Zheng Hu created HBASE-21582:
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Summary: 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
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.
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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