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https://issues.apache.org/jira/browse/HBASE-17623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15871146#comment-15871146
 ] 

Hadoop QA commented on HBASE-17623:
-----------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 10m 31s 
{color} | {color:blue} Docker mode activated. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m 0s 
{color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m 
0s {color} | {color:green} The patch appears to include 3 new or modified test 
files. {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 18s 
{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 1m 
43s {color} | {color:green} branch-1 passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 41s 
{color} | {color:green} branch-1 passed with JDK v1.8.0_121 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 48s 
{color} | {color:green} branch-1 passed with JDK v1.7.0_80 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 
43s {color} | {color:green} branch-1 passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
26s {color} | {color:green} branch-1 passed {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red} 1m 48s 
{color} | {color:red} hbase-server in branch-1 has 2 extant Findbugs warnings. 
{color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 36s 
{color} | {color:green} branch-1 passed with JDK v1.8.0_121 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 50s 
{color} | {color:green} branch-1 passed with JDK v1.7.0_80 {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m 12s 
{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 
58s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 42s 
{color} | {color:green} the patch passed with JDK v1.8.0_121 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 42s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 49s 
{color} | {color:green} the patch passed with JDK v1.7.0_80 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 49s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 
45s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
27s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m 
0s {color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} hadoopcheck {color} | {color:green} 
14m 46s {color} | {color:green} The patch does not cause any errors with Hadoop 
2.4.0 2.4.1 2.5.0 2.5.1 2.5.2 2.6.1 2.6.2 2.6.3 2.7.1. {color} |
| {color:green}+1{color} | {color:green} hbaseprotoc {color} | {color:green} 0m 
26s {color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red} 0m 54s 
{color} | {color:red} hbase-common generated 1 new + 0 unchanged - 0 fixed = 1 
total (was 0) {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 34s 
{color} | {color:green} the patch passed with JDK v1.8.0_121 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 47s 
{color} | {color:green} the patch passed with JDK v1.7.0_80 {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 1m 51s 
{color} | {color:green} hbase-common in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 20m 16s {color} 
| {color:red} hbase-server in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 
17s {color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 65m 35s {color} 
| {color:black} {color} |
\\
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|| Reason || Tests ||
| FindBugs | module:hbase-common |
|  |  org.apache.hadoop.hbase.util.Bytes.equals(Object) checks for operand 
being a byte[]   At Bytes.java:a byte[]   At Bytes.java:[line 267] |
| Failed junit tests | hadoop.hbase.ipc.TestSimpleRpcScheduler |
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\\
|| Subsystem || Report/Notes ||
| Docker | Client=1.12.3 Server=1.12.3 Image:yetus/hbase:e01ee2f |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12853196/HBASE-17623.branch-1.v0.patch
 |
| JIRA Issue | HBASE-17623 |
| Optional Tests |  asflicense  javac  javadoc  unit  findbugs  hadoopcheck  
hbaseanti  checkstyle  compile  |
| uname | Linux f0476c31f72e 4.4.0-43-generic #63-Ubuntu SMP Wed Oct 12 
13:48:03 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/hbase.sh |
| git revision | branch-1 / 4038917 |
| Default Java | 1.7.0_80 |
| Multi-JDK versions |  /usr/lib/jvm/java-8-oracle:1.8.0_121 
/usr/lib/jvm/java-7-oracle:1.7.0_80 |
| findbugs | v3.0.0 |
| findbugs | 
https://builds.apache.org/job/PreCommit-HBASE-Build/5747/artifact/patchprocess/branch-findbugs-hbase-server-warnings.html
 |
| findbugs | 
https://builds.apache.org/job/PreCommit-HBASE-Build/5747/artifact/patchprocess/new-findbugs-hbase-common.html
 |
| unit | 
https://builds.apache.org/job/PreCommit-HBASE-Build/5747/artifact/patchprocess/patch-unit-hbase-server.txt
 |
| unit test logs |  
https://builds.apache.org/job/PreCommit-HBASE-Build/5747/artifact/patchprocess/patch-unit-hbase-server.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HBASE-Build/5747/testReport/ |
| modules | C: hbase-common hbase-server U: . |
| Console output | 
https://builds.apache.org/job/PreCommit-HBASE-Build/5747/console |
| Powered by | Apache Yetus 0.3.0   http://yetus.apache.org |


This message was automatically generated.



