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From: "Enis Soztutar (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-7987) Snapshot Manifest file instead of
 multiple empty files
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    [ https://issues.apache.org/jira/browse/HBASE-7987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13971996#comment-13971996 ] 

Enis Soztutar commented on HBASE-7987:
--------------------------------------

bq. I see this jira more as a "improve the current situation", without having to change much of the current design.
Yeah, I really think that we should switch to meta table tracking the file references. This might be ok for short term if it does not add bunch of more complexity. 


> Snapshot Manifest file instead of multiple empty files
> ------------------------------------------------------
>
>                 Key: HBASE-7987
>                 URL: https://issues.apache.org/jira/browse/HBASE-7987
>             Project: HBase
>          Issue Type: Improvement
>          Components: snapshots
>            Reporter: Matteo Bertozzi
>            Assignee: Matteo Bertozzi
>             Fix For: 1.0.0
>
>         Attachments: HBASE-7987-v0.patch, HBASE-7987-v1.patch, HBASE-7987-v2.patch, HBASE-7987-v2.sketch, HBASE-7987-v3.patch, HBASE-7987-v4.patch, HBASE-7987.sketch
>
>
> Currently taking a snapshot means creating one empty file for each file in the source table directory, plus copying the .regioninfo file for each region, the table descriptor file and a snapshotInfo file.
> during the restore or snapshot verification we traverse the filesystem (fs.listStatus()) to find the snapshot files, and we open the .regioninfo files to get the information.
> to avoid hammering the NameNode and having lots of empty files, we can use a manifest file that contains the list of files and information that we need.
> To keep the RS parallelism that we have, each RS can write its own manifest.
> {code}
> message SnapshotDescriptor {
>   required string name;
>   optional string table;
>   optional int64 creationTime;
>   optional Type type;
>   optional int32 version;
> }
> message SnapshotRegionManifest {
>   optional int32 version;
>   required RegionInfo regionInfo;
>   repeated FamilyFiles familyFiles;
>   message StoreFile {
>     required string name;
>     optional Reference reference;
>   }
>   message FamilyFiles {
>     required bytes familyName;
>     repeated StoreFile storeFiles;
>   }
> }
> {code}
> {code}
> /hbase/.snapshot/<snapshotName>
> /hbase/.snapshot/<snapshotName>/snapshotInfo
> /hbase/.snapshot/<snapshotName>/<tableName>
> /hbase/.snapshot/<snapshotName>/<tableName>/tableInfo
> /hbase/.snapshot/<snapshotName>/<tableName>/regionManifest(.n)
> {code}



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