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From "jiraposter@reviews.apache.org (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5547) Don't delete HFiles when in "backup mode"
Date Wed, 11 Apr 2012 16:49:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13251727#comment-13251727
] 

jiraposter@reviews.apache.org commented on HBASE-5547:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/4633/#review6820
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src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
<https://reviews.apache.org/r/4633/#comment15202>

    done. Originally modeled after the catalog tracker in naming.



src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
<https://reviews.apache.org/r/4633/#comment15203>

    done.



src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
<https://reviews.apache.org/r/4633/#comment15204>

    done.



src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
<https://reviews.apache.org/r/4633/#comment15205>

    done



src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
<https://reviews.apache.org/r/4633/#comment15206>

    done.



src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
<https://reviews.apache.org/r/4633/#comment15207>

    Would rather not, since in that case we would keep around a persistent connection to ZK,
which is against what the community has been doing with cutting the client/zk connection (though
admittedly that not directly applicable here).



src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
<https://reviews.apache.org/r/4633/#comment15208>

    changed to confirmedArchiving.



src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
<https://reviews.apache.org/r/4633/#comment15184>

    Yeah, it would. But then you should not attempt to expect the archive as valid and fail
your backup process. Was going to leave it to the user to determine if they wanted to do the
cleanup.
    
    However, I would be ok if we added a method that cleaned up the filesystem for files created
in the backup after the archiving started. 
    
    Unfortunately, this means add an extra method on the master which I was trying to avoid,
but I guess its not the end of the world. We also have a two-phase commit issue here as we
also need to then write a 'consistent-confirmed' file into the archive when it completes to
ensure that failed clients don't break the archiving.
    
    thoughts?



src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
<https://reviews.apache.org/r/4633/#comment15209>

    done.



src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
<https://reviews.apache.org/r/4633/#comment15183>

    Method name isn't enough?



src/main/java/org/apache/hadoop/hbase/client/HFileArchiveManager.java
<https://reviews.apache.org/r/4633/#comment15210>

    done.



src/main/java/org/apache/hadoop/hbase/client/HFileArchiveManager.java
<https://reviews.apache.org/r/4633/#comment15211>

    done.



src/main/java/org/apache/hadoop/hbase/client/HFileArchiveManager.java
<https://reviews.apache.org/r/4633/#comment15212>

    done - regionsBeingArchived it is.



src/main/java/org/apache/hadoop/hbase/regionserver/HFileArchiveMonitor.java
<https://reviews.apache.org/r/4633/#comment15213>

    done.



src/main/java/org/apache/hadoop/hbase/regionserver/HFileArchiveMonitor.java
<https://reviews.apache.org/r/4633/#comment15185>

    Cruft from the earlier version.



src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
<https://reviews.apache.org/r/4633/#comment15186>

    yeah, guess it should be.



src/main/java/org/apache/hadoop/hbase/util/HFileArchiveUtil.java
<https://reviews.apache.org/r/4633/#comment15214>

    done.



src/main/java/org/apache/hadoop/hbase/util/HFileArchiveUtil.java
<https://reviews.apache.org/r/4633/#comment15187>

    This is a super rare case where the name of the regiondir to be backed up is the same
as the one in the backup already. Just being extra careful that the random storefile name
doesn't match, though it is _very_ unlikely to happen, it still could (which could lead to
bad circumstances). Currently, the storefile check doesn't check the archive directory and
I think it would be pretty big overhead to expect it to do that as well (lots of added dependencies,
calls, etc). We can just do the check and renaming here - its not super complicated and seems
to work.



src/main/java/org/apache/hadoop/hbase/zookeeper/HFileArchiveTracker.java
<https://reviews.apache.org/r/4633/#comment15215>

    done.



src/main/java/org/apache/hadoop/hbase/zookeeper/RegionServerHFileTracker.java
<https://reviews.apache.org/r/4633/#comment15216>

    done.


