Improvements to prewarm META cache on clients
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Key: HBASE-2468
URL: https://issues.apache.org/jira/browse/HBASE-2468
Project: Hadoop HBase
Issue Type: Improvement
Components: client
Reporter: Todd Lipcon
Fix For: 0.20.5
A couple different use cases cause storms of reads to META during startup. For
example, a large MR job will cause each map task to hit meta since it starts
with an empty cache.
A couple possible improvements have been proposed:
- MR jobs could ship a copy of META for the table in the DistributedCache
- Clients could prewarm cache by doing a large scan of all the meta for the
table instead of random reads for each miss
- Each miss could fetch ahead some number of rows in META
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