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Date: Tue, 4 May 2010 20:08:02 -0400 (EDT)
From: "Benoit Sigoure (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Created: (HBASE-2514) RegionServer should refuse to be
 assigned a region that use LZO when LZO isn't available
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RegionServer should refuse to be assigned a region that use LZO when LZO isn't available
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                 Key: HBASE-2514
                 URL: https://issues.apache.org/jira/browse/HBASE-2514
             Project: Hadoop HBase
          Issue Type: Bug
            Reporter: Benoit Sigoure


If a RegionServer is assigned a region that uses LZO but the required libraries aren't installed on that RegionServer, the server will fail unexpectedly after throwing a {{java.lang.ClassNotFoundException: com.hadoop.compression.lzo.LzoCodec}}

{code}

2010-05-04 16:57:27,258 FATAL org.apache.hadoop.hbase.regionserver.MemStoreFlusher: Replay of hlog required. Forcing server shutdown
org.apache.hadoop.hbase.DroppedSnapshotException: region: tsdb,,1273011287339
        at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:994)
        at org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:887)
        at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:255)
        at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.run(MemStoreFlusher.java:142)
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: com.hadoop.compression.lzo.LzoCodec
        at org.apache.hadoop.hbase.io.hfile.Compression$Algorithm$1.getCodec(Compression.java:91)
        at org.apache.hadoop.hbase.io.hfile.Compression$Algorithm.getCompressor(Compression.java:196)
        at org.apache.hadoop.hbase.io.hfile.HFile$Writer.getCompressingStream(HFile.java:388)
        at org.apache.hadoop.hbase.io.hfile.HFile$Writer.newBlock(HFile.java:374)
        at org.apache.hadoop.hbase.io.hfile.HFile$Writer.checkBlockBoundary(HFile.java:345)
        at org.apache.hadoop.hbase.io.hfile.HFile$Writer.append(HFile.java:517)
        at org.apache.hadoop.hbase.io.hfile.HFile$Writer.append(HFile.java:482)
        at org.apache.hadoop.hbase.regionserver.Store.internalFlushCache(Store.java:558)
        at org.apache.hadoop.hbase.regionserver.Store.flushCache(Store.java:522)
        at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:979)
        ... 3 more
Caused by: java.lang.ClassNotFoundException: com.hadoop.compression.lzo.LzoCodec
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:315)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:330)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
        at org.apache.hadoop.hbase.io.hfile.Compression$Algorithm$1.getCodec(Compression.java:87)
        ... 12 more
{code}

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