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https://issues.apache.org/jira/browse/HBASE-21012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16575012#comment-16575012
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Josh Elser commented on HBASE-21012:
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{quote}This issue is about the forward compatibility rather than backward
compatibility. The older hbase can't read hfiles generated by later versions.
{quote}
Sorry! I got it backwards :)
If we don't have a separate reader class (which I assume is the case), you
could do the opposite of what I suggested. Include a test that reads the newer
file and make sure that test passes on 1.x branches (running the test on 2.x
would be essentially pointless, but that's OK I think).
> Revert the change of serializing TimeRangeTracker
> -------------------------------------------------
>
> Key: HBASE-21012
> URL: https://issues.apache.org/jira/browse/HBASE-21012
> Project: HBase
> Issue Type: Sub-task
> Reporter: Chia-Ping Tsai
> Assignee: Kuan-Po Tseng
> Priority: Critical
> Fix For: 3.0.0, 2.0.2, 2.1.1
>
> Attachments: HBASE-21012.master.001.patch,
> HBASE-21012.master.002.patch, HBASE-21012.master.003.patch,
> HBASE-21012.master.003.patch, HBASE-21012.master.004.patch,
> HBASE-21012.master.005.patch
>
>
> HBASE-18754 change the serialization of TimeRangeTracker from "manual way" to
> protobuf. However, the change breaks the backward compatibility of hfile. We
> should revert the change ASAP.
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