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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 Sat, 07 Apr 2012 19:52:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13249319#comment-13249319

jiraposter@reviews.apache.org commented on HBASE-5547:

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(Updated 2012-04-07 19:51:11.515830)

Review request for hbase, Michael Stack and Lars Hofhansl.


A bit rearchitecting in the new patch:
1) Separated the client and server archiving into distinct classes (and saved changes to HMasterInferface)
2) A lot of the functions in the ArchiveUtil were moved to their respective classes and move
a couple smaller methods in
3) Added a synchronous enable as the default for the client
4) Merged the tracker and the manger into the tracker and pulled out the important methods
into a monitor interface.
5) Addressed Ted's comments from the last patch (and hopefully didn't add them back in the
6) Added a bunch of testing


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.

Implementation wise: 
    Updated the HMasterInterface to pass the calls onto the zookeeper.
    Added a zk listener to handle updates from the master to the RS to backup.
    Added a utility for removing files and finding archive directories
    Added tests for the regionserver and catalogjanitor approaches.
    Added creation of manager in regionserver.

This addresses bug HBASE-5547.

Diffs (updated)

  src/main/java/org/apache/hadoop/hbase/HConstants.java a4b989e 
  src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java 16e4017 
  src/main/java/org/apache/hadoop/hbase/client/HFileArchiveManager.java PRE-CREATION 
  src/main/java/org/apache/hadoop/hbase/master/CatalogJanitor.java 79d5fdd 
  src/main/java/org/apache/hadoop/hbase/master/HMaster.java fb21bdd 
  src/main/java/org/apache/hadoop/hbase/regionserver/HFileArchiveMonitor.java PRE-CREATION

  src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java c3df319 
  src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java 8a61f7d 
  src/main/java/org/apache/hadoop/hbase/regionserver/RegionServerServices.java 6884d53 
  src/main/java/org/apache/hadoop/hbase/regionserver/Store.java 509a467 
  src/main/java/org/apache/hadoop/hbase/util/HFileArchiveUtil.java PRE-CREATION 
  src/main/java/org/apache/hadoop/hbase/zookeeper/HFileArchiveTracker.java PRE-CREATION 
  src/main/java/org/apache/hadoop/hbase/zookeeper/RegionServerHFileTracker.java PRE-CREATION

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

  src/test/java/org/apache/hadoop/hbase/util/HFileArchiveTestingUtil.java PRE-CREATION 
  src/test/java/org/apache/hadoop/hbase/util/MockRegionServerServices.java 7d02759 

Diff: https://reviews.apache.org/r/4633/diff


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



> 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
> 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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