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https://issues.apache.org/jira/browse/HBASE-27637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17689322#comment-17689322
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Hudson commented on HBASE-27637:
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Results for branch branch-2.5
[build #300 on
builds.a.o|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.5/300/]:
(/) *{color:green}+1 overall{color}*
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details (if available):
(/) {color:green}+1 general checks{color}
-- For more information [see general
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.5/300/General_20Nightly_20Build_20Report/]
(/) {color:green}+1 jdk8 hadoop2 checks{color}
-- For more information [see jdk8 (hadoop2)
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.5/300/JDK8_20Nightly_20Build_20Report_20_28Hadoop2_29/]
(/) {color:green}+1 jdk8 hadoop3 checks{color}
-- For more information [see jdk8 (hadoop3)
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.5/300/JDK8_20Nightly_20Build_20Report_20_28Hadoop3_29/]
(/) {color:green}+1 jdk11 hadoop3 checks{color}
-- For more information [see jdk11
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(/) {color:green}+1 source release artifact{color}
-- See build output for details.
(/) {color:green}+1 client integration test{color}
> Zero length value would cause value compressor read nothing and not advance
> the position of the InputStream
> -----------------------------------------------------------------------------------------------------------
>
> Key: HBASE-27637
> URL: https://issues.apache.org/jira/browse/HBASE-27637
> Project: HBase
> Issue Type: Bug
> Components: dataloss, wal
> Reporter: Duo Zhang
> Assignee: Duo Zhang
> Priority: Critical
> Fix For: 2.6.0, 3.0.0-alpha-4, 2.5.4
>
>
> This is a code sniff from the discussion of HBASE-27073
> {code}
> public static void main(String[] args) throws Exception {
> CompressionContext ctx =
> new CompressionContext(LRUDictionary.class, false, false, true,
> Compression.Algorithm.GZ);
> ValueCompressor compressor = ctx.getValueCompressor();
> byte[] compressed = compressor.compress(new byte[0], 0, 0);
> System.out.println("compressed length: " + compressed.length);
> ByteArrayInputStream bis = new ByteArrayInputStream(compressed);
> int read = compressor.decompress(bis, compressed.length, new byte[0], 0,
> 0);
> System.out.println("read length: " + read);
> System.out.println("position: " + (compressed.length - bis.available()));
> {code}
> And the output is
> {noformat}
> compressed length: 20
> read length: 0
> position: 0
> {noformat}
> So it turns out that, when compressing, an empty array will still generate
> some output bytes but while reading, we will skip reading anything if we find
> the output length is zero, so next time when we read from the stream, we will
> start at a wrong position...
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