[jira] [Commented] (HBASE-9644) Regionserver throws java.lang.NoClassDefFoundError: Ljava/lang/InternalError exception while decompressing hfileblock

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

    [ https://issues.apache.org/jira/browse/HBASE-9644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13776171#comment-13776171 ] 

Liang Xie commented on HBASE-9644:
----------------------------------

The "L" of  "Ljava/lang/InternalError" means "class or interface", it's a type signature, not related with snappy:)
                
> 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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