> Reuse the bytes array when building the hfile block
> ---------------------------------------------------
>
>                 Key: HBASE-17623
>                 URL: https://issues.apache.org/jira/browse/HBASE-17623
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: ChiaPing Tsai
>            Assignee: ChiaPing Tsai
>            Priority: Minor
>             Fix For: 2.0.0, 1.4.0
>
>         Attachments: after(snappy_hfilesize=5.04GB).png, 
> after(snappy_hfilesize=755MB).png, before(snappy_hfilesize=5.04GB).png, 
> before(snappy_hfilesize=755MB).png, HBASE-17623.branch-1.v0.patch, 
> HBASE-17623.v0.patch, HBASE-17623.v1.patch, HBASE-17623.v1.patch, memory 
> allocation measurement.xlsx
>
>
> There are two improvements.
> # The uncompressedBlockBytesWithHeader and onDiskBlockBytesWithHeader should 
> maintain a bytes array which can be reused when building the hfile.
> # The uncompressedBlockBytesWithHeader/onDiskBlockBytesWithHeader is copied 
> to an new bytes array only when we need to cache the block.
> {code:title=HFileBlock.java|borderStyle=solid}
>     private void finishBlock() throws IOException {
>       if (blockType == BlockType.DATA) {
>         this.dataBlockEncoder.endBlockEncoding(dataBlockEncodingCtx, 
> userDataStream,
>             baosInMemory.getBuffer(), blockType);
>         blockType = dataBlockEncodingCtx.getBlockType();
>       }
>       userDataStream.flush();
>       // This does an array copy, so it is safe to cache this byte array when 
> cache-on-write.
>       // Header is still the empty, 'dummy' header that is yet to be filled 
> out.
>       uncompressedBlockBytesWithHeader = baosInMemory.toByteArray();
>       prevOffset = prevOffsetByType[blockType.getId()];
>       // We need to set state before we can package the block up for 
> cache-on-write. In a way, the
>       // block is ready, but not yet encoded or compressed.
>       state = State.BLOCK_READY;
>       if (blockType == BlockType.DATA || blockType == BlockType.ENCODED_DATA) 
> {
>         onDiskBlockBytesWithHeader = dataBlockEncodingCtx.
>             compressAndEncrypt(uncompressedBlockBytesWithHeader);
>       } else {
>         onDiskBlockBytesWithHeader = defaultBlockEncodingCtx.
>             compressAndEncrypt(uncompressedBlockBytesWithHeader);
>       }
>       // Calculate how many bytes we need for checksum on the tail of the 
> block.
>       int numBytes = (int) ChecksumUtil.numBytes(
>           onDiskBlockBytesWithHeader.length,
>           fileContext.getBytesPerChecksum());
>       // Put the header for the on disk bytes; header currently is 
> unfilled-out
>       putHeader(onDiskBlockBytesWithHeader, 0,
>           onDiskBlockBytesWithHeader.length + numBytes,
>           uncompressedBlockBytesWithHeader.length, 
> onDiskBlockBytesWithHeader.length);
>       // Set the header for the uncompressed bytes (for cache-on-write) -- 
> IFF different from
>       // onDiskBlockBytesWithHeader array.
>       if (onDiskBlockBytesWithHeader != uncompressedBlockBytesWithHeader) {
>         putHeader(uncompressedBlockBytesWithHeader, 0,
>           onDiskBlockBytesWithHeader.length + numBytes,
>           uncompressedBlockBytesWithHeader.length, 
> onDiskBlockBytesWithHeader.length);
>       }
>       if (onDiskChecksum.length != numBytes) {
>         onDiskChecksum = new byte[numBytes];
>       }
>       ChecksumUtil.generateChecksums(
>           onDiskBlockBytesWithHeader, 0, onDiskBlockBytesWithHeader.length,
>           onDiskChecksum, 0, fileContext.getChecksumType(), 
> fileContext.getBytesPerChecksum());
>     }{code}



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