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https://issues.apache.org/jira/browse/HBASE-13339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14518512#comment-14518512
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Nick Dimiduk commented on HBASE-13339:
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I've reviewed the upgrade docs and checked with some HDFS committers,
[~cnauroth] confirmed. HDFS is rolling-upgradable from 2.4 to all subsequent
released. Apparently upgrades are one-way; roll-back from an upgrade in
progress is not supported yet. Between that and the compat report, it seems to
be that 2.5 and 2.6 are interchangeable as far as client applications and
operations are concerned.
*IF* we're saying that our decided hadoop version is our project making a
statement regarding which HDFS is "canon" for this release (which I read to be
the case based on [~eclark]'s reasoning above), then I suggest we evaluate if
an upgrade is prudent for 1.1.0.
So, *if* we're going to "anoint" a stable HDFS for the 1.1.x line, my vote is
for 2.6 because HDFS-7005 is worse for more users than HADOOP-11708 and
HDFS-8270 combined.
However, *if* our hadoop dependency version is simply for compile-time API
compatibility checking, then I don't really care because they're
interchangeable. We should have a big flashing light in our book telling people
to research the latest on their HDFS version anyway.
At this point I just want a decision for 1.1.0.
[~eclark], [~lhofhansl], [~apurtell], [~stack], [~busbey].
> Update default Hadoop version to 2.6.0
> --------------------------------------
>
> Key: HBASE-13339
> URL: https://issues.apache.org/jira/browse/HBASE-13339
> Project: HBase
> Issue Type: Bug
> Components: build
> Affects Versions: 2.0.0, 1.1.0
> Reporter: Elliott Clark
> Assignee: Elliott Clark
> Priority: Blocker
> Fix For: 2.0.0, 1.1.0, 1.2.0
>
> Attachments: HBASE-13339-v1.patch, HBASE-13339.patch
>
>
> Current default Hadoop version is getting a little long in the tooth. We
> should update to the latest version. The latest version is backwards
> compatible with 2.5.1's dfs and mr so this should be painless.
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