Github user DT-Priyanka commented on a diff in the pull request:
https://github.com/apache/apex-malhar/pull/358#discussion_r73841763
--- Diff:
library/src/main/java/com/datatorrent/lib/db/jdbc/AbstractJdbcPollInputOperator.java
---
@@ -438,119 +261,110 @@ public void endWindow()
currentWindowRecoveryState = new MutablePair<>();
}
- public int getPartitionCount()
- {
- return partitionCount;
- }
-
- public void setPartitionCount(int partitionCount)
+ @Override
+ public void deactivate()
{
- this.partitionCount = partitionCount;
+ scanService.shutdownNow();
+ store.disconnect();
}
- @Override
- public void activate(Context cntxt)
+ protected void pollRecords()
{
- if (context.getValue(OperatorContext.ACTIVATION_WINDOW_ID) !=
Stateless.WINDOW_ID
- && context.getValue(OperatorContext.ACTIVATION_WINDOW_ID) <
windowManager.getLargestRecoveryWindow()) {
- // If it is a replay state, don't start any threads here
+ if (isPolled) {
return;
}
- }
-
- @Override
- public void deactivate()
- {
try {
- if (dbPoller != null && dbPoller.isAlive()) {
- dbPoller.interrupt();
- dbPoller.join();
+ ps.setFetchSize(getFetchSize());
+ ResultSet result = ps.executeQuery();
+ if (result.next()) {
+ do {
+ emitQueue.add(getTuple(result));
+ } while (result.next());
}
- } catch (InterruptedException ex) {
- // log and ignore, ending execution anyway
- LOG.error("exception in poller thread: ", ex);
+ isPolled = true;
+ } catch (SQLException ex) {
+ throw new RuntimeException(String.format("Error while running
query"), ex);
+ } finally {
+ store.disconnect();
}
- }
- @Override
- public void handleIdleTime()
- {
- if (execute) {
- try {
- Thread.sleep(spinMillis);
- } catch (InterruptedException ie) {
- throw new RuntimeException(ie);
- }
- } else {
- LOG.error("Exception: ", cause);
- DTThrowable.rethrow(cause.get());
- }
}
+ public abstract T getTuple(ResultSet result);
+
protected void replay(long windowId) throws SQLException
{
- isReplayed = true;
- MutablePair<String, String> recoveredData = new MutablePair<String,
String>();
try {
- recoveredData = (MutablePair<String,
String>)windowManager.load(operatorId, windowId);
+ MutablePair<Integer, Integer> recoveredData = (MutablePair<Integer,
Integer>)windowManager.load(operatorId,
+ windowId);
- if (recoveredData != null) {
- //skip the window and return if there was no incoming data in the
window
- if (recoveredData.left == null || recoveredData.right == null) {
- return;
- }
-
- if (recoveredData.right.equals(rangeQueryPair.getValue()) ||
recoveredData.right.equals(previousUpperBound)) {
- LOG.info("Matched so returning");
- return;
- }
+ if (recoveredData != null && shouldReplayWindow(recoveredData)) {
+ LOG.debug("[Recovering Window ID - {} for record range: {}, {}]",
windowId, recoveredData.left,
+ recoveredData.right);
- JdbcPollInputOperator jdbcPoller = new JdbcPollInputOperator();
- jdbcPoller.setStore(store);
- jdbcPoller.setKey(getKey());
- jdbcPoller.setPartitionCount(getPartitionCount());
- jdbcPoller.setPollInterval(getPollInterval());
- jdbcPoller.setTableName(getTableName());
- jdbcPoller.setBatchSize(getBatchSize());
- isPollable = false;
-
- LOG.debug("[Window ID -" + windowId + "," + recoveredData.left +
"," + recoveredData.right + "]");
+ ps = store.getConnection().prepareStatement(
+ buildRangeQuery(rangeQueryPair.getKey(),
(rangeQueryPair.getValue() - rangeQueryPair.getKey())),
+ TYPE_FORWARD_ONLY, CONCUR_READ_ONLY);
+ LOG.info("Query formed to recover data - {}", ps.toString());
- jdbcPoller.setRangeQueryPair(new KeyValPair<String,
String>(recoveredData.left, recoveredData.right));
+ emitReplayedTuples(ps);
- jdbcPoller.ps = jdbcPoller.store.getConnection().prepareStatement(
- JdbcMetaDataUtility.buildRangeQuery(jdbcPoller.getTableName(),
jdbcPoller.getKey(),
- jdbcPoller.getRangeQueryPair().getKey(),
jdbcPoller.getRangeQueryPair().getValue()),
- java.sql.ResultSet.TYPE_FORWARD_ONLY,
java.sql.ResultSet.CONCUR_READ_ONLY);
- LOG.info("Query formed for recovered data - {}",
jdbcPoller.ps.toString());
+ }
- emitReplayedTuples(jdbcPoller.ps);
+ if (currentWindowId == windowManager.getLargestRecoveryWindow()) {
+ try {
+ if (!isPollerPartition && rangeQueryPair.getValue() != null) {
+ ps = store.getConnection().prepareStatement(
+ buildRangeQuery(lastEmittedRecord,
(rangeQueryPair.getValue() - lastEmittedRecord)), TYPE_FORWARD_ONLY,
+ CONCUR_READ_ONLY);
+ } else {
+ Integer bound = null;
+ if (lastEmittedRecord == null) {
+ bound = rangeQueryPair.getKey();
+ } else {
+ bound = lastEmittedRecord;
+ }
+ ps =
store.getConnection().prepareStatement(buildRangeQuery(bound,
Integer.MAX_VALUE), TYPE_FORWARD_ONLY,
+ CONCUR_READ_ONLY);
+ }
+ scanService.scheduleAtFixedRate(new DBPoller(), 0, pollInterval,
TimeUnit.MILLISECONDS);
--- End diff --
If we don't start threads in "activate" method we want to do it in
beginWindow once "reply" is done.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
