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https://issues.apache.org/jira/browse/HBASE-21582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16719684#comment-16719684
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Zheng Hu commented on HBASE-21582:
----------------------------------
Addressed the checkstyle and pushed to
branch-1/branch-1.2/branch-1.4/branch-2/branch-2.0/branch-2.1/master . Thanks
[~Apache9] for reviewing.
> If call HBaseAdmin#snapshotAsync but forget call isSnapshotFinished, then
> SnapshotHFileCleaner will skip to run every time
> --------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-21582
> URL: https://issues.apache.org/jira/browse/HBASE-21582
> Project: HBase
> Issue Type: Bug
> Reporter: Zheng Hu
> Assignee: Zheng Hu
> Priority: Major
> Fix For: 3.0.0, 1.5.0, 2.2.0, 2.1.2, 1.2.10, 1.4.10, 2.0.5
>
> Attachments: HBASE-21582.branch-1.v3.patch, HBASE-21582.v1.patch,
> HBASE-21582.v2.patch, HBASE-21582.v3.patch
>
>
> This is because we remove the SnapshotSentinel from snapshotHandlers in
> SnapshotManager#cleanupSentinels. Only when the following 3 case, the
> cleanupSentinels will be called:
> 1. SnapshotManager#isSnapshotDone;
> 2. SnapshotManager#takeSnapshot;
> 3. SnapshotManager#restoreOrCloneSnapshot
> So if no isSnapshotDone called, or no further snapshot taking, or snapshot
> restore/clone. the SnapshotSentinel will always be keep in snapshotHandlers.
> But after HBASE-21387, Only when no snapshot taking, the
> SnapshotHFileCleaner will check the unref files and clean.
> I found this bug, because in our XiaoMi branch-2, we implement the soft
> delete feature, which means if someone delete a table, then master will
> create a snapshot firstly, after that, the table deletion begain. the
> implementation is quite simple, we use the snapshotManager to create a
> snapshot.
> {code}
> diff --git
> a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
> b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
> index 8f42e4a..6da6a64 100644
> --- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
> +++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
> @@ -2385,12 +2385,6 @@ public class HMaster extends HRegionServer implements
> MasterServices {
> protected void run() throws IOException {
> getMaster().getMasterCoprocessorHost().preDeleteTable(tableName);
>
> + if (snapshotBeforeDelete) {
> + LOG.info("Take snaposhot for " + tableName + " before deleting");
> + snapshotManager
> +
> .takeSnapshot(SnapshotDescriptionUtils.getSnapshotNameForDeletedTable(tableName));
> + }
> +
> LOG.info(getClientIdAuditPrefix() + " delete " + tableName);
>
> // TODO: We can handle/merge duplicate request
> {code}
> In the master, I found the endless log after delete a table:
> {code}
> org.apache.hadoop.hbase.master.snapshot.SnapshotFileCache: Not checking
> unreferenced files since snapshot is running, it will skip to clean the
> HFiles this time
> {code}
> This is because the snapshotHandlers never be cleaned after call the
> snapshotManager#takeSnapshot. I think the asynSnapshot may has the same
> problem.
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