[HBASE-19148] Reevaluate default values of configurations - ASF JIRA

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Release Note:

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Removed unused hbase.fs.tmp.dir from hbase-default.xml.

Upped hbase.master.fileSplitTimeout from 30s to 10minutes (suggested by production experience)

Added note that handler-count should be ~CPU count.

hbase.regionserver.logroll.multiplier has been changed from 0.95 to 0.5 AND the default block size has been doubled.

A few of the core configs are now dumped to the log on startup.

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Removed unused hbase.fs.tmp.dir from hbase-default.xml. Upped hbase.master.fileSplitTimeout from 30s to 10minutes (suggested by production experience) Added note that handler-count should be ~CPU count. hbase.regionserver.logroll.multiplier has been changed from 0.95 to 0.5 AND the default block size has been doubled. A few of the core configs are now dumped to the log on startup.

Remove cruft and mythologies. Make descriptions more digestible. Change defaults given experience.

relates to

HBASE-19282 CellChunkMap Benchmarking and User Interface

HBASE-16499 slow replication for small HBase clusters

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Review Board (master)

1.	Revisit the default config of hbase client retries number	Resolved	Guanghao Zhang
2.	Figure how to enable compression by default (fallbacks if native is missing, etc.)	Open	Unassigned
3.	Reduce the default hbase.client.start.log.errors.counter	Resolved	Guanghao Zhang
4.	Failed effort upping default HDFS blocksize, hbase.regionserver.hlog.blocksize	Resolved	stack