[jira] [Created] (HBASE-27986) Null Pointer Exception when running testLruBlockCache with a misconfiguration

["ConfX (Jira)" <ji...@apache.org>]

ConfX created HBASE-27986:
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             Summary: Null Pointer Exception when running testLruBlockCache with a misconfiguration
                 Key: HBASE-27986
                 URL: https://issues.apache.org/jira/browse/HBASE-27986
             Project: HBase
          Issue Type: Bug
            Reporter: ConfX
         Attachments: reproduce.sh

h2. What happened

After setting {{{}hfile.block.cache.size=1.1175870895385742E-8{}}}, running test {{org.apache.hadoop.hbase.io.hfile.TestBlockCacheReporting#testLruBlockCache}} results in a {{{}NullPointerException{}}}.
h2. Where's the bug

In the test {{{}org.apache.hadoop.hbase.io.hfile.TestBlockCacheReporting#testLruBlockCache{}}}:
{code:java}
    BlockCache blockCache = BlockCacheFactory.createBlockCache(this.conf);
    logPerBlock(blockCache);
    addDataAndHits(blockCache, 3); {code}
Here the returned blockCache could be null, but is directly used as the parameter of {{logPerBlock}} without checking.
h2. How to reproduce
 # Set {{hfile.block.cache.size=1.1175870895385742E-8}}
 # Run {{org.apache.hadoop.hbase.io.hfile.TestBlockCacheReporting#testLruBlockCache}}
and the following exception should be observed:

{code:java}
java.lang.NullPointerException	at org.apache.hadoop.hbase.io.hfile.TestBlockCacheReporting.logPerBlock(TestBlockCacheReporting.java:147)	at org.apache.hadoop.hbase.io.hfile.TestBlockCacheReporting.testLruBlockCache(TestBlockCacheReporting.java:100) {code}

{{}}



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