while it does save power, it takes time to enter and exit C-states. Generally the higher theC-state, more power is saved when the processor is idle, but it takes longer to get the CPU back upagain when it is needed. The C-states are:

C0 The CPU is actively running code

C1 The CPU uses the HLT instruction when idle-the clock is gated off to parts of the core, but it is relatively quick to wake up

C1E This is actually just C1, except when C1E is enabled, the CPU lowers the CPU’s speed & voltage when it is in C1

C2 & up The CPU will shut off various parts of the core for greater power savings, at thecost of taking longer to wake up

In most Linux distributions today, C-states are enabled by default, which is great for most users. Theoperating system will choose which C-state to use based on processor utilization and other factors.Some users, though, want very low latency, and are very sensitive to how quickly a CPU can run codewhen needed, so user control is desired.

java.net.UnknownHostException: googleplus001: unknown error
    at java.net.InetAddress.getLocalHost(InetAddress.java:1505)

if you want control over C-states, or if your system might have CPUs that are newerthan the version of intel_idle in your kernel, you should use kernel parameter "intel_idle.max_cstate=0" to disable this driver.

$ dmesg | grep -i intel_idle

$ cat /proc/acpi/processor/CPU0/power

active state:            C0

max_cstate:              C1

maximum allowed latency: 2000000000 usec

states:

$ vi ~/.hiverc

..

add jar /위치/json-serde-1.3.7-jar-with-dependencies.jar

FAILED: ParseException line 1:85 Failed to recognize predicate 'to'. Failed rule: 'identifier' in table or column identifier

SET hive.support.sql11.reserved.keywords=false;

select * from src.google_plus_log where date_id='2037-02-22' and to='365600561231231123121212'

$ free

                     total       used              free         shared    buffers     cached

Mem:      16289804   15621900     667904        188     148776    7787380

-/+ buffers/cache:     7685744      8604060

Swap:     10485756          0            10485756

$ top

Mem:  16289804k total, 15621300k used,   668504k free,   148776k buffers

Swap: 10485756k total,        0k used, 10485756k free,  7787328k cached

PID USER      PR   NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND

17075 www    20   0 12.8g 6.7g 6512 S  0.7        43.2   4321:34 mongod

The Java client driver 3.1.4 (branch 3.1) is compatible with Apache Cassandra 1.2, 2.0, 2.1, 2.2 and 3.0 (see this pagefor the most up-to-date compatibility information).

Native protocol

The native protocol defines the format of the binary messages exchanged between the driver and Cassandra over TCP. As a driver user, you don’t need to know the fine details (although the protocol spec is in the Cassandra codebase if you’re curious); the most visible aspect is that some features are only available with specific protocol versions.

Compatibility matrix

By default, the protocol version is negotiated between the driver and Cassandra when the first connection is established. Both sides are backward-compatible with older versions:

long startDate = row.getDate("date1").getTime();

 (188): Codec not found for requested operation: [timestamp <-> com.datastax.driver.core.LocalDate]

com.datastax.driver.core.exceptions.CodecNotFoundException: Codec not found for requested operation: [timestamp <-> com.datastax.driver.core.LocalDate]

        at com.datastax.driver.core.CodecRegistry.notFound(CodecRegistry.java:679) ~[story-app.jar:na]

        at com.datastax.driver.core.CodecRegistry.createCodec(CodecRegistry.java:526) ~[story-app.jar:na]

        at com.datastax.driver.core.CodecRegistry.findCodec(CodecRegistry.java:506) ~[story-app.jar:na]

        at com.datastax.driver.core.CodecRegistry.access$200(CodecRegistry.java:140) ~[story-app.jar:na]

        at com.datastax.driver.core.CodecRegistry$TypeCodecCacheLoader.load(CodecRegistry.java:211) ~[story-app.jar:na]

        at com.datastax.driver.core.CodecRegistry$TypeCodecCacheLoader.load(CodecRegistry.java:208) ~[story-app.jar:na]

        at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3524) ~[story-app.jar:na]

        at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2317) ~[story-app.jar:na]

        at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2280) ~[story-app.jar:na]

        at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2195) ~[story-app.jar:na]

        at com.google.common.cache.LocalCache.get(LocalCache.java:3934) ~[story-app.jar:na]

        at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3938) ~[story-app.jar:na]

        at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4821) ~[story-app.jar:na]

        at com.datastax.driver.core.CodecRegistry.lookupCodec(CodecRegistry.java:480) ~[story-app.jar:na]

        at com.datastax.driver.core.CodecRegistry.codecFor(CodecRegistry.java:448) ~[story-app.jar:na]

        at com.datastax.driver.core.CodecRegistry.codecFor(CodecRegistry.java:430) ~[story-app.jar:na]

        at com.datastax.driver.core.AbstractGettableByIndexData.codecFor(AbstractGettableByIndexData.java:69) ~[story-app.jar:na]

        at com.datastax.driver.core.AbstractGettableByIndexData.getDate(AbstractGettableByIndexData.java:174) ~[story-app.jar:na]

        at com.datastax.driver.core.AbstractGettableData.getDate(AbstractGettableData.java:26) ~[story-app.jar:na]

        at com.datastax.driver.core.AbstractGettableData.getDate(AbstractGettableData.java:111) ~[story-app.jar:na]

row.getTimestamp("date1").getTime();

