[ 
https://issues.apache.org/jira/browse/HIVE-12167?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Sergey Shelukhin updated HIVE-12167:
------------------------------------
    Description: 
I ran some random test (vectorization_10) with HBase metastore for unrelated 
reason, and I see large number of exceptions in hive.log
{noformat}
$ grep -c "ConnectionLoss" hive.log
52
$ grep -c "Connection refused" hive.log
1014
{noformat}
These log lines' count has increased by ~33% since merging llap branch, but it 
is still high before that (39/~700) for the same test). These lines are not 
present if I disable HBase metastore.
The exceptions are:
{noformat}
2015-10-13T17:51:06,232 WARN  [Thread-359-SendThread(localhost:2181)]: 
zookeeper.ClientCnxn (ClientCnxn.java:run(1102)) - Session 0x0 for server null, 
unexpected error, closing socket connection and attempting reconnect
java.net.ConnectException: Connection refused
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) 
~[?:1.8.0_45]
        at 
sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) 
~[?:1.8.0_45]
        at 
org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
 ~[zookeeper-3.4.6.jar:3.4.6-1569965]
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081) 
[zookeeper-3.4.6.jar:3.4.6-1569965]
{noformat}
that is retried for some seconds and then
{noformat}
2015-10-13T17:51:22,867 WARN  [Thread-359]: zookeeper.ZKUtil 
(ZKUtil.java:checkExists(544)) - hconnection-0x1da6ef180x0, 
quorum=localhost:2181, baseZNode=/hbase Unable to set watcher on znode 
(/hbase/hbaseid)
org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = 
ConnectionLoss for /hbase/hbaseid
        at org.apache.zookeeper.KeeperException.create(KeeperException.java:99) 
~[zookeeper-3.4.6.jar:3.4.6-1569965]
        at org.apache.zookeeper.KeeperException.create(KeeperException.java:51) 
~[zookeeper-3.4.6.jar:3.4.6-1569965]
        at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1045) 
~[zookeeper-3.4.6.jar:3.4.6-1569965]
        at 
org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.exists(RecoverableZooKeeper.java:222)
 ~[hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.zookeeper.ZKUtil.checkExists(ZKUtil.java:541) 
[hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.zookeeper.ZKClusterId.readClusterIdZNode(ZKClusterId.java:65)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ZooKeeperRegistry.getClusterId(ZooKeeperRegistry.java:105)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.retrieveClusterId(ConnectionManager.java:879)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.<init>(ConnectionManager.java:635)
 [hbase-client-1.1.1.jar:1.1.1]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native 
Method) ~[?:1.8.0_45]
        at 
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
 [?:1.8.0_45]
        at 
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
 [?:1.8.0_45]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:422) 
[?:1.8.0_45]
        at 
org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:238)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ConnectionManager.createConnection(ConnectionManager.java:420)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ConnectionManager.createConnectionInternal(ConnectionManager.java:329)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.HConnectionManager.createConnection(HConnectionManager.java:144)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hive.metastore.hbase.VanillaHBaseConnection.connect(VanillaHBaseConnection.java:56)
 [hive-metastore-2.0.0-SNAPSHOT.jar:?]
        at 
org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite.<init>(HBaseReadWrite.java:227)
 [hive-metastore-2.0.0-SNAPSHOT.jar:?]
        at 
org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite.<init>(HBaseReadWrite.java:83)
 [hive-metastore-2.0.0-SNAPSHOT.jar:?]
        at 
org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite$1.initialValue(HBaseReadWrite.java:157)
 [hive-metastore-2.0.0-SNAPSHOT.jar:?]
        at 
org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite$1.initialValue(HBaseReadWrite.java:151)
 [hive-metastore-2.0.0-SNAPSHOT.jar:?]
        at java.lang.ThreadLocal.setInitialValue(ThreadLocal.java:180) 
[?:1.8.0_45]
        at java.lang.ThreadLocal.get(ThreadLocal.java:170) [?:1.8.0_45]
        at 
org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite.getInstance(HBaseReadWrite.java:205)
 [hive-metastore-2.0.0-SNAPSHOT.jar:?]
        at 
org.apache.hadoop.hive.metastore.hbase.StatsCache$Invalidator.run(StatsCache.java:309)
 [hive-metastore-2.0.0-SNAPSHOT.jar:?]
