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https://issues.apache.org/jira/browse/HBASE-1112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12667432#action_12667432
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Jim Kellerman commented on HBASE-1112:
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How likely is this really?
The HLog directory name is:
"log_" + ipaddress-of-server + "_" + server-start-code + "_" +
server-port-number
Whereas region region directories are just the region name. For example, region
directory names:
{code}
drwxr-xr-x - jim supergroup 0 2009-01-26 19:26 /hbase/-ROOT-
drwxr-xr-x - jim supergroup 0 2009-01-26 19:26 /hbase/.META.
drwxr-xr-x - jim supergroup 0 2009-01-26 19:53 /hbase/TestTable
{code}
Examples of log directory names:
{code}
drwxr-xr-x - jim supergroup 0 2009-01-26 21:15
/hbase/log_208.76.44.139_1233004558648_8020
drwxr-xr-x - jim supergroup 0 2009-01-26 21:15
/hbase/log_208.76.44.140_1233004558283_8020
drwxr-xr-x - jim supergroup 0 2009-01-26 21:15
/hbase/log_208.76.44.141_1233004558140_8020
{code}
Seems to me the chance for collision is pretty small.
> we will lose data if the table name happens to be the logs' dir name
> --------------------------------------------------------------------
>
> Key: HBASE-1112
> URL: https://issues.apache.org/jira/browse/HBASE-1112
> Project: Hadoop HBase
> Issue Type: Bug
> Reporter: Samuel Guo
> Priority: Minor
> Fix For: 0.20.0
>
> Attachments: HBASE-1112.patch
>
>
> If the tablename happens to equal with the logs' dir name of a certain
> regionserver, the table will store table's data into the same dir in HDFS
> shared with the regionserver's log dir. If the specified region server fails,
> the dir may be removed after the logs are replayed. And here, we lose the
> data.
> I suggest that a special char like '_' could be added before the logdir's
> name, just as what root region and meta region have done. So we can prevent
> the user table's data from being stored in a log dir. for example,
> 'log_10.132.15.1_1231465024534_60020' will be changed to
> '_log_10.132.15.1_1231465024534_60020'.
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