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https://issues.apache.org/jira/browse/HBASE-8760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13736468#comment-13736468
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Jerry He commented on HBASE-8760:
---------------------------------
Some exceptions were seen against 0.95.2 during step 14. It is different from
0.94. But it could just be due to random timing.
Step 13 was ok.
Step 14 was ok as successful as well, but there were errors in the logs:
{code}
2013-08-10 23:00:16,463 ERROR [RS_OPEN_REGION-hdtest009:60021-1]
handler.OpenRegionHandler: Failed open of
region=TestTable_clone_clone,,1376197826879.c3ea5fba0fe4a49a9e93102d133b99fd.,
starting to roll back the global memstore size.
...
Caused by: java.io.IOException: java.io.FileNotFoundException: Unable to open
link: org.apache.hadoop.hbase.io.HFileLink
locations=[hdfs://hdtest009.svl.ibm.com:9000/hbase95/.data/default/TestTable_clone/9d76f97c231b0ffa4f9ecbe73bfc2acd/info/9af07c31650045d28aa13d8b37251690,
hdfs://hdtest009.svl.ibm.com:9000/hbase95/.tmp/.data/default/TestTable_clone/9d76f97c231b0ffa4f9ecbe73bfc2acd/info/9af07c31650045d28aa13d8b37251690,
hdfs://hdtest009.svl.ibm.com:9000/hbase95/.archive/.data/default/TestTable_clone/9d76f97c231b0ffa4f9ecbe73bfc2acd/info/9af07c31650045d28aa13d8b37251690]
at
org.apache.hadoop.hbase.regionserver.HStore.loadStoreFiles(HStore.java:448)
at org.apache.hadoop.hbase.regionserver.HStore.<init>(HStore.java:241)
at
org.apache.hadoop.hbase.regionserver.HRegion.instantiateHStore(HRegion.java:3122)
{code}
Based on the logs, the failed region was a parent region. The daughters regions
were ok. Therefore the end row count was good.
Again if you need relevant logs, I can send to you or attach here.
> possible loss of data in snapshot taken after region split
> ----------------------------------------------------------
>
> Key: HBASE-8760
> URL: https://issues.apache.org/jira/browse/HBASE-8760
> Project: HBase
> Issue Type: Bug
> Components: snapshots
> Affects Versions: 0.94.8, 0.95.1
> Reporter: Jerry He
> Fix For: 0.98.0, 0.95.2, 0.94.12
>
> Attachments: HBase-8760-0.94.8.patch, HBase-8760-0.94.8-v1.patch,
> HBASE-8760-0.94-v4.patch, HBASE-8760-thz-v0.patch, HBASE-8760-thz-v1.patch,
> HBASE-8760-thz-v2.patch, HBASE-8760-thz-v3.patch, HBASE-8760-v4.patch
>
>
> Right after a region split but before the daughter regions are compacted, we
> have two daughter regions containing Reference files to the parent hfiles.
> If we take snapshot right at the moment, the snapshot will succeed, but it
> will only contain the daughter Reference files. Since there is no hold on the
> parent hfiles, they will be deleted by the HFile Cleaner after they are no
> longer needed by the daughter regions soon after.
> A minimum we need to do is the keep these parent hfiles from being deleted.
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