{noformat}
or (note this one is after the connection was already created)
{noformat}
2015-10-13T17:51:58,134 WARN  [Thread-359]: zookeeper.ZKUtil 
(ZKUtil.java:getData(753)) - hconnection-0x1da6ef180x0, quorum=localhost:2181, 
baseZNode=/hbase Unable to get data of znode /hbase/meta-region-server
org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = 
ConnectionLoss for /hbase/meta-region-server
        at org.apache.zookeeper.KeeperException.create(KeeperException.java:99) 
~[zookeeper-3.4.6.jar:3.4.6-1569965]
        at org.apache.zookeeper.KeeperException.create(KeeperException.java:51) 
~[zookeeper-3.4.6.jar:3.4.6-1569965]
        at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1155) 
~[zookeeper-3.4.6.jar:3.4.6-1569965]
        at 
org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.getData(RecoverableZooKeeper.java:360)
 ~[hbase-client-1.1.1.jar:1.1.1]
        at org.apache.hadoop.hbase.zookeeper.ZKUtil.getData(ZKUtil.java:745) 
[hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.zookeeper.MetaTableLocator.getMetaRegionState(MetaTableLocator.java:482)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.zookeeper.MetaTableLocator.getMetaRegionLocation(MetaTableLocator.java:168)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.zookeeper.MetaTableLocator.blockUntilAvailable(MetaTableLocator.java:600)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.zookeeper.MetaTableLocator.blockUntilAvailable(MetaTableLocator.java:580)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.zookeeper.MetaTableLocator.blockUntilAvailable(MetaTableLocator.java:559)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ZooKeeperRegistry.getMetaRegionLocation(ZooKeeperRegistry.java:61)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateMeta(ConnectionManager.java:1185)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1152)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.RpcRetryingCallerWithReadReplicas.getRegionLocations(RpcRetryingCallerWithReadReplicas.java:300)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:153)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:61)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:200)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ClientSmallReversedScanner.loadCache(ClientSmallReversedScanner.java:211)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ClientSmallReversedScanner.next(ClientSmallReversedScanner.java:185)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegionInMeta(ConnectionManager.java:1249)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1155)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.RpcRetryingCallerWithReadReplicas.getRegionLocations(RpcRetryingCallerWithReadReplicas.java:300)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:153)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:61)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:200)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ClientScanner.call(ClientScanner.java:320) 
[hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ClientScanner.nextScanner(ClientScanner.java:295)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ClientScanner.initializeScannerInConstruction(ClientScanner.java:160)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ClientScanner.<init>(ClientScanner.java:155) 
[hbase-client-1.1.1.jar:1.1.1]
        at org.apache.hadoop.hbase.client.HTable.getScanner(HTable.java:811) 
[hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite.scan(HBaseReadWrite.java:2046)
 [hive-metastore-2.0.0-SNAPSHOT.jar:?]
        at 
org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite.scan(HBaseReadWrite.java:2027)
 [hive-metastore-2.0.0-SNAPSHOT.jar:?]
        at 
org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite.invalidateAggregatedStats(HBaseReadWrite.java:1707)
 [hive-metastore-2.0.0-SNAPSHOT.jar:?]
        at 
org.apache.hadoop.hive.metastore.hbase.StatsCache$Invalidator.run(StatsCache.java:309)
 [hive-metastore-2.0.0-SNAPSHOT.jar:?]
{noformat}

  was:
I ran some random test (vectorization_10) with HBase metastore for unrelated 
reason, and I see large number of exceptions in hive.log
{noformat}
$ grep -c "ConnectionLoss" hive.log
52
$ grep -c "Connection refused" hive.log
1014
{noformat}
These log lines' count has increased by ~33% since merging llap branch, but it 
is still high before that (39/~700) for the same test). These lines are not 
present if I disable HBase metastore.
