OpenJDK is not recommended? Why
I am in process of setting 2 node cluster with C* version 2.0.4. When I started each node, it failed to communicate thus, each are running separate and not in same ring. So started looking at the log files are saw the message below: WARN [main] 2014-01-28 06:02:17,861 CassandraDaemon.java (line 155) OpenJDK is not recommended. Please upgrade to the newest Oracle Java release Is this message informational only or can it be real issue? Is this why, two nodes are not in a ring? -- Kumar
Re: OpenJDK is not recommended? Why
Open jdk has known issues and they will raise their ugly little head from time to time-i have experienced them myself. To be safe, I would use the latest oracle 7 release. You may also be experiencing a configuration issue, make sure one node is specified as the seed node and that the other node knows that address as well. There's a good guide to configuration on the datastax website. -- Colin +1 320 221 9531 > On Jan 28, 2014, at 9:55 PM, Kumar Ranjan wrote: > > I am in process of setting 2 node cluster with C* version 2.0.4. When I > started each node, it failed to communicate thus, each are running separate > and not in same ring. So started looking at the log files are saw the message > below: > > WARN [main] 2014-01-28 06:02:17,861 CassandraDaemon.java (line 155) OpenJDK > is not recommended. Please upgrade to the newest Oracle Java release > > Is this message informational only or can it be real issue? Is this why, two > nodes are not in a ring? > > -- Kumar
Re: OpenJDK is not recommended? Why
On 01/28/2014 09:55 PM, Kumar Ranjan wrote:
I am in process of setting 2 node cluster with C* version 2.0.4. When I
started each node, it failed to communicate thus, each are running
separate and not in same ring. So started looking at the log files are
saw the message below:
This is probably just a configuration issue and not likely to be the
fault of OpenJDK. OpenJDK is ok for testing the waters and light dev
work; it is the reference architecture for Oracle Java SE 7.
WARN [main] 2014-01-28 06:02:17,861 CassandraDaemon.java (line 155)
OpenJDK is not recommended. Please upgrade to the newest Oracle Java release
Is this message informational only or can it be real issue?
Source of the above warning has some comments (attached, so they don't
wrap so badly, I hope).
https://git-wip-us.apache.org/repos/asf?p=cassandra.git;a=blob;f=src/java/org/apache/cassandra/service/CassandraDaemon.java;h=424dbfa58ec72ea812362e2b428d0c4534626307;hb=HEAD#l106
--
Kind regards,
Michael
dc0bc878 (Jonathan Ellis 2013-03-07 18:08:59 + 106) // log
warnings for different kinds of sub-optimal JVMs. tldr use 64-bit Oracle >=
1.6u32
dc0bc878 (Jonathan Ellis 2013-03-07 18:08:59 + 107) if
(!System.getProperty("os.arch").contains("64"))
dc0bc878 (Jonathan Ellis 2013-03-07 18:08:59 + 108)
logger.info("32bit JVM detected. It is recommended to run Cassandra on a 64bit
JVM for better performance.");
d1e91a77 (Jonathan Ellis 2013-03-07 17:59:35 + 109) String
javaVersion = System.getProperty("java.version");
d1e91a77 (Jonathan Ellis 2013-03-07 17:59:35 + 110) String
javaVmName = System.getProperty("java.vm.name");
d1e91a77 (Jonathan Ellis 2013-03-07 17:59:35 + 111)
logger.info("JVM vendor/version: {}/{}", javaVmName, javaVersion);
d1e91a77 (Jonathan Ellis 2013-03-07 17:59:35 + 112) if
(javaVmName.contains("OpenJDK"))
d1e91a77 (Jonathan Ellis 2013-03-07 17:59:35 + 113) {
d1e91a77 (Jonathan Ellis 2013-03-07 17:59:35 + 114) //
There is essentially no QA done on OpenJDK builds, and
d1e91a77 (Jonathan Ellis 2013-03-07 17:59:35 + 115) //
clusters running OpenJDK have seen many heap and load issues.
d1e91a77 (Jonathan Ellis 2013-03-07 17:59:35 + 116)
logger.warn("OpenJDK is not recommended. Please upgrade to the newest Oracle
Java release");
d1e91a77 (Jonathan Ellis 2013-03-07 17:59:35 + 117) }
d1e91a77 (Jonathan Ellis 2013-03-07 17:59:35 + 118) else if
(!javaVmName.contains("HotSpot"))
d1e91a77 (Jonathan Ellis 2013-03-07 17:59:35 + 119) {
d1e91a77 (Jonathan Ellis 2013-03-07 17:59:35 + 120)
logger.warn("Non-Oracle JVM detected. Some features, such as immediate unmap
of compacted SSTables, may not work as intended");
d1e91a77 (Jonathan Ellis 2013-03-07 17:59:35 + 121) }
Re: OpenJDK is not recommended? Why
Yes got rid of openJDK and installed oracle version and warning went away. Happy happy...Thank you folks.. On Tue, Jan 28, 2014 at 11:59 PM, Michael Shuler wrote: > On 01/28/2014 09:55 PM, Kumar Ranjan wrote: > >> I am in process of setting 2 node cluster with C* version 2.0.4. When I >> started each node, it failed to communicate thus, each are running >> separate and not in same ring. So started looking at the log files are >> saw the message below: >> > > This is probably just a configuration issue and not likely to be the fault > of OpenJDK. OpenJDK is ok for testing the waters and light dev work; it is > the reference architecture for Oracle Java SE 7. > > > WARN [main] 2014-01-28 06:02:17,861 CassandraDaemon.java (line 155) >> OpenJDK is not recommended. Please upgrade to the newest Oracle Java >> release >> >> Is this message informational only or can it be real issue? >> > > Source of the above warning has some comments (attached, so they don't > wrap so badly, I hope). > > https://git-wip-us.apache.org/repos/asf?p=cassandra.git;a= > blob;f=src/java/org/apache/cassandra/service/CassandraDaemon.java;h= > 424dbfa58ec72ea812362e2b428d0c4534626307;hb=HEAD#l106 > > -- > Kind regards, > Michael > >
