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https://issues.apache.org/jira/browse/HBASE-15752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15267859#comment-15267859
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Enis Soztutar commented on HBASE-15752:
---------------------------------------
Thanks Ted. This is the correct approach. However, there is no need for
{{getNonDefaultWALCellCodecClass}}. We can just add the jar of WALCodec to the
dependency jars regardless of whether it is default or not.
> ClassNotFoundException is encountered when custom WAL codec is not found in
> WALPlayer job
> -----------------------------------------------------------------------------------------
>
> Key: HBASE-15752
> URL: https://issues.apache.org/jira/browse/HBASE-15752
> Project: HBase
> Issue Type: Bug
> Reporter: Ted Yu
> Assignee: Ted Yu
> Attachments: 15752.v1.patch
>
>
> [~cartershanklin] reported the following when he tried out back / restore
> feature in a Phoenix enabled deployment:
> {code}
> 2016-05-02 18:57:58,578 FATAL [IPC Server handler 2 on 38194]
> org.apache.hadoop.mapred.TaskAttemptListenerImpl: Task:
> attempt_1462215011294_0001_m_000000_0 - exited : java.io. IOException: Cannot
> get log reader
> at org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:344)
> at org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:266)
> at org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:254)
> at org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:403)
> at
> org.apache.hadoop.hbase.mapreduce.WALInputFormat$WALRecordReader.initialize(WALInputFormat.java:152)
> at
> org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.initialize(MapTask.java:548)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:786)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
> at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:168)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1708)
> at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:162)
> Caused by: java.lang.UnsupportedOperationException: Unable to find
> org.apache.hadoop.hbase.regionserver.wal.IndexedWALEditCodec
> at
> org.apache.hadoop.hbase.util.ReflectionUtils.instantiateWithCustomCtor(ReflectionUtils.java:36)
> at
> org.apache.hadoop.hbase.regionserver.wal.WALCellCodec.create(WALCellCodec.java:103)
> at
> org.apache.hadoop.hbase.regionserver.wal.ProtobufLogReader.getCodec(ProtobufLogReader.java:282)
> at
> org.apache.hadoop.hbase.regionserver.wal.ProtobufLogReader.initAfterCompression(ProtobufLogReader.java:292)
> at
> org.apache.hadoop.hbase.regionserver.wal.ReaderBase.init(ReaderBase.java:82)
> at
> org.apache.hadoop.hbase.regionserver.wal.ProtobufLogReader.init(ProtobufLogReader.java:149)
> at org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:301)
> ... 12 more
> Caused by: java.lang.ClassNotFoundException:
> org.apache.hadoop.hbase.regionserver.wal.IndexedWALEditCodec
> at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:264)
> {code}
> This was due to the IndexedWALEditCodec (specified thru
> hbase.regionserver.wal.codec) used by Phoenix being absent in hadoop
> classpath.
> WALPlayer should handle this situation better by adding the jar for
> IndexedWALEditCodec class to mapreduce job dependency.
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