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[test:21000] default> select * from tt_user where key like '1%' limit 1;
Query: select * from tt_user where key like '1%' limit 1
Query submitted at: 2018-09-25 10:47:53 (Coordinator: http://test:25000)
ERROR: AnalysisException: Failed to evaluate expr: 1
CAUSED BY: InternalException: Memory limit exceeded: Error occurred on backend fwqzx002.zh:22000 by fragment 0:0
Memory left in process limit: -3.52 MB
Query(a74236e3a91ac5c5:999aaa4100000000): Total=0 Peak=0
<unnamed>: Total=0 Peak=0Process: memory limit exceeded. Limit=256.00 MB Total=259.52 MB Peak=299.01 MB
Buffer Pool: Free Buffers: Total=0
Buffer Pool: Clean Pages: Total=0
Buffer Pool: Unused Reservation: Total=0
TCMalloc Overhead: Total=21.67 MB
RequestPool=fe-eval-exprs: Total=0 Peak=0
Query(a74236e3a91ac5c5:999aaa4100000000): Total=0 Peak=0
RequestPool=root.zhonghong: Total=0 Peak=111.00 KB
Untracked Memory: Total=237.85 MB原因：内存限制，导致异常
修改内存限制为-1（生产环境不可设置为-1，根据业务实际情况进行调整）
随后启动impala，发现启动impala-daemon又报错，查看该文件
Redirecting stderr to /var/log/impalad/impalad.ERROR内容为
[root@test~]# cat /var/log/impalad/impalad.ERROR
Log file created at: 2018/09/25 10:56:58
Running on machine: test
Log line format: [IWEF]mmdd hh:mm:ss.uuuuuu threadid file:line] msg
E0925 10:56:58.523322 8942 logging.cc:121] stderr will be logged to this file.
F0925 10:57:00.543490 8942 impalad-main.cc:73] The process memory limit (--mem_limit) must be a positive bytes value or percentage: -1
. Impalad exiting.
*** Check failure stack trace: ***
@ 0x22be89d google::LogMessage::Fail()
@ 0x22c0142 google::LogMessage::SendToLog()
@ 0x22be277 google::LogMessage::Flush()
@ 0x22c183e google::LogMessageFatal::~LogMessageFatal()
@ 0xda7b7c ImpaladMain()
@ 0x969714 main
@ 0x7f04d2094445 __libc_start_main
@ 0x9b20d1 (unknown)
Picked up JAVA_TOOL_OPTIONS:
Wrote minidump to /var/log/impala-minidumps/impalad/4aaa68db-7340-45f3-e57aeb98-428c1f14.dmp提示不能设置为-1，什么鬼。
设置为零吧（为空），让Impala自行选择吧。启动服务成功。