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https://issues.apache.org/jira/browse/HBASE-29021?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jaehui Lee resolved HBASE-29021.
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Resolution: Fixed
> When StoreFileTracker is FILE, unable to recognize StoreFileListFile after
> upgrade from 2.5 to 2.6
> --------------------------------------------------------------------------------------------------
>
> Key: HBASE-29021
> URL: https://issues.apache.org/jira/browse/HBASE-29021
> Project: HBase
> Issue Type: Bug
> Components: HFile, regionserver
> Affects Versions: 2.6.1, 2.5.10
> Reporter: Ke Han
> Assignee: Jaehui Lee
> Priority: Critical
> Labels: pull-request-available
>
> h1. Symptoms
> After upgrading from HBase 2.5.10 to HBase 2.6.1, I observed an inconsistent
> read across versions.
> Before the upgrade, I created a table with one row. Invoking a count command
> returns 1. After upgrading to 2.6.1, execute the same count command, it
> returns 0.
> {code:java}
> count 'test'
> Old Version Result:
> 1 row(s)
> Took 0.5582 seconds
> => 1
> New Version Result:
> 0 row(s)
> Took 1.4439 seconds
> => 0 {code}
> h1. Reproduce
> It can be reproduced deterministically with the following steps
> Step1: Start up the HBase cluster in 2.5.10 and execute the following commands
> {code:java}
> create 'test', 'cf', CONFIGURATION => {'hbase.store.file-tracker.impl' =>
> 'FILE'}
> put 'test', 'row', 'cf:q', 'value'{code}
> Step2: Execute the count command in the old version
> {code:java}
> count 'test'
> 1 row(s)
> Took 0.5582 seconds
> => 1 {code}
> Step3: Stop the entire cluster, upgrade to 2.6.1 and execute the same count
> command
> {code:java}
> count 'test'
> 0 row(s)
> Took 0.0842 seconds
> => 0{code}
> h1. Analysis
> The names of {{StoreFileListFile}} differ between the two versions:
> * In 2.5.10: {{f1}} or {{f2}}
> * In 2.6.1: {{{}f1.{timestamp{}}}} or {{{}f2.{timestamp{}}}}
> The addition of a timestamp to the file name was introduced in HBASE-26791.
> When upgrading HBase versions, this issue can be resolved by handling missing
> timestamps by setting them to 0.
> However, in the case of downgrading versions, the above approach does not
> work. A workaround is available:
> * Change the storefile tracker implementation from {{FILE}} -> {{MIGRATION}}
> -> {{DEFAULT}} before downgrading.
> if the HBase version is changed without modifying the storefile tracker
> implementation, files may not be recognized.
> In such cases, the same workaround can be applied.
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