.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterWalManager.java