maheshk114 commented on a change in pull request #949: HIVE-22990 Add file
based ack for replication
URL: https://github.com/apache/hive/pull/949#discussion_r392089082
##########
File path: ql/src/java/org/apache/hadoop/hive/ql/exec/repl/ReplDumpTask.java
##########
@@ -126,21 +126,30 @@ public int execute() {
Path dumpRoot = new Path(conf.getVar(HiveConf.ConfVars.REPLDIR),
Base64.getEncoder().encodeToString(work.dbNameOrPattern.toLowerCase()
.getBytes(StandardCharsets.UTF_8.name())));
- Path currentDumpPath = new Path(dumpRoot, getNextDumpDir());
- Path hiveDumpRoot = new Path(currentDumpPath,
ReplUtils.REPL_HIVE_BASE_DIR);
- DumpMetaData dmd = new DumpMetaData(hiveDumpRoot, conf);
- // Initialize ReplChangeManager instance since we will require it to
encode file URI.
- ReplChangeManager.getInstance(conf);
- Path cmRoot = new Path(conf.getVar(HiveConf.ConfVars.REPLCMDIR));
- Long lastReplId;
- if (!dumpRoot.getFileSystem(conf).exists(dumpRoot)
- || dumpRoot.getFileSystem(conf).listStatus(dumpRoot).length ==
0) {
- lastReplId = bootStrapDump(hiveDumpRoot, dmd, cmRoot, hiveDb);
+ Path previousDumpMetaPath = getPreviousDumpMetadataPath(dumpRoot);
+ Path previousHiveDumpPath =
+ previousDumpMetaPath != null ? new Path(previousDumpMetaPath,
ReplUtils.REPL_HIVE_BASE_DIR) : null;
+ //If no previous dump is present or previous dump was loaded, proceed
+ if (shouldDump(previousHiveDumpPath)) {
+ Path currentDumpPath = new Path(dumpRoot, getNextDumpDir());
+ Path hiveDumpRoot = new Path(currentDumpPath,
ReplUtils.REPL_HIVE_BASE_DIR);
+ DumpMetaData dmd = new DumpMetaData(hiveDumpRoot, conf);
+ // Initialize ReplChangeManager instance since we will require it to
encode file URI.
+ ReplChangeManager.getInstance(conf);
+ Path cmRoot = new Path(conf.getVar(HiveConf.ConfVars.REPLCMDIR));
+ Long lastReplId;
+ if (previousHiveDumpPath == null) {
+ lastReplId = bootStrapDump(hiveDumpRoot, dmd, cmRoot, hiveDb);
+ } else {
+
work.setEventFrom(getEventFromPreviousDumpMetadata(previousHiveDumpPath));
+ lastReplId = incrementalDump(hiveDumpRoot, dmd, cmRoot, hiveDb);
+ }
+ prepareReturnValues(Arrays.asList(currentDumpPath.toUri().toString(),
String.valueOf(lastReplId)));
+ writeDumpCompleteAck(hiveDumpRoot);
+ deletePreviousDumpMeta(previousDumpMetaPath);
Review comment:
what if delete fails /system goes down after the dump ..how to cleanup the
previous dump directory ?
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