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https://issues.apache.org/jira/browse/HBASE-10564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13904326#comment-13904326
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Jean-Marc Spaggiari commented on HBASE-10564:
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This method is not used anywhere. Probably an old left over never detected
because of the recursion.
I compared with a one year old version, and it was already not used anymore.
+1 to remove it.
> HRegionServer.nextLong should be removed since it's not used anywhere, or
> should be used somewhere it meant to
> --------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-10564
> URL: https://issues.apache.org/jira/browse/HBASE-10564
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Reporter: Feng Honghua
> Assignee: Feng Honghua
> Priority: Minor
> Attachments: HBASE-10564-trunk_v1.patch
>
>
> HRegionServer has its own nextLong method as below:
> {code}
> /**
> * Generate a random positive long number
> *
> * @return a random positive long number
> */
> protected long nextLong() {
> long n = rand.nextLong();
> if (n == 0) {
> return nextLong();
> }
> if (n < 0) {
> n = -n;
> }
> return n;
> }
> {code}
> # It's never called anywhere, if we can ensure it's really useless, it should
> be removed
> # Looks likely below should use *nextLong* rather than *rand.nextLong*(but
> not sure):
> {code}
> protected long addScanner(RegionScanner s, HRegion r) throws
> LeaseStillHeldException {
> long scannerId = -1;
> while (true) {
> scannerId = Math.abs(rand.nextLong() << 24) ^ startcode;
> String scannerName = String.valueOf(scannerId);
> RegionScannerHolder existing =
> scanners.putIfAbsent(scannerName, new RegionScannerHolder(s, r));
> if (existing == null) {
> this.leases.createLease(scannerName, this.scannerLeaseTimeoutPeriod,
> new ScannerListener(scannerName));
> break;
> }
> }
> return scannerId;
> }
> {code}
> # Its implemenation would be better if
> {code}
> if (n == 0) {
> return nextLong();
> }
> {code}
> is changed to below (with better readability and (possible) less call-stacks
> by removing recursion)
> {code}
> while (n == 0) {
> n = rand.nextLong();
> }
> {code}
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