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Posted to issues@hbase.apache.org by "samar (JIRA)" <ji...@apache.org> on 2013/05/31 13:50:20 UTC
[jira] [Updated] (HBASE-5110) code enhancement - remove unnecessary
if-checks in every loop in HLog class
[ https://issues.apache.org/jira/browse/HBASE-5110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
samar updated HBASE-5110:
-------------------------
Attachment: HBASE-5110_1.patch
> code enhancement - remove unnecessary if-checks in every loop in HLog class
> ---------------------------------------------------------------------------
>
> Key: HBASE-5110
> URL: https://issues.apache.org/jira/browse/HBASE-5110
> Project: HBase
> Issue Type: Improvement
> Components: wal
> Affects Versions: 0.90.1, 0.90.2, 0.90.4, 0.92.0
> Reporter: Mikael Sitruk
> Priority: Minor
> Attachments: HBASE-5110_1.patch
>
>
> The HLog class (method findMemstoresWithEditsEqualOrOlderThan) has unnecessary if check in a loop.
> static byte [][] findMemstoresWithEditsEqualOrOlderThan(final long oldestWALseqid,
> final Map<byte [], Long> regionsToSeqids) {
> // This method is static so it can be unit tested the easier.
> List<byte []> regions = null;
> for (Map.Entry<byte [], Long> e: regionsToSeqids.entrySet()) {
> if (e.getValue().longValue() <= oldestWALseqid) {
> if (regions == null) regions = new ArrayList<byte []>();
> regions.add(e.getKey());
> }
> }
> return regions == null?
> null: regions.toArray(new byte [][] {HConstants.EMPTY_BYTE_ARRAY});
> }
> The following change is suggested
> static byte [][] findMemstoresWithEditsEqualOrOlderThan(final long oldestWALseqid,
> final Map<byte [], Long> regionsToSeqids) {
> // This method is static so it can be unit tested the easier.
> List<byte []> regions = new ArrayList<byte []>();
> for (Map.Entry<byte [], Long> e: regionsToSeqids.entrySet()) {
> if (e.getValue().longValue() <= oldestWALseqid) {
> regions.add(e.getKey());
> }
> }
> return regions.size() == 0?
> null: regions.toArray(new byte [][] {HConstants.EMPTY_BYTE_ARRAY});
> }
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