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https://issues.apache.org/jira/browse/HBASE-11643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14114728#comment-14114728
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Jingcheng Du commented on HBASE-11643:
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Now we have made some changes in the design.
1. Change the checksumHexString(startKey) to md5HexString(startKey) as the mob
file prefix. After this, we could avoid the checksum conflict between regions
and this might be useful in future.
2. Add a new tag to the mob cell(its value is the realMobValueLength +
fileNameOfMobFile) in HBase. This tag has the table name where the cell is
flushed. It's useful in cloning table and reading from the cloned table.
These changes will be applied in the design document and upload it later.
> Read and write MOB in HBase
> ---------------------------
>
> Key: HBASE-11643
> URL: https://issues.apache.org/jira/browse/HBASE-11643
> Project: HBase
> Issue Type: Sub-task
> Components: regionserver, Scanners
> Reporter: Jingcheng Du
> Assignee: Jingcheng Du
> Attachments: HBASE-11643-V10.diff, HBASE-11643-V11.diff,
> HBASE-11643-V12.diff, HBASE-11643-V13.diff, HBASE-11643-V14.diff,
> HBASE-11643-V15.diff, HBASE-11643-V2.diff, HBASE-11643-V3.diff,
> HBASE-11643-V4.diff, HBASE-11643-V5.diff, HBASE-11643-V6.diff,
> HBASE-11643-V7.diff, HBASE-11643-V8.diff, HBASE-11643-V9.diff,
> HBase-11643.diff
>
>
> The read/write MOB in HBase are implemented in this JIRA. Normally, the Cells
> are saved in the MemStore, and flushed to the HFiles when necessary. For MOB,
> the Cells are saved in the MemStore as well, but they're flushed to elsewhere
> out of HBase in the format of HFiles.
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