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Posted to common-issues@hadoop.apache.org by "Sangjin Lee (JIRA)" <ji...@apache.org> on 2016/02/05 22:40:39 UTC
[jira] [Updated] (HADOOP-12773) HBase classes fail to load with
client/job classloader enabled
[ https://issues.apache.org/jira/browse/HADOOP-12773?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sangjin Lee updated HADOOP-12773:
---------------------------------
Attachment: HADOOP-12773.01.patch
> HBase classes fail to load with client/job classloader enabled
> --------------------------------------------------------------
>
> Key: HADOOP-12773
> URL: https://issues.apache.org/jira/browse/HADOOP-12773
> Project: Hadoop Common
> Issue Type: Bug
> Components: util
> Affects Versions: 2.6.3
> Reporter: Sangjin Lee
> Assignee: Sangjin Lee
> Attachments: HADOOP-12773.01.patch
>
>
> Currently if a user uses HBase and enables the client/job classloader, the job fails to load HBase classes. For example,
> {noformat}
> java.lang.NoClassDefFoundError: Lorg/apache/hadoop/hbase/client/HBaseAdmin;
> at java.lang.Class.getDeclaredFields0(Native Method)
> at java.lang.Class.privateGetDeclaredFields(Class.java:2509)
> at java.lang.Class.getDeclaredField(Class.java:1959)
> at java.io.ObjectStreamClass.getDeclaredSUID(ObjectStreamClass.java:1703)
> at java.io.ObjectStreamClass.access$700(ObjectStreamClass.java:72)
> at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:484)
> at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:472)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:472)
> at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:369)
> {noformat}
> It is because the HBase classes (org.apache.hadoop.hbase.\*) meet the system classes criteria which are supposed to be loaded strictly from the base classloader. But hadoop does not provide HBase as a dependency.
> We should exclude the HBase classes from the system classes until/unless HBase is provided by a future version of hadoop.
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