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https://issues.apache.org/jira/browse/HBASE-7360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13593418#comment-13593418
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Matteo Bertozzi commented on HBASE-7360:
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Having a single manifest was discussed during the development in the snapshot
branch.
At the end was moved aside for the first cut since taking or restoring a
snapshot is something rare, and the impact is the same as the impact of the
cleaner after a table delete.
Also since the snapshot files creation is not done in parallel you're just
asking stuff to the NN with max N RS connection, so the time required to do the
snapshot is the same as the time required to do a roundtrip to the NN
(excluding all the other stuff like zk, ...)
>From my point of view, the "single" Manifest is just an improvement to speedup
>a bit the performance and have a compact snapshot format.
so the decision is, do we want a format 1 now and a format 2 later on or just a
format 2 later on?
> Snapshot 0.94 Backport
> -----------------------
>
> Key: HBASE-7360
> URL: https://issues.apache.org/jira/browse/HBASE-7360
> Project: HBase
> Issue Type: New Feature
> Components: snapshots
> Affects Versions: 0.94.3
> Reporter: Matteo Bertozzi
> Assignee: Matteo Bertozzi
> Fix For: 0.94.6
>
> Attachments: 7360-v1.patch, HBASE-7299-0.94.patch,
> HBASE-7360-jiras.txt, HBASE-7360-v0.patch
>
>
> Backport snapshot code to 0.94
> The main changes needed to backport the snapshot are related to the protobuf
> vs writable rpc.
> Offline Snapshot
> * HBASE-6610 HFileLink: Hardlink alternative for snapshot restore
> * HBASE-6765 Take a Snapshot interface
> ** This patch is significantly different because of the RPC changes between
> 0.94/0.96
> * HBASE-6571 Generic multi-thread/cross-process error handling framework
> * HBASE-6353 Snapshots shell
> * HBASE-7107 Snapshot References Utils (FileSystem Visitor)
> * HBASE-6836 Offline snapshots
> * HBASE-6865 Snapshot File Cleaners
> * HBASE-6777 Snapshot Restore Interface
> ** This patch is significantly different because of the RPC changes between
> 0.94/0.96
> * HBASE-6230 Clone/Restore Snapshots
> * HBASE-6802 Export Snapshot
> * HBASE-7240 Cleanup old snapshots on start
> * HBASE-7174 Refactor snapshot file cleaner cache to use Snapshot
> * HBASE-7367 Snapshot coprocessor and ACL security
> * HBASE-7311 Add snapshot information to hbase master webui
> ** This patch is significantly different because of the RPC changes between
> 0.94/0.96
> * HBASE-7418 HFileLink flaky test
> * HBASE-7420 TestSnapshotExceptionSnare and TestWALReferenceTask missing
> test category annotation and failing TestCheckTestClasses
> * HBASE-7206 ForeignException framework v2 (simplifies and replaces
> HBASE-6571)
> * HBASE-7430 TestSnapshotDescriptionUtils break compaction/scanner tests
> (EnvironmentEdge issue)
> * HBASE-7436 Improve stack trace info dumped by
> ForeignExceptionSnare#rethrowException
> * HBASE-7339 Splitting an HFileLink causes region servers to go down.
> * HBASE-7439 HFileLink should not use the configuration from the Filesystem
> * HBASE-7452 Change ForeignExceptionListener#receive(String, FE) to only be
> #receive(FE)
> * HBASE-7208 Transition Offline Snapshots to ForeignExceptions and Refactor
> for merge
> * HBASE-7207 Consolidate snapshot related classes into fewer packages
> * HBASE-7400 ExportSnapshot mapper closes the FileSystem
> * HBASE-7352 clone operation from HBaseAdmin can hang forever
> * HBASE-7294 Check for snapshot file cleaners on start
> * HBASE-7354 Snapshot Info/Debug Tool
> * HBASE-7423 HFileArchiver should not use the configuration from the
> Filesystem
> * HBASE-7453 HBASE-7423 snapshot followup
> * HBASE-7212 Globally Barriered Procedure Mechanism
> * HBASE-6864 Online snapshots scaffolding
> * HBASE-7321 Simple Flush Snapshot
> * HBASE-7496 TestZKProcedure fails interrmittently.
> * HBASE-7484 Fix Restore with schema changes
> * HBASE-7419 revisit hfilelink file name format
> * HBASE-7467 CleanerChore checkAndDeleteDirectory not deleting empty
> directories
> * HBASE-7214 CleanerChore logs too much, so much so it obscures all else
> that is going on
> * HBASE-7523 Snapshot attempt with the name of a previously taken snapshot
> fails sometimes.
> * HBASE-7480 Explicit message for not allowed snapshot on meta tables
> * HBASE-7537 .regioninfo not created by createHRegion()
> * HBASE-7535 Fix restore reference files
> * HBASE-7552 Pass bufferSize param to FileLinkInputStream constructor within
> FileLink.open method, and remove unnecessary import packages.
> * HBASE-7501 Introduce MetaEditor method that both adds and deletes rows in
> .META. table
> * HBASE-7365/HBASE-7389 Safer table creation and deletion using .tmp dir
> * HBASE-7547 Fix findbugs warnings in snapshot classes
> * HBASE-7548 Fix javadoc warnings in snapshot classes
> * HBASE-7538 Improve snapshot related error and exception messages
> * HBASE-7536 Add test that confirms that multiple concurrent snapshot
> requests are rejected
> * HBASE-7583 Fixes and cleanups
> * HBASE-7604 Remove duplicated code from HFileLink
> * HBASE-7616 NPE in ZKProcedure.nodeCreated
> * HBASE-7625 Remove duplicated logFSTree() from
> TestRestoreFlushSnapshotFromClient
> * HBASE-7627 UnsupportedOperationException in CatalogJanitor thread
> * HBASE-7622 Add table descriptor verification after snapshot restore
> * HBASE-7651 RegionServerSnapshotManager fails with CancellationException if
> previous snapshot fails in per region task
> * HBASE-7666 More logging improvements in online snapshots code
> * HBASE-7689 CloneTableHandler notify completion too early
> * HBASE-7699 Replace LOG.info() with LOG.debug() in FSUtils.listStatus()
> * HBASE-7703 Eventually all online snapshots failing due to Timeout at same
> regionserver.
> * HBASE-7720 Improve logging messages of failed snapshot attempts.
> * HBASE-7795 Race in the Restore Archiving
> * HBASE-7788 Fix flakey TestRestore*SnapshotFromClient#testCloneSnapshot
> * HBASE-7858 cleanup before merging snapshots branch to trunk
> * HBASE-7889 Fix javadoc warnings in snapshot classes
> * HBASE-7911 Remove duplicated code from CreateTableHandler
> * HBASE-7969 Rename HBaseAdmin#getCompletedSnapshots as
> HBaseAdmin#listSnapshots
> * HBASE-7299 TestMultiParallel fails intermittently in trunk builds
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