使用select count(*) 出现如下错误：
Error: Task org.apache.phoenix.job.JobManager$InstrumentedJobFutureTask@6e91893 rejected from org.apache.phoenix.job.JobManager$1@26ae880a[Running, pool size = 128, active threads = 128, queued tasks = 5000, completed tasks = 36647] (state=08000,code=101)
org.apache.phoenix.exception.PhoenixIOException: Task org.apache.phoenix.job.JobManager$InstrumentedJobFutureTask@6e91893 rejected from org.apache.phoenix.job.JobManager$1@26ae880a[Running, pool size = 128, active threads = 128, queued tasks = 5000, completed tasks = 36647]
at org.apache.phoenix.util.ServerUtil.parseServerException(ServerUtil.java:120)
at org.apache.phoenix.iterate.BaseResultIterators.getIterators(BaseResultIterators.java:1024)
at org.apache.phoenix.iterate.BaseResultIterators.getIterators(BaseResultIterators.java:916)
at org.apache.phoenix.iterate.ConcatResultIterator.getIterators(ConcatResultIterator.java:50)
at org.apache.phoenix.iterate.ConcatResultIterator.currentIterator(ConcatResultIterator.java:97)
at org.apache.phoenix.iterate.ConcatResultIterator.next(ConcatResultIterator.java:117)
at org.apache.phoenix.iterate.BaseGroupedAggregatingResultIterator.next(BaseGroupedAggregatingResultIterator.java:64)
at org.apache.phoenix.iterate.UngroupedAggregatingResultIterator.next(UngroupedAggregatingResultIterator.java:39)
at org.apache.phoenix.jdbc.PhoenixResultSet.next(PhoenixResultSet.java:779)
at sqlline.BufferedRows.<init>(BufferedRows.java:37)
at sqlline.SqlLine.print(SqlLine.java:1660)
at sqlline.Commands.execute(Commands.java:833)
at sqlline.Commands.sql(Commands.java:732)
at sqlline.SqlLine.dispatch(SqlLine.java:813)
at sqlline.SqlLine.begin(SqlLine.java:686)
at sqlline.SqlLine.start(SqlLine.java:398)
at sqlline.SqlLine.main(SqlLine.java:291)
解决办法：
修改hbase-site.xml
添加如下参数
phoenix.query.queueSize=10000 # 默认是5000
重启hbase
借鉴：
http://mail-archives.apache.org/mod_mbox/phoenix-user/201501.mbox/%3CCAAF1Jdg-E4=54e5dC3WazL=MVUe8C93E4zoHobiYWaOVs86TCA@mail.gmail.com%3E
https://blog.csdn.net/qq_36732988/article/details/87915449