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The "Hbase/Troubleshooting" page has been changed by AndrewPurtell. http://wiki.apache.org/hadoop/Hbase/Troubleshooting?action=diff&rev1=33&rev2=34 -------------------------------------------------- 1. [[#14|Problem: Zookeeper does not seem to work on Amazon EC2]] 1. [[#15|Problem: General operating environment issues -- zookeeper session timeouts, regionservers shutting down, etc.]] 1. [[#16|Problem: Scanner performance is low]] + 1. [[#17|Problem: My shell or client application throws lots of scary exceptions during normal operation]] <<Anchor(1)>> == 1. Problem: Master initializes, but Region Servers do not == @@ -228, +229 @@ == Causes == Various. == Resolution == - * See the [[http://wiki.apache.org/hadoop/ZooKeeper/Troubleshooting ZooKeeper Operating Environment Troubleshooting]] page. It has suggestions and tools for checking disk and networking performance; i.e. the operating environment your zookeeper and hbase are running in. ZooKeeper is the cluster's "canary". It'll be the first to notice issues if any so making sure its happy is the short-cut to a humming cluster. + See the [[http://wiki.apache.org/hadoop/ZooKeeper/Troubleshooting ZooKeeper Operating Environment Troubleshooting]] page. It has suggestions and tools for checking disk and networking performance; i.e. the operating environment your zookeeper and hbase are running in. ZooKeeper is the cluster's "canary". It'll be the first to notice issues if any so making sure its happy is the short-cut to a humming cluster. <<Anchor(16)>> == 16. Problem: Scanner performance is low == @@ -238, +239 @@ * Increase the amount of prefetching on the scanner, to 10, or 100, or 1000, as appropriate for your workload: [[http://hadoop.apache.org/hbase/docs/current/api/org/apache/hadoop/hbase/client/HTable.html#scannerCaching|HTable.scannerCaching]] * This change can be accomplished globally by setting the hbase.client.scanner.caching property in hbase-site.xml to the desired value. + <<Anchor(17)>> + == 17. Problem: My shell or client application throws lots of scary exceptions during normal operation == + == Causes == + Since 0.20.0 the default log level for org.apache.hadoop.hbase.* is DEBUG. + == Resolution == + On your clients, edit $HBASE_HOME/conf/log4j.properties and change this: {{{log4j.logger.org.apache.hadoop.hbase=DEBUG}}} + to this: {{{log4j.logger.org.apache.hadoop.hbase=INFO}}}, or even {{{log4j.logger.org.apache.hadoop.hbase=WARN}}} . +
