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From Wojciech Indyk <wojciechin...@gmail.com>
Subject HBase monitoring
Date Wed, 24 Jun 2015 09:27:12 GMT
hello!
I try to monitor memory of my regionservers. I have HBase 0.98 on CDH 5.3.1.
I can see inconsistency between HBase metrics (here is metrics dump
from HBase UI):
"name" : "Hadoop:service=HBase,name=JvmMetrics",
    "modelerType" : "JvmMetrics",
    "tag.Context" : "jvm",
    "tag.ProcessName" : "IPC",
    "tag.SessionId" : "",
    "tag.Hostname" : "sqhadoop04.gazeta.pl",
    "MemNonHeapUsedM" : 93.26676,
    "MemNonHeapCommittedM" : 94.89844,
    "MemNonHeapMaxM" : -9.536743E-7,
    "MemHeapUsedM" : 8513.122,
    "MemHeapCommittedM" : 20330.25,
    "MemHeapMaxM" : 20330.25,
    "MemMaxM" : 20330.25,
and system "top" monitoring (all of my hbase processes on the regionserver):
PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
19700 hbase     20   0 22.3g  16g  23m S  1.3  8.7 479:47.53 java
19874 hbase     20   0  107m 2404  556 S  0.7  0.0   9:16.13 hbase.sh
19873 hbase     20   0  105m  908  556 S  0.0  0.0   0:00.00 hbase.sh

As we can see there is 16GB according to "top" and ~8.5GB according to
HBase. Why these values are different?

Kindly regards
Wojciech Indyk

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