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HBase

Apache Ozone supports integration with Apache HBase, allowing you to use Ozone as the underlying storage layer for HBase tables. This integration leverages the ofs:// scheme to provide a scalable and robust filesystem for HBase Region Servers.

Prerequisites​

  • An active Apache Ozone cluster.
  • Ozone must be configured to use Ratis replication. HBase does not currently support Erasure Coded (EC) buckets.

Configuration Steps​

1. Ozone Setup​

Before configuring HBase, you must prepare the Ozone filesystem:

  • Create Volume and Bucket: Create a dedicated volume and bucket for HBase. Ensure the bucket is File System Optimized (FSO).
  • Permissions: If using Apache Ranger, grant the hbase user READ/WRITE permissions for the specific Ozone volume and bucket.

2. Ozone Service Configurations​

Update your ozone-site.xml (or via your cluster management tool) with the following properties to enable HBase compatibility:

PropertyValueDescription
ozone.fs.hsync.enabledtrueRequired for HBase WAL (Write Ahead Log) durability.
ozone.hbase.enhancements.allowedtrueEnables Ozone-side optimizations for HBase.
ozone.client.hbase.enhancements.allowedtrueEnables client-side optimizations.
ozone.client.stream.putblock.piggybackingtrueImproves performance for small writes.
ozone.client.incremental.chunk.listtrueOptimizes metadata handling for HBase.

3. HBase Service Configurations​

Configure HBase to point to the Ozone filesystem. Update hbase-site.xml with the following:

  • Root Directory: Set hbase.rootdir to your Ozone path using the ofs:// scheme.

    <property>
      <name>hbase.rootdir</name>
      <value>ofs://[service-id]/[volume]/[bucket]/hbase</value>
    </property>

  • Scheme Support: Note that only ofs:// is supported. The older o3fs:// scheme is not supported for HBase integration.

Now you are ready to start your HBase cluster with Ozone.

Support Matrix and Restrictions​

Unsupported Features​

The following features are currently not supported when running HBase on Ozone:

  • HBase Features: Medium Object Storage (MOB), Favored Nodes, Hedged Read, Storage Policy, and Short Circuit Read.
  • Ozone Features: Snapshots, Erasure Coded (EC) buckets, and Object Store (OBS) buckets.
  • Phoenix: Phoenix User Defined Functions (UDF) are not supported on Ozone.