joshelser commented on a change in pull request #2191:
URL: https://github.com/apache/hbase/pull/2191#discussion_r487113596
##########
File path:
hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSourceShipper.java
##########
@@ -324,4 +326,51 @@ void stopWorker() {
public boolean isFinished() {
return state == WorkerState.FINISHED;
}
+
+ /**
+ * Attempts to properly update
<code>ReplicationSourceManager.totalBufferUser</code>,
+ * in case there were unprocessed entries batched by the reader to the
shipper,
+ * but the shipper didn't manage to ship those because the replication
source is being terminated.
+ * In that case, it iterates through the batched entries and decrease the
pending
+ * entries size from <code>ReplicationSourceManager.totalBufferUser</code>
+ * <p/>
+ * <b>NOTES</b>
+ * 1) This method should only be called upon replication source termination.
+ * It blocks waiting for both shipper and reader threads termination,
+ * to make sure no race conditions
+ * when updating <code>ReplicationSourceManager.totalBufferUser</code>.
+ *
+ * 2) It <b>does not</b> attempt to terminate reader and shipper threads.
Those <b>must</b>
+ * have been triggered interruption/termination prior to calling this method.
+ */
+ void clearWALEntryBatch() {
+ long timeout = System.currentTimeMillis() + this.shipEditsTimeout;
+ while(this.isAlive() || this.entryReader.isAlive()){
+ try {
+ if (System.currentTimeMillis() >= timeout) {
+ LOG.warn("Interrupting source thread for peer {} without cleaning
buffer usage "
+ + "because clearWALEntryBatch method timed out whilst waiting
reader/shipper "
+ + "thread to stop.", this.source.getPeerId());
+ Thread.currentThread().interrupt();
+ } else {
+ // Wait both shipper and reader threads to stop
+ Thread.sleep(this.sleepForRetries);
+ }
+ } catch (InterruptedException e) {
+ LOG.warn("{} Interrupted while waiting {} to stop on
clearWALEntryBatch: {}",
+ this.source.getPeerId(), this.getName(), e);
+ Thread.currentThread().interrupt();
+ }
+ }
+ LongAccumulator totalToDecrement = new LongAccumulator((a,b) -> a + b, 0);
+ entryReader.entryBatchQueue.forEach(w -> {
+ entryReader.entryBatchQueue.remove(w);
+ w.getWalEntries().forEach(e -> {
+ long entrySizeExcludeBulkLoad =
entryReader.getEntrySizeExcludeBulkLoad(e);
+ totalToDecrement.accumulate(entrySizeExcludeBulkLoad);
+ });
+ });
+
+
source.getSourceManager().getTotalBufferUsed().addAndGet(-totalToDecrement.longValue());
Review comment:
Thanks for updating the decrement logic.
Maybe a TRACE log message to indicate the amount of buffer reclaimed as a
part of shutting down. Sounds like that might be helpful in the future. e.g.
`LOG.trace("Decrementing totalBufferUsed by {}B while stopping Replication
WAL Readers", totalToDecrement.longValue())`
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