/**
* Publish the scan metrics. For now, we use scan.setAttribute to pass the metrics back to the
* application or TableInputFormat.Later, we could push it to other systems. We don't use metrics
* framework because it doesn't support multi-instances of the same metrics on the same machine;
* for scan/map reduce scenarios, we will have multiple scans running at the same time.
*
* <p>By default, scan metrics are disabled; if the application wants to collect them, this
* behavior can be turned on by calling calling:
*
* <p>scan.setAttribute(SCAN_ATTRIBUTES_METRICS_ENABLE, Bytes.toBytes(Boolean.TRUE))
*/
protected void writeScanMetrics() {
if (this.scanMetrics == null || scanMetricsPublished) {
return;
}
MapReduceProtos.ScanMetrics pScanMetrics = ProtobufUtil.toScanMetrics(scanMetrics);
scan.setAttribute(Scan.SCAN_ATTRIBUTES_METRICS_DATA, pScanMetrics.toByteArray());
scanMetricsPublished = true;
}
