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From y_823...@tsmc.com
Subject Re: Save data to HBase
Date Wed, 02 Sep 2009 08:03:51 GMT
Hi,

I tried to find out why my client always raised Failed to create /hbase
exception.
It's in the ZooKeeperWrapper.java.
I want to know why KeeperException or InterruptedException will raise.
Does ZK has any control to limit the create znode number?
(My concurrent client is just 5)
Thanks

Fleming

  private boolean ensureExists(final String znode) {
    try {
      zooKeeper.create(znode, new byte[0],
                       Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
      LOG.debug("Created ZNode " + znode);
      return true;
    } catch (KeeperException.NodeExistsException e) {
      return true;      // ok, move on.
    } catch (KeeperException.NoNodeException e) {
      return ensureParentExists(znode) && ensureExists(znode);
    } catch (KeeperException e) {
      LOG.warn("Failed to create " + znode +
        " -- check quorum servers, currently=" + this.quorumServers, e);
    } catch (InterruptedException e) {
      LOG.warn("Failed to create " + znode +
        " -- check quorum servers, currently=" + this.quorumServers, e);
    }
    return false;
  }

WARN zookeeper.ZooKeeperWrapper: Failed to create /hbase -- check quorum
servers, currently=10.42.253.86:2181,10.42.253.182:2181,10.42.254.37:2181
org.apache.zookeeper.KeeperException$ConnectionLossException:
KeeperErrorCode = ConnectionLoss for /hbase
      at
org.apache.zookeeper.KeeperException.create(KeeperException.java:90)
      at
org.apache.zookeeper.KeeperException.create(KeeperException.java:42)
      at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:522)
      at
org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.ensureExists(ZooKeeperWrapper.java:342)
      at
org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.ensureParentExists(ZooKeeperWrapper.java:365)
      at
org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.checkOutOfSafeMode(ZooKeeperWrapper.java:478)
      at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRootRegion(HConnectionManager.java:846)
      at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:515)
      at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:491)
      at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:565)
      at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:524)
      at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:491)
      at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:565)
      at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:528)
      at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:491)
      at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:123)
      at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:78)
      at save2HBaseThread.putFRPF(save2HBaseThread.java:105)
      at save2HBaseThread.run(save2HBaseThread.java:66)
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