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HDFS, mail # dev - Re: collision in the naming of '.snapshot' directory between hdfs snapshot and hbase snapshot


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Ted Yu 2013-04-16, 17:00
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lars hofhansl 2013-04-16, 17:12
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Ted Yu 2013-04-16, 21:02
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Harsh J 2013-04-17, 08:10
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Azuryy Yu 2013-04-17, 08:19
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Andrew Purtell 2013-04-17, 16:14
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Tsz Wo Sze 2013-04-18, 20:50
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Ted Yu 2013-04-16, 02:13
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lars hofhansl 2013-04-16, 03:00
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Ted Yu 2013-04-16, 03:12
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Ted Yu 2013-04-16, 03:18
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Azuryy Yu 2013-04-16, 03:23
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Ted Yu 2013-04-16, 03:26
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Tsz Wo Sze 2013-04-16, 02:34
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Azuryy Yu 2013-04-16, 02:33
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lars hofhansl 2013-04-16, 03:47
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Ted Yu 2013-04-16, 03:31
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Enis Söztutar 2013-04-16, 03:52
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Ted Yu 2013-04-16, 04:00
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Ted Yu 2013-04-16, 04:17
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Re: collision in the naming of '.snapshot' directory between hdfs snapshot and hbase snapshot
Ted Yu 2013-04-16, 06:11
I have logged HBASE-8352

Cheers

On Mon, Apr 15, 2013 at 9:17 PM, Ted Yu <[EMAIL PROTECTED]> wrote:

> I have a patch which touched these tests:
>
> http://pastebin.com/P4p8LEAZ
>
> I am running 0.94 test suite now - will publish patch and test result in
> the morning.
>
> Cheers
>
>
> On Mon, Apr 15, 2013 at 9:00 PM, Ted Yu <[EMAIL PROTECTED]> wrote:
>
>> bq. Alternatively, we can detect the underlying Hadoop version, and use
>> either .snapshot or .hbase_snapshot in 0.94 depending on h1 & h2.
>>
>> I think this would introduce more confusion, especially for operations.
>>
>> Cheers
>>
>> On Mon, Apr 15, 2013 at 8:52 PM, Enis Söztutar <[EMAIL PROTECTED]>wrote:
>>
>>> Because HDFS exposes the snapshots so that the normal file system
>>> operations are mapped inside snapshot dirs, I think HDFS reserving the
>>> .snapshot name makes sense. OTOH, nothing is specific about the dir name
>>> that is chosen by HBase.
>>>
>>> I would prefer to change the dir name in 0.94 as well, since 0.94 is also
>>> being run on top of hadoop 2. Alternatively, we can detect the underlying
>>> Hadoop version, and use either .snapshot or .hbase_snapshot in 0.94
>>> depending on h1 & h2.
>>>
>>> Enis
>>>
>>>
>>> On Mon, Apr 15, 2013 at 8:31 PM, Ted Yu <[EMAIL PROTECTED]> wrote:
>>>
>>> > bq. let's make the hbase snapshot for a conf variable.
>>> >
>>> > Once we decide on the new name of snapshot directory, we should still
>>> use
>>> > hardcoded value. This aligns with current code base:
>>> > See this snippet from HConstants:
>>> >
>>> >   public static final List<String> HBASE_NON_TABLE_DIRS >>> >
>>> >     Collections.unmodifiableList(Arrays.asList(new String[] {
>>> > HREGION_LOGDIR_NAME,
>>> >
>>> >       HREGION_OLDLOGDIR_NAME, CORRUPT_DIR_NAME, SPLIT_LOGDIR_NAME,
>>> >
>>> >       HBCK_SIDELINEDIR_NAME, HFILE_ARCHIVE_DIRECTORY,
>>> SNAPSHOT_DIR_NAME,
>>> > HBASE_TEMP_DIRECTORY }));
>>> > Cheers
>>> >
>>> > On Mon, Apr 15, 2013 at 8:24 PM, Jonathan Hsieh <[EMAIL PROTECTED]>
>>> wrote:
>>> >
>>> > > constraints:
>>> > >
>>> > > 1) hbase 0.94.6 is released and .snapshot is hardcoded in there.
>>> > > 2) hdfs snapshots is a Hadoop 2.1 or 3.0 feature. I doubt that it
>>> will
>>> > ever
>>> > > make it to 1.x.  This hdfs feature ideally this shouldn't affect
>>> current
>>> > A
>>> > > pache Hbase 0.94.x's.
>>> > > 3) hbase 95/96 may default to Hadoop1 or Hadoop 2. these versions
>>> should
>>> > > pick a different table snapshot name to respect fs conventions.
>>> > >
>>> > > proposed actions:
>>> > >
>>> > > 1) let's make the hbase snapshot for a conf variable. (hbase.
>>> > > snapshots.dir)  let's change the default for hbase 95+. (maybe
>>> > > .hbase-snapshots). we'll also port this patch to 0.94.x
>>> > > 2) let's publish instructions on how to update the hbase snapshot
>>> dir:
>>> > > shutdown hbase, config update, rename dir, restart hbase.
>>> > > 3) I lean towards leaving the current default hbase snapshot dir in
>>> 94
>>> > > since it shouldn't be affected.  upgrading hbase to 95/96 will
>>> require
>>> > > shutdown and update scripts so it seems like the ideal time to
>>> autoforce
>>> > > this default change.
>>> > >
>>> > > Thoughts?
>>> > >
>>> > >
>>> > > On Monday, April 15, 2013, lars hofhansl wrote:
>>> > >
>>> > > > OK. Let's try to fix that quickly, so that I can release HBase
>>> 0.94.7.
>>> > > >
>>> > > > -- Lars
>>> > > >
>>> > > >
>>> > > >
>>> > > > ________________________________
>>> > > >  From: Ted Yu <[EMAIL PROTECTED]>
>>> > > > To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
>>> > > > Sent: Monday, April 15, 2013 7:13 PM
>>> > > > Subject: collision in the naming of '.snapshot' directory between
>>> hdfs
>>> > > > snapshot and hbase snapshot
>>> > > >
>>> > > >
>>> > > > Hi,
>>> > > > This afternoon Huned ad I discovered an issue while playing with
>>> HBase
>>> > > > Snapshots on top of Hadoop's Snapshot branch (
>>> > > > http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-2802/).
>>> > > >
>>
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Harsh J 2013-04-18, 06:16