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https://issues.apache.org/jira/browse/HBASE-17714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15891272#comment-15891272
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Andrew Purtell commented on HBASE-17714:
----------------------------------------
The release notes on HBASE-13090 say
{quote}
To ensure that timeout checks do not occur too often (which would hurt the
performance of scans), the configuration
"hbase.cells.scanned.per.heartbeat.check" has been introduced. This
configuration controls how often System.currentTimeMillis() is called to update
the progress towards the time limit. Currently, the default value of this
configuration value is 10000.
{quote}
> Client heartbeats seems to be broken
> ------------------------------------
>
> Key: HBASE-17714
> URL: https://issues.apache.org/jira/browse/HBASE-17714
> Project: HBase
> Issue Type: Bug
> Reporter: Samarth Jain
>
> We have a test in Phoenix where we introduce an artificial sleep of 2 times
> the RPC timeout in preScannerNext() hook of a co-processor.
> {code}
> public static class SleepingRegionObserver extends SimpleRegionObserver {
> public SleepingRegionObserver() {}
>
> @Override
> public boolean preScannerNext(final
> ObserverContext<RegionCoprocessorEnvironment> c,
> final InternalScanner s, final List<Result> results,
> final int limit, final boolean hasMore) throws IOException {
> try {
> if (SLEEP_NOW &&
> c.getEnvironment().getRegion().getRegionInfo().getTable().getNameAsString().equals(TABLE_NAME))
> {
> Thread.sleep(RPC_TIMEOUT * 2);
> }
> } catch (InterruptedException e) {
> throw new IOException(e);
> }
> return super.preScannerNext(c, s, results, limit, hasMore);
> }
> }
> {code}
> This test was passing fine till 1.1.3 but started failing sometime before
> 1.1.9 with an OutOfOrderScannerException. See PHOENIX-3702. [~lhofhansl]
> mentioned that we have client heartbeats enabled and that should prevent us
> from running into issues like this. FYI, this test fails with 1.2.3 version
> of HBase too.
> CC [~apurtell], [~jamestaylor]
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