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From "Wang, Xinglong (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-18764) add slow read block log entry to alert slow datanodeinfo when reading a block
Date Wed, 06 Sep 2017 06:46:02 GMT
Wang, Xinglong created HBASE-18764:

             Summary: add slow read block log entry to alert slow datanodeinfo when reading
a block
                 Key: HBASE-18764
                 URL: https://issues.apache.org/jira/browse/HBASE-18764
             Project: HBase
          Issue Type: Improvement
          Components: HFile
    Affects Versions: 1.1.12
            Reporter: Wang, Xinglong
            Priority: Minor

HBASE is on top of HDFS and both are distributed system. HBASE will also get impacted when
there is struggler datanode due to network/disk/cpu issue. All HBASE read/scan towards that
datanode will be slowdown. It's not easy for hbase admin to find out the struggler datanode
in such case.

While we have a log entry known as slow sync. One such entry is like the following. It will
help hbase admin to quickly identify the slow datanode in the pipline in case of network/disk/cup
issue with one of the 3 datanods in pipeline.

2017-07-08 19:11:30,538 INFO  [sync.3] wal.FSHLog: Slow sync cost: 490189 ms, current pipeline:
orage[xx.xx.xx.xx:50010,DS-21a85f8b-f389-4f9e-95a8-b711945fd210,DISK], DatanodeInfoWithStorage[xx.xx.xx.xx:50010,DS-aa48cef2-3554-482f-b49d-be4763f4d8b8,DISK]]

Inspired by slow sync log entry, I think it will also be beneficial for us to print out such
kind of entry when we encounter slow read case. So that it will be easy to identify the slow

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