arp7 commented on a change in pull request #948: HDDS-1649. On installSnapshot
notification from OM leader, download checkpoint and reload OM state
URL: https://github.com/apache/hadoop/pull/948#discussion_r293599252
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File path:
hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/OzoneManager.java
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@@ -3122,6 +3136,131 @@ public boolean setAcl(OzoneObj obj, List<OzoneAcl>
acls) throws IOException {
}
}
+ /**
+ * Download and install latest checkpoint from leader OM.
+ * If the download checkpoints snapshot index is greater than this OM's
+ * last applied transaction index, then re-initialize the OM state via this
+ * checkpoint. Before re-initializing OM state, the OM Ratis server should
+ * be stopped so that no new transactions can be applied.
+ * @param leaderId peerNodeID of the leader OM
+ * @return If checkpoint is installed, return the corresponding termIndex.
+ * Otherwise, return null.
+ */
+ public TermIndex installSnapshot(String leaderId) {
+ if (omSnapshotProvider == null) {
+ LOG.error("OM Snapshot Provider is not configured as there are no peer "
+
+ "nodes.");
+ return null;
+ }
+
+ DBCheckpoint omDBcheckpoint;
+ try {
+ omDBcheckpoint = omSnapshotProvider.getOzoneManagerDBSnapshot(leaderId);
Review comment:
One question: currently we are passing `leaderId` = null. So will this call
to `getOzoneManagerDBSnapshot` fail?
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