FAQ
Hi,

Please confirm on this..

1) yesterday I selected default settings for services and Cloudera
Manager installed Datanodes on our edge nodes. on which we don't want
to run our datanodes..later I realized and decommissioned and deleted
datanode services from edge nodes. will it effect anything in the
future like whenever cloudera manger restarts or anything else
happen..we dont want to participate data node services from edge
nodes..

2) Do we need to configure Hbase region server on all cluster nodes.
Please confirm on this.

I am seeing Hbase Region server configuration failed on few
systems..Please advise on this..

Appreciate your help on this.

here is the log:

+ exec /usr/lib/hbase/bin/hbase --config
/var/run/cloudera-scm-agent/process/81-hbase-REGIONSERVER regionserver
start
Exception in thread "regionserver60020" java.lang.NullPointerException
at org.apache.hadoop.hbase.regionserver.HRegionServer.join(HRegionServer.java:1596)
at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:760)
at java.lang.Thread.run(Thread.java:662)


Stdout

Mon Nov 12 17:24:31 PST 2012
using /usr/java/jdk1.6.0_31 as JAVA_HOME
using 4 as CDH_VERSION
using /usr/lib/hbase as HBASE_HOME
using /var/run/cloudera-scm-agent/process/81-hbase-REGIONSERVER as
HBASE_CONF_DIR
using /var/run/cloudera-scm-agent/process/81-hbase-REGIONSERVER as
HADOOP_CONF_DIR
using /usr/lib/hadoop as HADOOP_HOME
Mon Nov 12 17:24:37 PST 2012
using /usr/java/jdk1.6.0_31 as JAVA_HOME
using 4 as CDH_VERSION
using /usr/lib/hbase as HBASE_HOME
using /var/run/cloudera-scm-agent/process/81-hbase-REGIONSERVER as
HBASE_CONF_DIR
using /var/run/cloudera-scm-agent/process/81-hbase-REGIONSERVER as
HADOOP_CONF_DIR
using /usr/lib/hadoop as HADOOP_HOME
Mon Nov 12 17:24:41 PST 2012
using /usr/java/jdk1.6.0_31 as JAVA_HOME
using 4 as CDH_VERSION
using /usr/lib/hbase as HBASE_HOME
using /var/run/cloudera-scm-agent/process/81-hbase-REGIONSERVER as
HBASE_CONF_DIR
using /var/run/cloudera-scm-agent/process/81-hbase-REGIONSERVER as
HADOOP_CONF_DIR
using /usr/lib/hadoop as HADOOP_HOME
Mon Nov 12 17:24:45 PST 2012
using /usr/java/jdk1.6.0_31 as JAVA_HOME
using 4 as CDH_VERSION
using /usr/lib/hbase as HBASE_HOME
using /var/run/cloudera-scm-agent/process/81-hbase-REGIONSERVER as
HBASE_CONF_DIR
using /var/run/cloudera-scm-agent/process/81-hbase-REGIONSERVER as
HADOOP_CONF_DIR
using /usr/lib/hadoop as HADOOP_HOME

Thanks,
Chittu

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  • Joey Echeverria at Nov 14, 2012 at 5:24 pm

    1) yesterday I selected default settings for services and Cloudera
    Manager installed Datanodes on our edge nodes. on which we don't want
    to run our datanodes..later I realized and decommissioned and deleted
    datanode services from edge nodes. will it effect anything in the
    future like whenever cloudera manger restarts or anything else
    happen..we dont want to participate data node services from edge
    nodes..
    Once you've deleted the role from the host, you don't need to worry
    about it coming back automatically.

    2) Do we need to configure Hbase region server on all cluster nodes.
    Please confirm on this.
    You should install the region servers on all nodes where you run a DataNode.

    I am seeing Hbase Region server configuration failed on few
    systems..Please advise on this..

    Appreciate your help on this.

    here is the log:

    + exec /usr/lib/hbase/bin/hbase --config
    /var/run/cloudera-scm-agent/process/81-hbase-REGIONSERVER regionserver
    start
    Exception in thread "regionserver60020" java.lang.NullPointerException
    at org.apache.hadoop.hbase.regionserver.HRegionServer.join(HRegionServer.java:1596)
    at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:760)
    at java.lang.Thread.run(Thread.java:662)
    That's usually caused by a failure in hostname resolution. Can you
    verify that all hosts can resolve the name of the HBase master?

    -Joey

    Stdout

    Mon Nov 12 17:24:31 PST 2012
    using /usr/java/jdk1.6.0_31 as JAVA_HOME
    using 4 as CDH_VERSION
    using /usr/lib/hbase as HBASE_HOME
    using /var/run/cloudera-scm-agent/process/81-hbase-REGIONSERVER as
    HBASE_CONF_DIR
    using /var/run/cloudera-scm-agent/process/81-hbase-REGIONSERVER as
    HADOOP_CONF_DIR
    using /usr/lib/hadoop as HADOOP_HOME
    Mon Nov 12 17:24:37 PST 2012
    using /usr/java/jdk1.6.0_31 as JAVA_HOME
    using 4 as CDH_VERSION
    using /usr/lib/hbase as HBASE_HOME
    using /var/run/cloudera-scm-agent/process/81-hbase-REGIONSERVER as
    HBASE_CONF_DIR
    using /var/run/cloudera-scm-agent/process/81-hbase-REGIONSERVER as
    HADOOP_CONF_DIR
    using /usr/lib/hadoop as HADOOP_HOME
    Mon Nov 12 17:24:41 PST 2012
    using /usr/java/jdk1.6.0_31 as JAVA_HOME
    using 4 as CDH_VERSION
    using /usr/lib/hbase as HBASE_HOME
    using /var/run/cloudera-scm-agent/process/81-hbase-REGIONSERVER as
    HBASE_CONF_DIR
    using /var/run/cloudera-scm-agent/process/81-hbase-REGIONSERVER as
    HADOOP_CONF_DIR
    using /usr/lib/hadoop as HADOOP_HOME
    Mon Nov 12 17:24:45 PST 2012
    using /usr/java/jdk1.6.0_31 as JAVA_HOME
    using 4 as CDH_VERSION
    using /usr/lib/hbase as HBASE_HOME
    using /var/run/cloudera-scm-agent/process/81-hbase-REGIONSERVER as
    HBASE_CONF_DIR
    using /var/run/cloudera-scm-agent/process/81-hbase-REGIONSERVER as
    HADOOP_CONF_DIR
    using /usr/lib/hadoop as HADOOP_HOME

    Thanks,
    Chittu


    --
    Joey Echeverria
    Principal Solutions Architect
    Cloudera, Inc.

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postedNov 13, '12 at 6:33p
activeNov 14, '12 at 5:24p
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