The exceptions are:
{noformat}
2015-10-13T17:51:06,232 WARN  [Thread-359-SendThread(localhost:2181)]: 
zookeeper.ClientCnxn (ClientCnxn.java:run(1102)) - Session 0x0 for server null, 
unexpected error, closing socket connection and attempting reconnect
java.net.ConnectException: Connection refused
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) 
~[?:1.8.0_45]
        at 
sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) 
~[?:1.8.0_45]
        at 
org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
 ~[zookeeper-3.4.6.jar:3.4.6-1569965]
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081) 
[zookeeper-3.4.6.jar:3.4.6-1569965]
{noformat}
that is retried for some seconds and then
{noformat}
2015-10-13T17:51:22,867 WARN  [Thread-359]: zookeeper.ZKUtil 
(ZKUtil.java:checkExists(544)) - hconnection-0x1da6ef180x0, 
quorum=localhost:2181, baseZNode=/hbase Unable to set watcher on znode 
(/hbase/hbaseid)
org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = 
ConnectionLoss for /hbase/hbaseid
        at org.apache.zookeeper.KeeperException.create(KeeperException.java:99) 
~[zookeeper-3.4.6.jar:3.4.6-1569965]
        at org.apache.zookeeper.KeeperException.create(KeeperException.java:51) 
~[zookeeper-3.4.6.jar:3.4.6-1569965]
        at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1045) 
~[zookeeper-3.4.6.jar:3.4.6-1569965]
        at 
org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.exists(RecoverableZooKeeper.java:222)
 ~[hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.zookeeper.ZKUtil.checkExists(ZKUtil.java:541) 
[hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.zookeeper.ZKClusterId.readClusterIdZNode(ZKClusterId.java:65)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ZooKeeperRegistry.getClusterId(ZooKeeperRegistry.java:105)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.retrieveClusterId(ConnectionManager.java:879)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.<init>(ConnectionManager.java:635)
 [hbase-client-1.1.1.jar:1.1.1]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native 
Method) ~[?:1.8.0_45]
        at 
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
 [?:1.8.0_45]
        at 
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
 [?:1.8.0_45]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:422) 
[?:1.8.0_45]
        at 
org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:238)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ConnectionManager.createConnection(ConnectionManager.java:420)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.ConnectionManager.createConnectionInternal(ConnectionManager.java:329)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hbase.client.HConnectionManager.createConnection(HConnectionManager.java:144)
 [hbase-client-1.1.1.jar:1.1.1]
        at 
org.apache.hadoop.hive.metastore.hbase.VanillaHBaseConnection.connect(VanillaHBaseConnection.java:56)
 [hive-metastore-2.0.0-SNAPSHOT.jar:?]
        at 
org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite.<init>(HBaseReadWrite.java:227)
 [hive-metastore-2.0.0-SNAPSHOT.jar:?]
        at 
org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite.<init>(HBaseReadWrite.java:83)
 [hive-metastore-2.0.0-SNAPSHOT.jar:?]
        at 
org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite$1.initialValue(HBaseReadWrite.java:157)
 [hive-metastore-2.0.0-SNAPSHOT.jar:?]
        at 
org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite$1.initialValue(HBaseReadWrite.java:151)
 [hive-metastore-2.0.0-SNAPSHOT.jar:?]
        at java.lang.ThreadLocal.setInitialValue(ThreadLocal.java:180) 
[?:1.8.0_45]
        at java.lang.ThreadLocal.get(ThreadLocal.java:170) [?:1.8.0_45]
        at 
org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite.getInstance(HBaseReadWrite.java:205)
 [hive-metastore-2.0.0-SNAPSHOT.jar:?]
        at 
org.apache.hadoop.hive.metastore.hbase.StatsCache$Invalidator.run(StatsCache.java:309)
 [hive-metastore-2.0.0-SNAPSHOT.jar:?]
