Occasionally, I see the following exception in the log. The severity of this
is 'WARN', so I am not sure if my MapReduce job is successful. Can this
message be ignored? Sounds 'SEVERE' to me.
Note: I am running over 15000 jobs sequentially. This happens occasionally
after about 8000 jobs are processed, so it's a bit hard to debug.
I guess, I could look at the source code, and see what this message means. But
I am being lazy :) Thanks in advance for your advice.
09/10/11 22:33:03 WARN zookeeper.ZooKeeperWrapper: Failed to create /hbase --
check quorum servers,
currently=localhost:2181org.apache.zookeeper.KeeperException$SessionExpiredException:
KeeperErrorCode = Session expired for /hbase at
org.apache.zookeeper.KeeperException.create(KeeperException.java:118)
at org.apache.zookeeper.KeeperException.create(KeeperException.java:42)
at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:522) at
org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.ensureExists(ZooKeeperWrapper.java:342)
at
org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.ensureParentExists(ZooKeeperWrapper.java:365)
at
org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.checkOutOfSafeMode(ZooKeeperWrapper.java:478)
at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRootRegion(HConnectionManager.java:903)
at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:573)
at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:549)
at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:623)
at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:582)
at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:549)
at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:623)
at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:586)
at
org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:549)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:125)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:103)
