taklwu commented on code in PR #4889:
URL: https://github.com/apache/hbase/pull/4889#discussion_r1028561464
##########
hbase-client/src/main/java/org/apache/hadoop/hbase/client/ConnectionImplementation.java:
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@@ -382,6 +390,24 @@ public void newDead(ServerName sn) {
default:
// Doing nothing
}
+
+ this.cachedMasterStateSupplier = Suppliers.memoizeWithExpiration(() -> {
+ if (this.masterServiceState.getStub() == null) {
+ return false;
+ }
+ try {
+ LOG.info("Getting master state using rpc call");
+ return this.masterServiceState.isMasterRunning();
+ } catch (UndeclaredThrowableException e) {
+ // It's somehow messy, but we can receive exceptions such as
+ // java.net.ConnectException but they're not declared. So we catch
it...
+ LOG.info("Master connection is not running anymore",
e.getUndeclaredThrowable());
+ return false;
+ } catch (IOException se) {
+ LOG.warn("Checking master connection", se);
+ return false;
+ }
+ }, conf.getLong(MASTER_STATE_CACHE_TIMEOUT_SEC, 30), TimeUnit.SECONDS);
Review Comment:
IMO we should default opt-out this feature without default to 0, then also
add a unit test to a connection related test to have the the timeout set to 30
and see if anything breaks.
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