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README.md

HBase Server

Introduction

This project provides HBase server-side code such as coprocessors.

Coprocessors

Enrichment Coprocessor

Properties

Below is the list of properties to configure the HBase enrichment coprocessor org.apache.metron.hbase.coprocessor.EnrichmentCoprocessor for writing to HBase. These configuration properties all pulled from the global config.

enrichment.list.hhase.provider.impl

Provider to use for obtaining the HBase table. This class implementation implements TableProvider and provides access to an HTableInterface. Defaults to org.apache.metron.hbase.HTableProvider.

enrichment.list.hbase.table

HBase table name for the enrichments list. Defaults to enrichment_list.

enrichment.list.hbase.cf

HBase table column family for the enrichments list. Defaults to t.

Debugging

If you have trouble with a RegionServer failing to start due to a coprocessor problem, e.g.

2019-08-13 14:37:40,793 ERROR [RS_OPEN_REGION-regionserver/node1:16020-0] regionserver.HRegionServer: ***** ABORTING region server node1,16020,1565707051425: The coprocessor org.apache.metron.hbase.coprocessor.EnrichmentCoprocessor threw...

you may need to temporarily disable coprocessor loading while you fix the issue.

Disabling coprocessor loading

  • Navigate to HBase > Config in Ambari
  • Expand the Custom hbase-site subpanel
  • Add the property "hbase.coprocessor.enabled" and set it to false. Note: you can also use the property hbase.coprocessor.user.enabled instead. From the HBase documentation:

    Enables or disables user (aka. table) coprocessor loading. If 'false' (disabled), any table coprocessor attributes in table descriptors will be ignored. If "hbase.coprocessor.enabled" is 'false' this setting has no effect.

  • Restart the HBase regionservers. You should notice a similar message to the following in your regionserver logs. 
    2019-08-13 15:49:18,859 INFO  [regionserver/node1:16020] regionserver.RegionServerCoprocessorHost: System coprocessor loading is disabled
2019-08-13 15:49:18,859 INFO  [regionserver/node1:16020] regionserver.RegionServerCoprocessorHost: Table coprocessor loading is disabled
  • HBase should now start successfully

Reference