TaskBatch<Void> tasks = new TaskBatch<Void>(entries.size());
for (Entry<HTableInterfaceReference, Collection<Mutation>> entry : entries) {
// get the mutations for each table. We leak the implementation here a little bit to save
// doing a complete copy over of all the index update for each table.
final List<Mutation> mutations = (List<Mutation>) entry.getValue();
final HTableInterfaceReference tableReference = entry.getKey();
/*
* Write a batch of index updates to an index table. This operation stops (is cancelable) via
* two mechanisms: (1) setting aborted or stopped on the IndexWriter or, (2) interrupting the
* running thread. The former will only work if we are not in the midst of writing the current
* batch to the table, though we do check these status variables before starting and before
* writing the batch. The latter usage, interrupting the thread, will work in the previous
* situations as was at some points while writing the batch, depending on the underlying
* writer implementation (HTableInterface#batch is blocking, but doesn't elaborate when is
* supports an interrupt).
*/
tasks.add(new Task<Void>() {
/**
* Do the actual write to the primary table. We don't need to worry about closing the table
* because that is handled the {@link CachingHTableFactory}.
*/
@Override
public Void call() throws Exception {
// this may have been queued, so another task infront of us may have failed, so we should
// early exit, if that's the case
throwFailureIfDone();
if (LOG.isDebugEnabled()) {
LOG.debug("Writing index update:" + mutations + " to table: " + tableReference);
}
try {
HTableInterface table = factory.getTable(tableReference.get());
throwFailureIfDone();
table.batch(mutations);
} catch (SingleIndexWriteFailureException e) {
throw e;
} catch (IOException e) {
throw new SingleIndexWriteFailureException(tableReference.toString(), mutations, e);
} catch (InterruptedException e) {
// reset the interrupt status on the thread
Thread.currentThread().interrupt();
throw new SingleIndexWriteFailureException(tableReference.toString(), mutations, e);
}
return null;
}
private void throwFailureIfDone() throws SingleIndexWriteFailureException {