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Posted to issues@hbase.apache.org by "Ted Yu (JIRA)" <ji...@apache.org> on 2013/03/05 00:55:12 UTC
[jira] [Commented] (HBASE-7987) Snapshot Manifest file instead of
multiple empty files
[ https://issues.apache.org/jira/browse/HBASE-7987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13592814#comment-13592814 ]
Ted Yu commented on HBASE-7987:
-------------------------------
Would this optimization introduce versioning for snapshots ?
There may be the empty files produced by current implementation of snapshots.
> 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
> Priority: Minor
>
> 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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