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Date: Sat, 3 Dec 2011 21:20:39 +0000 (UTC)
From: "Ted Yu (Created) (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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 <2103263862.37808.1322947239925.JavaMail.tomcat@hel.zones.apache.org>
Subject: [jira] [Created] (HBASE-4942) HMaster is unable to start of HFile
 V1 is used
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HMaster is unable to start of HFile V1 is used
----------------------------------------------

                 Key: HBASE-4942
                 URL: https://issues.apache.org/jira/browse/HBASE-4942
             Project: HBase
          Issue Type: Bug
          Components: io
    Affects Versions: 0.92.0
            Reporter: Ted Yu
             Fix For: 0.92.0, 0.94.0


This was reported by HH Zhu (zhh200910@gmail.com)
If the following is specified in hbase-site.xml=EF=BC=9A
{code}
    <property>
        <name>hfile.format.version</name>
        <value>1</value>
    </property>
{code}
Clear the hdfs directory "hbase.rootdir" so that MasterFileSystem.bootstrap=
() is executed.
You would see:
{code}
java.lang.NullPointerException
    at org.apache.hadoop.hbase.io.hfile.HFileReaderV1.close(HFileReaderV1.j=
ava:358)
    at org.apache.hadoop.hbase.regionserver.StoreFile$Reader.close(StoreFil=
e.java:1083)
    at org.apache.hadoop.hbase.regionserver.StoreFile.closeReader(StoreFile=
.java:570)
    at org.apache.hadoop.hbase.regionserver.Store.close(Store.java:441)
    at org.apache.hadoop.hbase.regionserver.HRegion.doClose(HRegion.java:78=
2)
    at org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:717)
    at org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:688)
    at org.apache.hadoop.hbase.master.MasterFileSystem.bootstrap(MasterFile=
System.java:390)
    at org.apache.hadoop.hbase.master.MasterFileSystem.checkRootDir(MasterF=
ileSystem.java:356)
    at org.apache.hadoop.hbase.master.MasterFileSystem.createInitialFileSys=
temLayout(MasterFileSystem.java:128)
    at org.apache.hadoop.hbase.master.MasterFileSystem.<init>(MasterFileSys=
tem.java:113)
    at org.apache.hadoop.hbase.master.HMaster.finishInitialization(HMaster.=
java:435)
    at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:314)
    at java.lang.Thread.run(Thread.java:619)
{code}
The above exception would lead to:
{code}
java.lang.RuntimeException: HMaster Aborted
    at org.apache.hadoop.hbase.master.HMasterCommandLine.startMaster(HMaste=
rCommandLine.java:152)
    at org.apache.hadoop.hbase.master.HMasterCommandLine.run(HMasterCommand=
Line.java:103)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
    at org.apache.hadoop.hbase.util.ServerCommandLine.doMain(ServerCommandL=
ine.java:76)
    at org.apache.hadoop.hbase.master.HMaster.main(HMaster.java:1512)
{code}

In org.apache.hadoop.hbase.master.HMaster.HMaster(Configuration conf), we h=
ave:
{code}
this.conf.setFloat(CacheConfig.HFILE_BLOCK_CACHE_SIZE_KEY, 0.0f);
{code}
When CacheConfig is instantiated, the following is called:
{code}
org.apache.hadoop.hbase.io.hfile.CacheConfig.instantiateBlockCache(Configur=
ation conf)
{code}
Since "hfile.block.cache.size" is 0.0, instantiateBlockCache() would return=
 null, resulting in blockCache field of CacheConfig to be null.
When master closes Root region, org.apache.hadoop.hbase.io.hfile.HFileReade=
rV1.close(boolean evictOnClose) would be called. cacheConf.getBlockCache() =
returns null, leading to master abort.

The following should be called in HFileReaderV1.close(), similar to the cod=
e in HFileReaderV2.close():
{code}
if (evictOnClose && cacheConf.isBlockCacheEnabled())
{code}

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