{noformat}



> HBase metastore causes massive number of ZK exceptions in MiniTez tests
> -----------------------------------------------------------------------
>
>                 Key: HIVE-12167
>                 URL: https://issues.apache.org/jira/browse/HIVE-12167
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>            Assignee: Daniel Dai
>
> I ran some random test (vectorization_10) with HBase metastore for unrelated 
> reason, and I see large number of exceptions in hive.log
> {noformat}
> $ grep -c "ConnectionLoss" hive.log
> 52
> $ grep -c "Connection refused" hive.log
> 1014
> {noformat}
> These log lines' count has increased by ~33% since merging llap branch, but 
> it is still high before that (39/~700) for the same test). These lines are 
> not present if I disable HBase metastore.
> The exceptions are:
> {noformat}
> 2015-10-13T17:51:06,232 WARN  [Thread-359-SendThread(localhost:2181)]: 
> zookeeper.ClientCnxn (ClientCnxn.java:run(1102)) - Session 0x0 for server 
> null, unexpected error, closing socket connection and attempting reconnect
> java.net.ConnectException: Connection refused
>       at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) 
> ~[?:1.8.0_45]
>       at 
> sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) 
> ~[?:1.8.0_45]
>       at 
> org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
>  ~[zookeeper-3.4.6.jar:3.4.6-1569965]
>       at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081) 
> [zookeeper-3.4.6.jar:3.4.6-1569965]
> {noformat}
> that is retried for some seconds and then
> {noformat}
> 2015-10-13T17:51:22,867 WARN  [Thread-359]: zookeeper.ZKUtil 
> (ZKUtil.java:checkExists(544)) - hconnection-0x1da6ef180x0, 
> quorum=localhost:2181, baseZNode=/hbase Unable to set watcher on znode 
> (/hbase/hbaseid)
> org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode 
> = ConnectionLoss for /hbase/hbaseid
>       at org.apache.zookeeper.KeeperException.create(KeeperException.java:99) 
> ~[zookeeper-3.4.6.jar:3.4.6-1569965]
>       at org.apache.zookeeper.KeeperException.create(KeeperException.java:51) 
> ~[zookeeper-3.4.6.jar:3.4.6-1569965]
>       at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1045) 
> ~[zookeeper-3.4.6.jar:3.4.6-1569965]
>       at 
> org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.exists(RecoverableZooKeeper.java:222)
>  ~[hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.zookeeper.ZKUtil.checkExists(ZKUtil.java:541) 
> [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.zookeeper.ZKClusterId.readClusterIdZNode(ZKClusterId.java:65)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ZooKeeperRegistry.getClusterId(ZooKeeperRegistry.java:105)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.retrieveClusterId(ConnectionManager.java:879)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.<init>(ConnectionManager.java:635)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native 
> Method) ~[?:1.8.0_45]
>       at 
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
>  [?:1.8.0_45]
>       at 
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
>  [?:1.8.0_45]
>       at java.lang.reflect.Constructor.newInstance(Constructor.java:422) 
> [?:1.8.0_45]
>       at 
> org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(ConnectionFactory.java:238)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ConnectionManager.createConnection(ConnectionManager.java:420)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ConnectionManager.createConnectionInternal(ConnectionManager.java:329)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.HConnectionManager.createConnection(HConnectionManager.java:144)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hive.metastore.hbase.VanillaHBaseConnection.connect(VanillaHBaseConnection.java:56)
>  [hive-metastore-2.0.0-SNAPSHOT.jar:?]
>       at 
> org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite.<init>(HBaseReadWrite.java:227)
>  [hive-metastore-2.0.0-SNAPSHOT.jar:?]
>       at 
> org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite.<init>(HBaseReadWrite.java:83)
>  [hive-metastore-2.0.0-SNAPSHOT.jar:?]
>       at 
> org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite$1.initialValue(HBaseReadWrite.java:157)
>  [hive-metastore-2.0.0-SNAPSHOT.jar:?]
>       at 
> org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite$1.initialValue(HBaseReadWrite.java:151)
>  [hive-metastore-2.0.0-SNAPSHOT.jar:?]
