3.2. Upgrading from 0.98.x to 1.0.x

In this section we first note the significant changes that come in with 1.0.0 HBase and then we go over the upgrade process. Be sure to read the significant changes section with care so you avoid surprises.

3.2.1. Changes of Note!

In here we list important changes that are in 1.0.0 since 0.98.x., changes you should be aware that will go into effect once you upgrade. ZooKeeper 3.4 is required in HBase 1.0.0

See Section 2.1.2, “ZooKeeper Requirements”. hbase.bucketcache.percentage.in.combinedcache configuration has been REMOVED

You may have made use of this configuration if you are using BucketCache. If NOT using BucketCache, this change does not effect you. Its removal means that your L1 LruBlockCache is now sized using hfile.block.cache.size -- i.e. the way you would size the onheap L1 LruBlockCache if you were NOT doing BucketCache -- and the BucketCache size is not whatever the setting for hbase.bucketcache.size is. You may need to adjust configs to get the LruBlockCache and BucketCache sizes set to what they were in 0.98.x and previous. If you did not set this config., its default value was 0.9. If you do nothing, your BucketCache will increase in size by 10%. Your L1 LruBlockCache will become hfile.block.cache.size times your java heap size (hfile.block.cache.size is a float between 0.0 and 1.0). To read more, see HBASE-11520 Simplify offheap cache config by removing the confusing "hbase.bucketcache.percentage.in.combinedcache".

3.2.2. Rolling upgrade from 0.98.x to HBase 1.0.0


3.2.3. Upgrading to 1.0 from 0.94

You cannot rolling upgrade from 0.94.x to 1.x.x. You must stop your cluster, install the 1.x.x software, run the migration described at Section 3.5.1, “Executing the 0.96 Upgrade” (substituting 1.x.x. wherever we make mention of 0.96.x in the section below), and then restart. Be sure to upgrade your zookeeper if it is a version less than the required 3.4.x.

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