[GitHub] [hbase] sandeepvinayak commented on a change in pull request #3376: HBASE-25992 Polish the ReplicationSourceWALReader code for 2.x after …
sandeepvinayak commented on a change in pull request #3376:
URL: https://github.com/apache/hbase/pull/3376#discussion_r649673898
##
File path:
hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSourceWALReader.java
##
@@ -122,65 +122,51 @@ public ReplicationSourceWALReader(FileSystem fs,
Configuration conf,
@Override
public void run() {
int sleepMultiplier = 1;
-WALEntryBatch batch = null;
-WALEntryStream entryStream = null;
-try {
- // we only loop back here if something fatal happened to our stream
- while (isReaderRunning()) {
-try {
- entryStream =
-new WALEntryStream(logQueue, conf, currentPosition,
source.getWALFileLengthProvider(),
- source.getServerWALsBelongTo(), source.getSourceMetrics(),
walGroupId);
- while (isReaderRunning()) { // loop here to keep reusing stream
while we can
-if (!source.isPeerEnabled()) {
- Threads.sleep(sleepForRetries);
- continue;
-}
-if (!checkQuota()) {
- continue;
-}
-
-batch = createBatch(entryStream);
-batch = readWALEntries(entryStream, batch);
+while (isReaderRunning()) { // we only loop back here if something fatal
happened to our stream
+ WALEntryBatch batch = null;
+ try (WALEntryStream entryStream =
+ new WALEntryStream(logQueue, conf, currentPosition,
+ source.getWALFileLengthProvider(),
source.getServerWALsBelongTo(),
+ source.getSourceMetrics(), walGroupId)) {
+while (isReaderRunning()) { // loop here to keep reusing stream while
we can
+ batch = null;
+ if (!source.isPeerEnabled()) {
+Threads.sleep(sleepForRetries);
+continue;
+ }
+ if (!checkQuota()) {
+continue;
+ }
+ batch = tryAdvanceStreamAndCreateWALBatch(entryStream);
+ if (batch == null) {
+// got no entries and didn't advance position in WAL
+handleEmptyWALEntryBatch();
+entryStream.reset(); // reuse stream
+continue;
+ }
+ // if we have already switched a file, skip reading and put it
directly to the ship queue
+ if (!batch.isEndOfFile()) {
+readWALEntries(entryStream, batch);
currentPosition = entryStream.getPosition();
-if (batch == null) {
- // either the queue have no WAL to read
- // or got no new entries (didn't advance position in WAL)
- handleEmptyWALEntryBatch();
- entryStream.reset(); // reuse stream
-} else {
- addBatchToShippingQueue(batch);
-}
}
-} catch (WALEntryFilterRetryableException | IOException e) { // stream
related
- if (handleEofException(e, batch)) {
-sleepMultiplier = 1;
- } else {
-LOG.warn("Failed to read stream of replication entries "
- + "or replication filter is recovering", e);
-if (sleepMultiplier < maxRetriesMultiplier) {
- sleepMultiplier++;
-}
-Threads.sleep(sleepForRetries * sleepMultiplier);
+ // need to propagate the batch even it has no entries since it may
carry the last
+ // sequence id information for serial replication.
+ LOG.debug("Read {} WAL entries eligible for replication",
batch.getNbEntries());
+ entryBatchQueue.put(batch);
+ sleepMultiplier = 1;
+}
+ } catch (IOException e) { // stream related
+if (!handleEofException(e, batch)) {
Review comment:
I believe `handleEofException` returns true if are able to gracefully
recover from a bad empty WAL which means we recovered from the exception so at
that point resetting the sleep multiplier makes sense. What do you think?
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[GitHub] [hbase] sandeepvinayak commented on a change in pull request #3376: HBASE-25992 Polish the ReplicationSourceWALReader code for 2.x after …
sandeepvinayak commented on a change in pull request #3376:
URL: https://github.com/apache/hbase/pull/3376#discussion_r649435799
##
File path:
hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSourceWALReader.java
##
@@ -270,43 +236,63 @@ private void handleEmptyWALEntryBatch() throws
InterruptedException {
}
}
+ private WALEntryBatch tryAdvanceStreamAndCreateWALBatch(WALEntryStream
entryStream)
+throws IOException {
+Path currentPath = entryStream.getCurrentPath();
+if (!entryStream.hasNext()) {
+ // check whether we have switched a file
+ if (currentPath != null && switched(entryStream, currentPath)) {
+return WALEntryBatch.endOfFile(currentPath);
+ } else {
+return null;
+ }
+}
+if (currentPath != null) {
+ if (switched(entryStream, currentPath)) {
+return WALEntryBatch.endOfFile(currentPath);
+ }
+}
+return createBatch(entryStream);
+ }
+
/**
* This is to handle the EOFException from the WAL entry stream.
EOFException should
* be handled carefully because there are chances of data loss because of
never replicating
* the data. Thus we should always try to ship existing batch of entries
here.
* If there was only one log in the queue before EOF, we ship the empty
batch here
* and since reader is still active, in the next iteration of reader we will
* stop the reader.
