Lars Hofhansl created HBASE-9553:
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Summary: Pad HFile blocks to a fixed size before placing them into
the blockcache
Key: HBASE-9553
URL: https://issues.apache.org/jira/browse/HBASE-9553
Project: HBase
Issue Type: Bug
Reporter: Lars Hofhansl
In order to make it easy on the garbage collector and to avoid full compaction
phases we should make sure that all (or at least a large percentage) of the
HFile blocks as cached in the block cache are exactly the same size.
Currently an HFile block is typically slightly larger than the declared block
size, as the block will accommodate that last KV on the block. The padding
would be a ColumnFamily option. In many cases 100 bytes would probably be a
good value to make all blocks exactly the same size (but of course it depends
on the max size of the KVs).
This does not have to be perfect. The more blocks evicted and replaced in the
block cache are of the exact same size the easier it should be on the GC.
Thoughts?
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