- Jesse


On 2012-04-07 19:51:11, Jesse Yates wrote:
bq.  
bq.  -----------------------------------------------------------
bq.  This is an automatically generated e-mail. To reply, visit:
bq.  https://reviews.apache.org/r/4633/
bq.  -----------------------------------------------------------
bq.  
bq.  (Updated 2012-04-07 19:51:11)
bq.  
bq.  
bq.  Review request for hbase, Michael Stack and Lars Hofhansl.
bq.  
bq.  
bq.  Summary
bq.  -------
bq.  
bq.  Essentially, whenever an hfile would be deleted, it is instead moved to the archive directory.
In this impl, the archive directory is on a per table basis, but defaults to '.archive'. Removing
hfiles occurs in three places - compaction, merge and catalog janitor. The former and two
latter are distinctly different code paths, but but did pull out some similarities. The latter
two end up calling the same method, so there should be a reasonable amount of overlap.
bq.  
bq.  Implementation wise: 
bq.      Updated the HMasterInterface to pass the calls onto the zookeeper.
bq.      Added a zk listener to handle updates from the master to the RS to backup.
bq.      Added a utility for removing files and finding archive directories
bq.      Added tests for the regionserver and catalogjanitor approaches.
bq.      Added creation of manager in regionserver.
bq.  
bq.  
bq.  This addresses bug HBASE-5547.
bq.      https://issues.apache.org/jira/browse/HBASE-5547
bq.  
bq.  
bq.  Diffs
bq.  -----
bq.  
bq.    src/main/java/org/apache/hadoop/hbase/HConstants.java a4b989e 
bq.    src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java 16e4017 
bq.    src/main/java/org/apache/hadoop/hbase/client/HFileArchiveManager.java PRE-CREATION

bq.    src/main/java/org/apache/hadoop/hbase/master/CatalogJanitor.java 79d5fdd 
bq.    src/main/java/org/apache/hadoop/hbase/master/HMaster.java fb21bdd 
bq.    src/main/java/org/apache/hadoop/hbase/regionserver/HFileArchiveMonitor.java PRE-CREATION

bq.    src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java c3df319 
bq.    src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java 8a61f7d 
bq.    src/main/java/org/apache/hadoop/hbase/regionserver/RegionServerServices.java 6884d53

bq.    src/main/java/org/apache/hadoop/hbase/regionserver/Store.java 509a467 
bq.    src/main/java/org/apache/hadoop/hbase/util/HFileArchiveUtil.java PRE-CREATION 
bq.    src/main/java/org/apache/hadoop/hbase/zookeeper/HFileArchiveTracker.java PRE-CREATION

bq.    src/main/java/org/apache/hadoop/hbase/zookeeper/RegionServerHFileTracker.java PRE-CREATION

bq.    src/main/java/org/apache/hadoop/hbase/zookeeper/ZooKeeperWatcher.java 4fc105f 
bq.    src/main/resources/hbase-default.xml 44ee689 
bq.    src/test/java/org/apache/hadoop/hbase/master/MockRegionServer.java 41616c8 
bq.    src/test/java/org/apache/hadoop/hbase/master/TestCatalogJanitor.java b4dcb83 
bq.    src/test/java/org/apache/hadoop/hbase/regionserver/TestRegionHFileArchiving.java PRE-CREATION

bq.    src/test/java/org/apache/hadoop/hbase/util/HFileArchiveTestingUtil.java PRE-CREATION

bq.    src/test/java/org/apache/hadoop/hbase/util/MockRegionServerServices.java 7d02759 
bq.  
bq.  Diff: https://reviews.apache.org/r/4633/diff
bq.  
bq.  
bq.  Testing
bq.  -------
bq.  
bq.  Added two tests for the separate cases - archiving via the regionserver and for the catalog
tracker. Former runs in a mini cluster and also touches the changes to HMasterInterface and
zookeeper.
bq.  
bq.  
bq.  Thanks,
bq.  
bq.  Jesse
bq.  
bq.


                
> Don't delete HFiles when in "backup mode"
> -----------------------------------------
>
>                 Key: HBASE-5547
>                 URL: https://issues.apache.org/jira/browse/HBASE-5547
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Lars Hofhansl
>            Assignee: Jesse Yates
>
> This came up in a discussion I had with Stack.
> It would be nice if HBase could be notified that a backup is in progress (via a znode
for example) and in that case either:
> 1. rename HFiles to be delete to <file>.bck
> 2. rename the HFiles into a special directory
> 3. rename them to a general trash directory (which would not need to be tied to backup
mode).
> That way it should be able to get a consistent backup based on HFiles (HDFS snapshots
or hard links would be better options here, but we do not have those).
> #1 makes cleanup a bit harder.

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