virajjasani commented on code in PR #5513:
URL: https://github.com/apache/hbase/pull/5513#discussion_r1388705399
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hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java:
##########
@@ -1399,23 +1399,46 @@ private void
createMissingCFsInMetaDuringUpgrade(TableDescriptor metaDescriptor)
* Check hbase:meta is up and ready for reading. For use during Master
startup only.
* @return True if meta is UP and online and startup can progress.
Otherwise, meta is not online
* and we will hold here until operator intervention.
+ * @throws IOException If the master restart is required.
*/
@InterfaceAudience.Private
- public boolean waitForMetaOnline() {
+ public boolean waitForMetaOnline() throws IOException {
return isRegionOnline(RegionInfoBuilder.FIRST_META_REGIONINFO);
}
/**
+ * Wait until the region is reported online on a live regionserver.
+ * @param ri Region info.
* @return True if region is online and scannable else false if an error or
shutdown (Otherwise we
* just block in here holding up all forward-progess).
+ * @throws IOException If the master restart is required.
*/
- private boolean isRegionOnline(RegionInfo ri) {
+ private boolean isRegionOnline(RegionInfo ri) throws IOException {
RetryCounter rc = null;
while (!isStopped()) {
RegionState rs =
this.assignmentManager.getRegionStates().getRegionState(ri);
if (rs != null && rs.isOpened()) {
if (this.getServerManager().isServerOnline(rs.getServerName())) {
return true;
+ } else {
+ LOG.info("{} has state {} but the server {} is not online,
scheduling recovery.",
+ ri.getRegionNameAsString(), rs, rs.getServerName());
+ this.getServerManager().expireServer(rs.getServerName(), true);
+ // If already many SCPs are scheduled, but they are not progressing
because of
+ // meta's unavailability, the best action item is to throw
PleaseRestartMasterException
+ // and let new active master init take care of on-lining meta and
process all other
+ // pending SCPs. It's worth waiting for ~20s before arriving at the
conclusion, rather
+ // than looping through procedures to figure out how/when/why they
are able to or not
+ // able to make any progress and eventually abort master
initialization anyway.
+ Threads.sleep(20000);
+ rs = this.assignmentManager.getRegionStates().getRegionState(ri);
+ if (rs != null && rs.isOpened()) {
+ if (this.getServerManager().isServerOnline(rs.getServerName())) {
+ return true;
+ } else {
+ throw new PleaseRestartMasterException("meta is still not online
on live server yet");
Review Comment:
Tried improving this overall in the latest revision.
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