lokeshj1703 commented on a change in pull request #2578:
URL: https://github.com/apache/ozone/pull/2578#discussion_r723119882
##########
File path:
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/container/balancer/ContainerBalancer.java
##########
@@ -185,7 +185,9 @@ private void balance() {
for (int i = 0; i < idleIteration && balancerRunning; i++) {
// stop balancing if iteration is not initialized
if (!initializeIteration()) {
- stop();
+ if (isBalancerRunning()) {
+ stop();
Review comment:
Why do we need isBalancerRunning check before calling stop method? It
should be ok to call stop directly.
##########
File path:
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/container/balancer/ContainerBalancer.java
##########
@@ -364,10 +376,15 @@ private IterationResult doIteration() {
// match each overUtilized node with a target
for (DatanodeUsageInfo datanodeUsageInfo : overUtilizedNodes) {
+ if (!balancerRunning) {
+ checkIterationMoveResults();
+ return IterationResult.ITERATION_INTERRUPTED;
+ }
Review comment:
I would recommend moving this to a separate function for checking
balancer status.
Instead of calling `checkIterationMoveResults` multiple times, maybe throw
InterruptedException in the new function.
```
doIteration {
try {
checkBalancerStatus();
...
} catch (InterrupedException e) {
return IterationResult.ITERATION_INTERRUPTED;
} finally {
checkIterationMoveResults();
}
}
```
##########
File path:
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/container/balancer/ContainerBalancer.java
##########
@@ -185,7 +185,9 @@ private void balance() {
for (int i = 0; i < idleIteration && balancerRunning; i++) {
// stop balancing if iteration is not initialized
if (!initializeIteration()) {
- stop();
+ if (isBalancerRunning()) {
Review comment:
Why would this lead to deadlock? We only have one lock in balancer.
If stop is called multiple times, all subsequent calls should be quick to
execute.
##########
File path:
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/container/balancer/ContainerBalancer.java
##########
@@ -185,7 +185,9 @@ private void balance() {
for (int i = 0; i < idleIteration && balancerRunning; i++) {
// stop balancing if iteration is not initialized
if (!initializeIteration()) {
- stop();
+ if (isBalancerRunning()) {
+ stop();
Review comment:
This check is made at multiple places. I think we can avoid this check.
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