[jira] [Commented] (HBASE-21981) MMaped bucket cache IOEngine does not work with persistence

["HBase QA (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-21981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16975065#comment-16975065 ] 

HBase QA commented on HBASE-21981:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m  7s{color} | {color:red} HBASE-21981 does not apply to master. Rebase required? Wrong Branch? See https://yetus.apache.org/documentation/in-progress/precommit-patchnames for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HBASE-21981 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12960889/HBASE-21981.patch |
| Console output | https://builds.apache.org/job/PreCommit-HBASE-Build/1022/console |
| versions | git=2.17.1 |
| Powered by | Apache Yetus 0.11.1 https://yetus.apache.org |


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> MMaped bucket cache IOEngine does not work with persistence
> -----------------------------------------------------------
>
>                 Key: HBASE-21981
>                 URL: https://issues.apache.org/jira/browse/HBASE-21981
>             Project: HBase
>          Issue Type: Bug
>          Components: BucketCache
>    Affects Versions: 2.1.3
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: Anoop Sam John
>            Priority: Major
>             Fix For: 3.0.0, 2.3.0, 2.2.3, 2.1.9
>
>         Attachments: HBASE-21981.patch, HBASE-21981.patch
>
>
> The MMap based IOEngines does not retrieve the data back if 'hbase.bucketcache.persistent.path' is enabled. FileIOEngine works fine but only the FileMMapEngine has this problem.
> The reason is that we don't get the byte buffers in the proper order while reading back from the file in case of persistence.



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