2018-12-05 02:02:20,911 ERROR [phoenix-update-statistics-2] stats.StatisticsScanner: Failed to update statistics table!
org.apache.hadoop.hbase.DoNotRetryIOException: hconnection-0x6394a5f7 closed
        at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1174)
        at org.apache.hadoop.hbase.client.CoprocessorHConnection.locateRegion(CoprocessorHConnection.java:41)
        at org.apache.hadoop.hbase.client.RpcRetryingCallerWithReadReplicas.getRegionLocations(RpcRetryingCallerWithReadReplicas.java:305)
        at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:156)
        at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:60)
        at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:212)
        at org.apache.hadoop.hbase.client.ClientScanner.call(ClientScanner.java:314)
        at org.apache.hadoop.hbase.client.ClientScanner.nextScanner(ClientScanner.java:289)
        at org.apache.hadoop.hbase.client.ClientScanner.initializeScannerInConstruction(ClientScanner.java:164)
        at org.apache.hadoop.hbase.client.ClientScanner.<init>(ClientScanner.java:159)
        at org.apache.hadoop.hbase.client.HTable.getScanner(HTable.java:798)
        at org.apache.phoenix.schema.stats.StatisticsWriter.deleteStatsForRegion(StatisticsWriter.java:267)
        at org.apache.phoenix.schema.stats.StatisticsScanner$StatisticsScannerCallable.call(StatisticsScanner.java:156)
        at org.apache.phoenix.schema.stats.StatisticsScanner$StatisticsScannerCallable.call(StatisticsScanner.java:141)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
 

報錯可能原因：RPC超時。網路問題，對業務應該沒有影響，會自動重試。
新增如下兩個引數

<property>
<name>phoenix.coprocessor.maxServerCacheTimeToLiveMs</name>
<value>1800000</value>
</property>
<property>
<name>phoenix.coprocessor.maxMetaDataCacheTimeToLiveMs</name>
<value>1800000</value>
</property>