Fix LRU stats message
---------------------
Key: HBASE-4141
URL: https://issues.apache.org/jira/browse/HBASE-4141
Project: HBase
Issue Type: Bug
Components: regionserver
Reporter: Lars George
Priority: Trivial
Currently the DEBUG message looks like this:
{noformat}
2011-07-26 04:21:52,344 DEBUG org.apache.hadoop.hbase.io.hfile.LruBlockCache:
LRU Stats: total=3.24 MB, free=391.76 MB, max=395 MB, blocks=0,
accesses=118458, hits=0, hitRatio=0.00%%, cachingAccesses=0, cachingHits=0,
cachingHitsRatio=�%, evictions=0, evicted=0, evictedPerRun=NaN
{noformat}
Note the double percent on "hitRatio", and the stray character at
"cachingHitsRatio".
The former is a added by the code in LruBlockCache.java:
{code}
...
"hitRatio=" +
(stats.getHitCount() == 0 ? "0" :
(StringUtils.formatPercent(stats.getHitRatio(), 2) + "%, ")) +
...
{code}
The StringUtils already adds a percent sign, so the trailing one here can be
dropped.
The latter I presume is caused by the value not between 0.0 and 1.0. This
should be checked and "NaN" or so displayed instead as is done for other values.
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