HBase0.9x問題總結

1.最近hbase的rgion經常掛掉一個，查看該節點日誌發現如下錯誤：

2014-02-22 01:52:02,194 ERROR org.apache.Hadoop.hbase.regionserver.HRegionServer: Close and delete failed

org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException: org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException: No lease on /hbase/.logs/testhd3,60020,1392948100268/testhd3%2C60020%2C1392948100268.1393004989411 File does not exist. Holder DFSClient_hb_rs_testhd3,60020,1392948100268 does not have any open files.

at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkLease(FSNamesystem.java:1631)

at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkLease(FSNamesystem.java:1622)

查了很長時間也沒找到hbase的問題，後來根據網上資料查看了hadoop的日誌如下：

2014-02-22 01:52:00,935 ERROR org.apache.hadoop.security.UserGroupInformation: PriviledgedActionException as:hadoop cause:org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException: No lease on /hbase/.logs/testhd3,60020,1392948100268/testhd3%2C60020%2C1392948100268.1393004989411 File does not exist. Holder DFSClient_hb_rs_testhd3,60020,1392948100268 does not have any open files.

2014-02-22 01:52:00,936 INFO org.apache.hadoop.ipc.Server: IPC Server handler 3 on 9000, call addBlock(/hbase/.logs/testhd3,60020,1392948100268/testhd3%2C60020%2C1392948100268.1393004989411, DFSClient_hb_rs_testhd3,60020,1392948100268, null) from 172.72.101.213:59979: error: org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException: No lease on /hbase/.logs/testhd3,60020,1392948100268/testhd3%2C60020%2C1392948100268.1393004989411 File does not exist. Holder DFSClient_hb_rs_testhd3,60020,1392948100268 does not have any open files.

org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException: No lease on /hbase/.logs/testhd3,60020,1392948100268/testhd3%2C60020%2C1392948100268.1393004989411 File does not exist. Holder DFSClient_hb_rs_testhd3,60020,1392948100268 does not have any open files.

at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkLease(FSNamesystem.java:1631)

at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkLease(FSNamesystem.java:1622)

結果發現兩個日誌有幾乎相同的記錄，可以確認hbase的問題是由hadoop引起，修改如下：

解決辦法，調整xcievers參數

預設是4096，改為8192

vi /home/dwhftp/opt/hadoop/conf/hdfs-site.xml

<property>

<name>dfs.datanode.max.xcievers</name>

<value>8192</value>

</property>

dfs.datanode.max.xcievers 參數說明

一個 Hadoop HDFS Datanode 有一個同時處理檔案的上限. 這個參數叫 xcievers (Hadoop的作者把這個單詞拼錯了). 在你載入之前，先確認下你有沒有配置這個檔案conf/hdfs-site.xml裡面的xceivers參數，至少要有4096:

<property>

<name>dfs.datanode.max.xcievers</name>

<value>4096</value>

</property>

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