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https://issues.apache.org/jira/browse/HBASE-9644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13776176#comment-13776176
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Liang Xie commented on HBASE-9644:
----------------------------------
bq. "why hbase checksum cannot find this problem while hdfs can?"
IIRC, it has a fall back mechanism in hbase's checksum impl, that means if
failed in hbase, and will resort to hdfs's checksum, but it should be able to
print some warning log, probably need to double-check the log code. btw, you
never saw any weird checksum log in hbase's logfile, right?
> Regionserver throws java.lang.NoClassDefFoundError: Ljava/lang/InternalError
> exception while decompressing hfileblock
> ---------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-9644
> URL: https://issues.apache.org/jira/browse/HBASE-9644
> Project: HBase
> Issue Type: Bug
> Components: HFile, regionserver
> Affects Versions: 0.94.10
> Environment: Linux 2.6.32-el5.x86_64
> Reporter: Victor Xu
>
> Regionserver threw a "java.lang.NoClassDefFoundError:
> Ljava/lang/InternalError" Exception when it decompressed a hfileblock.
> The exception detail is:
> 2013-09-15 05:44:03,612 ERROR
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> java.lang.NoClassDefFoundError: Ljava/lang/InternalError
> at
> org.apache.hadoop.io.compress.snappy.SnappyDecompressor.decompressBytesDirect(Native
> Method)
> at
> org.apache.hadoop.io.compress.snappy.SnappyDecompressor.decompress(SnappyDecompressor.java:238)
> at
> org.apache.hadoop.io.compress.BlockDecompressorStream.decompress(BlockDecompressorStream.java:87)
> at
> org.apache.hadoop.io.compress.DecompressorStream.read(DecompressorStream.java:83)
> at java.io.BufferedInputStream.read1(BufferedInputStream.java:256)
> at java.io.BufferedInputStream.read(BufferedInputStream.java:317)
> at org.apache.hadoop.io.IOUtils.readFully(IOUtils.java:192)
> at
> org.apache.hadoop.hbase.io.hfile.HFileBlock$AbstractFSReader.decompress(HFileBlock.java:1461)
> at
> org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderV2.readBlockDataInternal(HFileBlock.java:1890)
> at
> org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderV2.readBlockData(HFileBlock.java:1703)
> at
> org.apache.hadoop.hbase.io.hfile.HFileReaderV2.readBlock(HFileReaderV2.java:342)
> at
> org.apache.hadoop.hbase.io.hfile.HFileBlockIndex$BlockIndexReader.loadDataBlockWithScanInfo(HFileBlockIndex.java:254)
> at
> org.apache.hadoop.hbase.io.hfile.HFileReaderV2$AbstractScannerV2.seekTo(HFileReaderV2.java:484)
> at
> org.apache.hadoop.hbase.io.hfile.HFileReaderV2$AbstractScannerV2.seekTo(HFileReaderV2.java:505)
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.seekAtOrAfter(StoreFileScanner.java:220)
> at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.seek(StoreFileScanner.java:140)
> at
> org.apache.hadoop.hbase.regionserver.StoreScanner.<init>(StoreScanner.java:131)
> at
> org.apache.hadoop.hbase.regionserver.Store.getScanner(Store.java:2208)
> at
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.<init>(HRegion.java:3807)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.instantiateRegionScanner(HRegion.java:1825)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1817)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1794)
> at org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:4828)
> at org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:4802)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.get(HRegionServer.java:2196)
> at sun.reflect.GeneratedMethodAccessor48.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.apache.hadoop.hbase.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:320)
> at
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1426)
> Caused by: java.lang.ClassNotFoundException: Ljava.lang.InternalError
> at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> ... 30 more
> There are two problems here:
> 1. Why use the class name 'Ljava/lang/InternalError' instead of
> 'java/lang/InternalError' in Snappy library?
> This involves the code of snappy lib, maybe there is a bug in it.
> 2. When I tried to read the hfileblock using HDFS tools, it told me that the
> local hfileblock didn't pass the file checksum and read another replica from
> remote datanode. Then here is the question, why hbase checksum cannot find
> this problem while hdfs can?
> This is my hbase-site.xml configure for checksum:
> <property>
> <name>dfs.client.read.shortcircuit</name>
> <value>true</value>
> <description></description>
> </property>
> <property>
> <name>dfs.client.read.shortcircuit.skip.checksum</name>
> <value>true</value>
> <description></description>
> </property>
> <property>
> <name>hbase.regionserver.checksum.verify</name>
> <value>true</value>
> <description></description>
> </property>
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