HDDS-1531. Disable the sync flag by default during chunk writes in Datanode.

[bshashikant]

No description provided.

[mukul1987]

+1, the changes look good to me.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
0	reexec	43	Docker mode activated.
		_ Prechecks _
+1	dupname	0	No case conflicting files found.
+1	@author	0	The patch does not contain any @author tags.
-1	test4tests	0	The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.
		_ trunk Compile Tests _
+1	mvninstall	410	trunk passed
+1	compile	197	trunk passed
+1	checkstyle	51	trunk passed
+1	mvnsite	0	trunk passed
+1	shadedclient	901	branch has no errors when building and testing our client artifacts.
+1	javadoc	120	trunk passed
0	spotbugs	240	Used deprecated FindBugs config; considering switching to SpotBugs.
+1	findbugs	424	trunk passed
		_ Patch Compile Tests _
+1	mvninstall	398	the patch passed
+1	compile	201	the patch passed
+1	javac	201	the patch passed
+1	checkstyle	56	the patch passed
+1	mvnsite	0	the patch passed
+1	whitespace	0	The patch has no whitespace issues.
+1	xml	2	The patch has no ill-formed XML file.
+1	shadedclient	715	patch has no errors when building and testing our client artifacts.
+1	javadoc	121	the patch passed
+1	findbugs	443	the patch passed
		_ Other Tests _
-1	unit	149	hadoop-hdds in the patch failed.
-1	unit	1219	hadoop-ozone in the patch failed.
+1	asflicense	34	The patch does not generate ASF License warnings.
		5621

Reason	Tests
Failed junit tests	hadoop.ozone.container.TestContainerReplication
	hadoop.ozone.client.rpc.TestCloseContainerHandlingByClient

Subsystem	Report/Notes
Docker	Client=17.05.0-ce Server=17.05.0-ce base: https://builds.apache.org/job/hadoop-multibranch/job/PR-820/1/artifact/out/Dockerfile
GITHUB PR	#820
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient findbugs checkstyle xml
uname	Linux 4473a5d7ee5e 4.4.0-141-generic #167~14.04.1-Ubuntu SMP Mon Dec 10 13:20:24 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	personality/hadoop.sh
git revision	trunk / 2d8282b
Default Java	1.8.0_191
unit	https://builds.apache.org/job/hadoop-multibranch/job/PR-820/1/artifact/out/patch-unit-hadoop-hdds.txt
unit	https://builds.apache.org/job/hadoop-multibranch/job/PR-820/1/artifact/out/patch-unit-hadoop-ozone.txt
Test Results	https://builds.apache.org/job/hadoop-multibranch/job/PR-820/1/testReport/
Max. process+thread count	4591 (vs. ulimit of 5500)
modules	C: hadoop-hdds/common U: hadoop-hdds/common
Console output	https://builds.apache.org/job/hadoop-multibranch/job/PR-820/1/console
versions	git=2.7.4 maven=3.3.9 findbugs=3.1.0-RC1
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[mukul1987]

/retest

[bshashikant]

Thanks @mukul1987 for the review. I have committed this change to trunk.