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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16189) [Rolling Upgrade] 2.0 hfiles cannot be opened by 1.x servers
Date Wed, 07 Dec 2016 09:55:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15728315#comment-15728315
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Anoop Sam John commented on HBASE-16189:
----------------------------------------

This issue came up again in the dev@ discussion thread.  We fixed this in later versions of
1.x means when rolling upgrade done to 2.0, first users have to upgrade to some 1.x versions
which is having this fix and then to 2.0..   What do you guys think? Whether we should avoid
this kind of indirection?  
cc [~enis], [~saint.ack@gmail.com], [~tedyu], [~mbertozzi]

> [Rolling Upgrade] 2.0 hfiles cannot be opened by 1.x servers
> ------------------------------------------------------------
>
>                 Key: HBASE-16189
>                 URL: https://issues.apache.org/jira/browse/HBASE-16189
>             Project: HBase
>          Issue Type: Sub-task
>          Components: migration
>            Reporter: Enis Soztutar
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Critical
>             Fix For: 1.3.0, 1.4.0, 1.1.6, 1.2.3
>
>         Attachments: HBASE-16189.branch-1.patch, HBASE-16189.patch, HBASE-16189_branch-1.patch
>
>
> HBASE-10800 added MetaCellComparator, which gets written to the HFile. 1.x code does
not have the new class, hence fails to open the regions. I did not check whether this is only
for meta or for regular tables as well. 
> {code}
> Caused by: org.apache.hadoop.hbase.io.hfile.CorruptHFileException: Problem reading HFile
Trailer from file hdfs://cn017.l42scl.hortonworks.com:8020/apps/hbase/data/data/hbase/meta/1588230740/info/aa96e4ef463b4a82956330b236440437
>         at org.apache.hadoop.hbase.io.hfile.HFile.pickReaderVersion(HFile.java:483)
>         at org.apache.hadoop.hbase.io.hfile.HFile.createReader(HFile.java:511)
>         at org.apache.hadoop.hbase.regionserver.StoreFile$Reader.<init>(StoreFile.java:1123)
>         at org.apache.hadoop.hbase.regionserver.StoreFileInfo.open(StoreFileInfo.java:267)
>         at org.apache.hadoop.hbase.regionserver.StoreFile.open(StoreFile.java:409)
>         at org.apache.hadoop.hbase.regionserver.StoreFile.createReader(StoreFile.java:512)
>         at org.apache.hadoop.hbase.regionserver.HStore.createStoreFileAndReader(HStore.java:687)
>         at org.apache.hadoop.hbase.regionserver.HStore.access$000(HStore.java:130)
>         at org.apache.hadoop.hbase.regionserver.HStore$1.call(HStore.java:554)
>         at org.apache.hadoop.hbase.regionserver.HStore$1.call(HStore.java:551)
>         ... 6 more
> Caused by: java.io.IOException: java.lang.ClassNotFoundException: org.apache.hadoop.hbase.CellComparator$MetaCellComparator
>         at org.apache.hadoop.hbase.io.hfile.FixedFileTrailer.getComparatorClass(FixedFileTrailer.java:581)
>         at org.apache.hadoop.hbase.io.hfile.FixedFileTrailer.deserializeFromPB(FixedFileTrailer.java:300)
>         at org.apache.hadoop.hbase.io.hfile.FixedFileTrailer.deserialize(FixedFileTrailer.java:242)
>         at org.apache.hadoop.hbase.io.hfile.FixedFileTrailer.readFromStream(FixedFileTrailer.java:407)
>         at org.apache.hadoop.hbase.io.hfile.HFile.pickReaderVersion(HFile.java:468)
>         ... 15 more
> Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.hbase.CellComparator$MetaCellComparator
>         at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
>         at sun.misc.Launcher$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)
>         at org.apache.hadoop.hbase.io.hfile.FixedFileTrailer.getComparatorClass(FixedFileTrailer.java:579)
> {code}



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