>       at java.lang.ThreadLocal.setInitialValue(ThreadLocal.java:180) 
> [?:1.8.0_45]
>       at java.lang.ThreadLocal.get(ThreadLocal.java:170) [?:1.8.0_45]
>       at 
> org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite.getInstance(HBaseReadWrite.java:205)
>  [hive-metastore-2.0.0-SNAPSHOT.jar:?]
>       at 
> org.apache.hadoop.hive.metastore.hbase.StatsCache$Invalidator.run(StatsCache.java:309)
>  [hive-metastore-2.0.0-SNAPSHOT.jar:?]
> {noformat}
> or (note this one is after the connection was already created)
> {noformat}
> 2015-10-13T17:51:58,134 WARN  [Thread-359]: zookeeper.ZKUtil 
> (ZKUtil.java:getData(753)) - hconnection-0x1da6ef180x0, 
> quorum=localhost:2181, baseZNode=/hbase Unable to get data of znode 
> /hbase/meta-region-server
> org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode 
> = ConnectionLoss for /hbase/meta-region-server
>       at org.apache.zookeeper.KeeperException.create(KeeperException.java:99) 
> ~[zookeeper-3.4.6.jar:3.4.6-1569965]
>       at org.apache.zookeeper.KeeperException.create(KeeperException.java:51) 
> ~[zookeeper-3.4.6.jar:3.4.6-1569965]
>       at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1155) 
> ~[zookeeper-3.4.6.jar:3.4.6-1569965]
>       at 
> org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.getData(RecoverableZooKeeper.java:360)
>  ~[hbase-client-1.1.1.jar:1.1.1]
>       at org.apache.hadoop.hbase.zookeeper.ZKUtil.getData(ZKUtil.java:745) 
> [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.zookeeper.MetaTableLocator.getMetaRegionState(MetaTableLocator.java:482)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.zookeeper.MetaTableLocator.getMetaRegionLocation(MetaTableLocator.java:168)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.zookeeper.MetaTableLocator.blockUntilAvailable(MetaTableLocator.java:600)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.zookeeper.MetaTableLocator.blockUntilAvailable(MetaTableLocator.java:580)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.zookeeper.MetaTableLocator.blockUntilAvailable(MetaTableLocator.java:559)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ZooKeeperRegistry.getMetaRegionLocation(ZooKeeperRegistry.java:61)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateMeta(ConnectionManager.java:1185)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1152)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.RpcRetryingCallerWithReadReplicas.getRegionLocations(RpcRetryingCallerWithReadReplicas.java:300)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:153)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:61)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:200)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ClientSmallReversedScanner.loadCache(ClientSmallReversedScanner.java:211)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ClientSmallReversedScanner.next(ClientSmallReversedScanner.java:185)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegionInMeta(ConnectionManager.java:1249)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1155)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.RpcRetryingCallerWithReadReplicas.getRegionLocations(RpcRetryingCallerWithReadReplicas.java:300)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:153)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:61)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:200)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ClientScanner.call(ClientScanner.java:320) 
> [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ClientScanner.nextScanner(ClientScanner.java:295)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ClientScanner.initializeScannerInConstruction(ClientScanner.java:160)
>  [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hbase.client.ClientScanner.<init>(ClientScanner.java:155) 
> [hbase-client-1.1.1.jar:1.1.1]
>       at org.apache.hadoop.hbase.client.HTable.getScanner(HTable.java:811) 
> [hbase-client-1.1.1.jar:1.1.1]
>       at 
> org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite.scan(HBaseReadWrite.java:2046)
>  [hive-metastore-2.0.0-SNAPSHOT.jar:?]
>       at 
> org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite.scan(HBaseReadWrite.java:2027)
>  [hive-metastore-2.0.0-SNAPSHOT.jar:?]
>       at 
> org.apache.hadoop.hive.metastore.hbase.HBaseReadWrite.invalidateAggregatedStats(HBaseReadWrite.java:1707)
>  [hive-metastore-2.0.0-SNAPSHOT.jar:?]
>       at 
> org.apache.hadoop.hive.metastore.hbase.StatsCache$Invalidator.run(StatsCache.java:309)
>  [hive-metastore-2.0.0-SNAPSHOT.jar:?]
> {noformat}



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