+ *
* If there was more than one log in the queue before EOF, we ship the
existing batch
* and reset the wal patch and position to the log with EOF, so shipper can
remove
* logs from replication queue
* @return true only the IOE can be handled
*/
- private boolean handleEofException(Exception e, WALEntryBatch batch)
- throws InterruptedException {
+ private boolean handleEofException(Exception e, WALEntryBatch batch) {
PriorityBlockingQueue queue = logQueue.getQueue(walGroupId);
// Dump the log even if logQueue size is 1 if the source is from recovered
Source
// since we don't add current log to recovered source queue so it is safe
to remove.
-if ((e instanceof EOFException || e.getCause() instanceof EOFException)
- && (source.isRecovered() || queue.size() > 1)
- && this.eofAutoRecovery) {
+if ((e instanceof EOFException || e.getCause() instanceof EOFException) &&
+ (source.isRecovered() || queue.size() > 1) && this.eofAutoRecovery) {
Path head = queue.peek();
try {
if (fs.getFileStatus(head).getLen() == 0) {
// head of the queue is an empty log file
LOG.warn("Forcing removal of 0 length log in queue: {}", head);
logQueue.remove(walGroupId);
currentPosition = 0;
- // After we removed the WAL from the queue, we should
- // try shipping the existing batch of entries and set the wal
position
- // and path to the wal just dequeued to correctly remove logs from
the zk
- batch.setLastWalPath(head);
- batch.setLastWalPosition(currentPosition);
- addBatchToShippingQueue(batch);
+ if (batch != null) {
+// After we removed the WAL from the queue, we should try shipping
the existing batch of
+// entries
+addBatchToShippingQueue(batch);
Review comment:
I don't think we need this now if we are sure that batch is empty since
the batch can only have one WAL's data.
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[GitHub] [hbase] sandeepvinayak commented on a change in pull request #3376: HBASE-25992 Polish the ReplicationSourceWALReader code for 2.x after …
sandeepvinayak commented on a change in pull request #3376:
URL: https://github.com/apache/hbase/pull/3376#discussion_r649431795
##
File path:
hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSourceWALReader.java
##
@@ -122,65 +122,51 @@ public ReplicationSourceWALReader(FileSystem fs,
Configuration conf,
@Override
public void run() {
int sleepMultiplier = 1;
-WALEntryBatch batch = null;
-WALEntryStream entryStream = null;
-try {
- // we only loop back here if something fatal happened to our stream
- while (isReaderRunning()) {
-try {
- entryStream =
-new WALEntryStream(logQueue, conf, currentPosition,
source.getWALFileLengthProvider(),
- source.getServerWALsBelongTo(), source.getSourceMetrics(),
walGroupId);
- while (isReaderRunning()) { // loop here to keep reusing stream
while we can
-if (!source.isPeerEnabled()) {
- Threads.sleep(sleepForRetries);
- continue;
-}
-if (!checkQuota()) {
- continue;
-}
-
-batch = createBatch(entryStream);
-batch = readWALEntries(entryStream, batch);
+while (isReaderRunning()) { // we only loop back here if something fatal
happened to our stream
+ WALEntryBatch batch = null;
+ try (WALEntryStream entryStream =
+ new WALEntryStream(logQueue, conf, currentPosition,
+ source.getWALFileLengthProvider(),
source.getServerWALsBelongTo(),
+ source.getSourceMetrics(), walGroupId)) {
+while (isReaderRunning()) { // loop here to keep reusing stream while
we can
+ batch = null;
+ if (!source.isPeerEnabled()) {
+Threads.sleep(sleepForRetries);
+continue;
+ }
+ if (!checkQuota()) {
+continue;
+ }
+ batch = tryAdvanceStreamAndCreateWALBatch(entryStream);
+ if (batch == null) {
+// got no entries and didn't advance position in WAL
+handleEmptyWALEntryBatch();
+entryStream.reset(); // reuse stream
+continue;
+ }
+ // if we have already switched a file, skip reading and put it
directly to the ship queue
+ if (!batch.isEndOfFile()) {
+readWALEntries(entryStream, batch);
currentPosition = entryStream.getPosition();
-if (batch == null) {
- // either the queue have no WAL to read
- // or got no new entries (didn't advance position in WAL)
- handleEmptyWALEntryBatch();
- entryStream.reset(); // reuse stream
-} else {
- addBatchToShippingQueue(batch);
-}
}
-} catch (WALEntryFilterRetryableException | IOException e) { // stream
related
- if (handleEofException(e, batch)) {
-sleepMultiplier = 1;
- } else {
-LOG.warn("Failed to read stream of replication entries "
- + "or replication filter is recovering", e);
-if (sleepMultiplier < maxRetriesMultiplier) {
- sleepMultiplier++;
-}
-Threads.sleep(sleepForRetries * sleepMultiplier);
+ // need to propagate the batch even it has no entries since it may
carry the last
+ // sequence id information for serial replication.
+ LOG.debug("Read {} WAL entries eligible for replication",
batch.getNbEntries());
+ entryBatchQueue.put(batch);
+ sleepMultiplier = 1;
+}
+ } catch (IOException e) { // stream related
+if (!handleEofException(e, batch)) {
Review comment:
I think we need to reset the sleepMultiplier to 1 in the else part of
this.
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