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HBase >> mail # dev >> zoo.cfg vs hbase-site.xml

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zoo.cfg vs hbase-site.xml

Usually the zoo.cfg overrides *all* settings off the hbase-site.xml
(including the ones from hbase-default.xml) - when present. But in some
places we do not consider this, for example in HConnectionManager:

  static {
    // We set instances to one more than the value specified for {@link
    // HConstants#ZOOKEEPER_MAX_CLIENT_CNXNS}. By default, the zk default
    // connections to the ensemble from the one client is 30, so in that
case we
    // should run into zk issues before the LRU hit this value of 31.
    MAX_CACHED_HBASE_INSTANCES = HBaseConfiguration.create().getInt(
    HBASE_INSTANCES = new LinkedHashMap<HConnectionKey,
        (int) (MAX_CACHED_HBASE_INSTANCES / 0.75F) + 1, 0.75F, true) {
      protected boolean removeEldestEntry(
          Map.Entry<HConnectionKey, HConnectionImplementation> eldest) {
         return size() > MAX_CACHED_HBASE_INSTANCES;
This only reads it from hbase-site.xml+hbase-default.xml. This is
inconsistent, I think this should use ZKConfig.makeZKProps(conf) and then
get the value.