[INFO] +- com.datastax.cassandra:cassandra-driver-core:jar:3.1.3:compile

[INFO] |  +- io.netty:netty-handler:jar:4.0.37.Final:compile

[INFO] |  |  +- io.netty:netty-buffer:jar:4.0.37.Final:compile

[INFO] |  |  |  \- io.netty:netty-common:jar:4.0.37.Final:compile

[INFO] |  |  +- io.netty:netty-transport:jar:4.0.37.Final:compile

[INFO] |  |  |  \- (io.netty:netty-buffer:jar:4.0.37.Final:compile)

[INFO] |  |  \- io.netty:netty-codec:jar:4.0.37.Final:compile

[INFO] |  |     \- (io.netty:netty-transport:jar:4.0.37.Final:compile)

[INFO] |  +- (com.google.guava:guava:jar:16.0.1:compile)

[INFO] |  +- io.dropwizard.metrics:metrics-core:jar:3.1.2:compile

[INFO] |  |  \- (org.slf4j:slf4j-api:jar:1.7.7:compile - omitted for conflict with 1.7.6)

[INFO] |  +- com.github.jnr:jnr-ffi:jar:2.0.7:compile

[INFO] |  |  +- com.github.jnr:jffi:jar:1.2.10:compile

[INFO] |  |  +- com.github.jnr:jffi:jar:native:1.2.10:runtime

[INFO] |  |  +- (org.ow2.asm:asm:jar:5.0.3:compile - omitted for conflict with 4.1)

[INFO] |  |  +- (org.ow2.asm:asm-commons:jar:5.0.3:compile - omitted for conflict with 4.1)

[INFO] |  |  +- org.ow2.asm:asm-analysis:jar:5.0.3:compile

[INFO] |  |  |  \- (org.ow2.asm:asm-tree:jar:5.0.3:compile)

[INFO] |  |  +- org.ow2.asm:asm-tree:jar:5.0.3:compile

[INFO] |  |  |  \- (org.ow2.asm:asm:jar:5.0.3:compile - omitted for conflict with 4.1)

[INFO] |  |  +- org.ow2.asm:asm-util:jar:5.0.3:compile

[INFO] |  |  |  \- (org.ow2.asm:asm-tree:jar:5.0.3:compile)

[INFO] |  |  \- com.github.jnr:jnr-x86asm:jar:1.0.2:compile

[INFO] |  \- com.github.jnr:jnr-posix:jar:3.0.27:compile

[INFO] |     +- (com.github.jnr:jnr-ffi:jar:2.0.7:compile)

[INFO] |     \- com.github.jnr:jnr-constants:jar:0.9.0:compile

[INFO] +- com.datastax.cassandra:cassandra-driver-core:jar:2.1.9:compile

[INFO] |  +- io.netty:netty-handler:jar:4.0.27.Final:compile

[INFO] |  |  +- io.netty:netty-buffer:jar:4.0.27.Final:compile

[INFO] |  |  |  \- io.netty:netty-common:jar:4.0.27.Final:compile

[INFO] |  |  +- io.netty:netty-transport:jar:4.0.27.Final:compile

[INFO] |  |  |  \- (io.netty:netty-buffer:jar:4.0.27.Final:compile)

[INFO] |  |  \- io.netty:netty-codec:jar:4.0.27.Final:compile

[INFO] |  |     \- (io.netty:netty-transport:jar:4.0.27.Final:compile)

[INFO] |  +- (com.google.guava:guava:jar:14.0.1:compile - omitted for conflict with 16.0.1)

[INFO] |  \- com.codahale.metrics:metrics-core:jar:3.0.2:compile

[INFO] |     \- (org.slf4j:slf4j-api:jar:1.7.5:compile - omitted for conflict with 1.7.6)

 if [ $(id -u) != "0" ]; then : ; else echo "superuser"; fi

$ echo ~+

/temp

$ echo ~-

/usr/local/redis/src

$ ./sleep.sh

echo 1

sleep 1

echo 1

sleep 1

echo 1

sleep 1

$./sleep.sh  &

$ stty tostop

[1]+  Stopped                 ./sleep.sh