Hi,
I'm quite newbie into the HBase world, and I'm having basic problems.
I have installed a standalone version of HBase 0.20.6 into a Linux machine.
The web interface works ok.
Now with a basic Java client from another machine, I can successfully create
a table and some families.
I can also successfully add data with the Ruby shell.
The problem I'm having is that if I try this:
HBaseConfiguration hConfig = new HBaseConfiguration();
hConfig.set(HConstants.ZOOKEEPER_QUORUM, "myserver");
HTable tbl = new HTable(hConfig, "mytable");
my program hangs forever in the last step.
It happens always, even if I restart the HBase server.
I have looked in the server logs and the only relevant error I see is:
WARN org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper:
Failed to create out of safe mode in ZooKeeper:
org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode =
NodeExists for /hbase/safe-mode
WARN org.apache.zookeeper.server.PrepRequestProcessor:
Got exception when processing sessionid:0x12e7b26d3d50000 type:create
cxid:0xd zxid:0xfffffffffffffffe txntype:unknown n/a
org.apache.zookeeper.KeeperException$NodeExistsException:
KeeperErrorCode = NodeExists
at org.apache.zookeeper.server.PrepRequestProcessor.pRequest
(PrepRequestProcessor.java:245)
at org.apache.zookeeper.server.PrepRequestProcessor.run
(PrepRequestProcessor.java:114)
Here is the call stack of my hung Java client:
Thread [main] (Suspended)
Object.wait(long) line: not available [native method]
ClientCnxn$Packet(Object).wait() line: 485
ClientCnxn.submitRequest() line: 1099
ZooKeeper.exists(String, Watcher) line: 775
ZooKeeper.exists(String, boolean) line: 808
ZooKeeperWrapper.ensureExists(String) line: 405
ZooKeeperWrapper.ensureParentExists(String) line: 432
ZooKeeperWrapper.checkOutOfSafeMode() line: 545
HConnectionManager$TableServers.locateRootRegion() line: 964
HConnectionManager$TableServers.locateRegion(byte[], byte[], boolean)
line: 625
HConnectionManager$TableServers.locateRegion(byte[], byte[]) line: 601
HConnectionManager$TableServers.locateRegionInMeta(byte[], byte[],
byte[], boolean, Object) line: 670
HConnectionManager$TableServers.locateRegion(byte[], byte[], boolean)
line: 630
HConnectionManager$TableServers.locateRegion(byte[], byte[]) line: 601
HConnectionManager$TableServers.locateRegionInMeta(byte[], byte[],
byte[], boolean, Object) line: 670
HConnectionManager$TableServers.locateRegion(byte[], byte[],
boolean) line: 634
HConnectionManager$TableServers.locateRegion(byte[], byte[]) line: 601
HTable.<init>(HBaseConfiguration, byte[]) line: 134
I've googled a little but no clear answer.
I hope this problem will be very easy to solve.
Thanks in advance for any help.
David
