[jira] Commented: (HBASE-1229) Apply HADOOP-5369 to HBase MapFile

["stack (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-1229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12679720#action_12679720 ] 

stack commented on HBASE-1229:
------------------------------

Here's the issue:

2009-03-06 12:45:19,289 ERROR [main] master.HMaster(267): bootstrap
org.apache.hadoop.hbase.DroppedSnapshotException: region: -ROOT-,,0
        at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:896)
        at org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:433)
        at org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:364)
        at org.apache.hadoop.hbase.master.HMaster.bootstrap(HMaster.java:261)
        at org.apache.hadoop.hbase.master.HMaster.<init>(HMaster.java:216)
        at org.apache.hadoop.hbase.master.HMaster.<init>(HMaster.java:156)
        at org.apache.hadoop.hbase.LocalHBaseCluster.<init>(LocalHBaseCluster.java:96)
        at org.apache.hadoop.hbase.MiniHBaseCluster.init(MiniHBaseCluster.java:57)
        at org.apache.hadoop.hbase.MiniHBaseCluster.<init>(MiniHBaseCluster.java:51)
        at org.apache.hadoop.hbase.HBaseClusterTestCase.hBaseClusterSetup(HBaseClusterTestCase.java:88)
        at org.apache.hadoop.hbase.HBaseClusterTestCase.setUp(HBaseClusterTestCase.java:125)
        at junit.framework.TestCase.runBare(TestCase.java:125)
        at junit.framework.TestResult$1.protect(TestResult.java:106)
        at junit.framework.TestResult.runProtected(TestResult.java:124)
        at junit.framework.TestResult.run(TestResult.java:109)
        at junit.framework.TestCase.run(TestCase.java:118)
        at junit.framework.TestSuite.runTest(TestSuite.java:208)
        at junit.framework.TestSuite.run(TestSuite.java:203)
        at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:421)
        at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:912)
        at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:766)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 0
        at org.apache.hadoop.hbase.io.MapFile$Reader.midKey(MapFile.java:399)
        at org.apache.hadoop.hbase.io.HBaseMapFile$HBaseReader.<init>(HBaseMapFile.java:87)
        at org.apache.hadoop.hbase.io.BloomFilterMapFile$Reader.<init>(BloomFilterMapFile.java:68)
        at org.apache.hadoop.hbase.regionserver.HStoreFile.getReader(HStoreFile.java:443)
        at org.apache.hadoop.hbase.regionserver.HStore.updateReaders(HStore.java:720)
        at org.apache.hadoop.hbase.regionserver.HStore.internalFlushCache(HStore.java:694)
        at org.apache.hadoop.hbase.regionserver.HStore.flushCache(HStore.java:630)
        at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:881)
        ... 20 more

> Apply HADOOP-5369 to HBase MapFile
> ----------------------------------
>
>                 Key: HBASE-1229
>                 URL: https://issues.apache.org/jira/browse/HBASE-1229
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: Ben Maurer
>            Assignee: Ben Maurer
>             Fix For: 0.19.1
>
>         Attachments: 1229.patch
>
>
> The patch in HADOOP-5369 reduces the memory overhead of mapfile indexes -- especially when block compression is used. It should be applied to the hbase copy of MapFile.

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