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  • ll wait until the actual Job struct is in place so that the API is agreed upon. <p><strong>NB</strong> Tests will follow after first review iteration. </p><p>该提问来源于开源项目:dcos/dcos-ui...
  • A Lock-Free Wait-Free Hash TableDr. Cliff Click Distinguished Engineer• Constant-Time Key-Value Mapping • Fast arbitrary function • Extendable, defined at runtime • Used for symbol tables, DB ...
  • <ol><li>create multiple indexes on AO table at the same time:</li></ol> <pre><code> # statement1 psql -d postgres -c "create index t1_xx21 ON t1(c2);" & # statement2 psql -d postgres -c &#...
  • 今天在查HBASE表时,一批次大概千万条数据, 表结构 rowkey是三个关键信息拼接的,A,B,C A 和 C 是多对多的关系, ...org.apache.hadoop.hbase.ipc.CallTimeoutException: Call id=6, waitTime=60030, rpcTimeout=

    今天在查HBASE表时,一批次大概千万条数据,
    表结构 rowkey是三个关键信息拼接的,A,B,C A 和 C 是多对多的关系,
    在只有第一信息的情况下使用HBASE的范围查询+模糊查询,setStartRow(A) ,setStopRow(A),RowFilter(RegexStringComparator©)

    查询时报错:
    org.apache.hadoop.hbase.ipc.CallTimeoutException: Call id=6, waitTime=60030, rpcTimeout=60000 rpcTimeout=60000
    row ‘12F3X’ on table ‘HBASETABLE’ at region=XXXX., hostname=XXX, seqNum=XX

    只看报错中 12F3X,不是HBASETABLE的完整Rowkey,而是设置的setStartRow(A),并且通过HBASE shell可以拿到12F3X对应的数据,那会是神马原因呢

    网上给出许多建议

    1.1 HBase有很多超时机制,本次报错应当是RPC超时引起的,可根据实际情况适当调整如下参数解决:
    Set mapreduce.task.timeout= 1200000
    set hbase.client.scanner.timeout.period=600000
    set hbase.rpc.timeout=600000
    其中, hbase.client.scanner.timeout.period和hbase.rpc.timeout最好配置一样大

    1.2 超时时长解决方法:
       (1)-增加超时时长;
       (2)-减少缓存条数;setCaching(100),但问题不再此处,因为取的每条数据很小,总的两千条也不会暂用很多的内存;
       (3)-过滤器原因:因为过滤查询和前缀查询的速度比较慢。所以在扫描的块中分布的合格的条数比例很小时,会很难再短时间内读取2000条数据 或者在当前的region中找不到数据时会与其他region做比对,确认数据是否真的不存在,解决方法,用范围查询代替前缀查询或模糊查询的动作。
       (4)-创建索引表: HBase 中的二级索引是通过建表的方式实现的,将能拿到A的表按照 C,A,B的格式作为rowkey新建一张索引表,拿到 A B C 后,再通过get的方式获取数据

    这样看来最可能是RowFIlter使用的原因了
    使用(4),最后问题解决!

    疑问:
    过滤器效率很慢,那其存在的意义???

    附上 过滤器 使用的example
    https://blog.csdn.net/zhangketuan/article/details/50528767

    展开全文
  • Replacing old systems table with new systems table and re-indexing - please wait" for the last 8 hours and it has made no progress and the entire program is locked down and not responding to any ...
  • t wait till the container signals its readiness with the <p><code>Database ready to use. Enjoy! ;)</code> -message <p>Instead it will wait till the <code>select 1 from dual</code> can be executed. ...
  • However, MIN_TIMER_WAIT field in the _by_event_name will stay at zero forever, while _by_instance table will reflect the actual minimum wait time. <p>This causes the perfschema.aggregate test to ...
  • <code>TCP: time wait bucket table overflow (CT0) Whereas with Apache, I had none of those ever, no matter how much traffic I thrown against it. Also, when checking the "Current connections on port...
  • entertainment entertainment
  • <p>All this works fine - I can receive notifications, load stuff and wait for next notification. But I dont think the keepalive is working - the connection eventually dies (DB is on Azure VM, this ...
  • <p>There are no docs yet since I thought I would wait for initial comments before going too far in that direction, so looking at the tests is a good idea to see what can be done now. The docstrings ...
  • Read/Write to table

    2020-12-01 17:37:46
    I am not sure what would happen if a function is writing data to the table and the settimeout function tries to read the data from the same table to sync at the same time. Would it throw an exception...
  • Table.exists hangs

    2020-12-09 02:19:52
    Lately it has started hanging on table.exists - the only thing that was updated recently was the emulator itself via apt. A thread dump reveals (client class names snipped at the bottom) <pre><code> ...
  • <div><p>The attached patch removes the geometry index creation from the create_table phase, and moves this to the optimization step. In theory, bulk loading of geometries should be faster if the index...
  • ALTER TABLE ..." 03:57:26,268 WARN Selector - Error in I/O with dbhost1/100.100.100.1 java.io.EOFException at org.apache.kafka.common.network.NetworkReceive.readFrom(NetworkReceive.java:62) ~...
  • table, we do not need it at all because we need to transfer all data in a replicated table. <p>No need to add cases because the reshuffle test cases are enough. <p>You can be familiar with the logic ...
  • table#search_table").initTable( { url: "@{search.KindergartenSearch.search()}", paramsCallback: searchKindergarten, rowCallback: searchTableRowCallback }); }); </script> ...
  • 资源忙碌 无法删除table SQL> drop table user.table; ...drop table SEMTOOLS.ST_BAIDU_REPORT ...ERROR at line 1: ...ORA-00054: resource busy and acquire with NOWAIT specified SQL> s

    资源忙碌

    无法删除table


    SQL> drop table user.table;
    drop table SEMTOOLS.ST_BAIDU_REPORT
                        *
    ERROR at line 1:
    ORA-00054: resource busy and acquire with NOWAIT specified


    SQL> select object_name as 对象名称,s.sid,s.serial#,p.spid as 系统进程号
    from v$locked_object l , dba_objects o , v$session s , v$process p
    where l.object_id=o.object_id and l.session_id=s.sid and s.paddr=p.addr;  2    3     #查的正在使用表的进程号

    对象名称
    --------------------------------------------------------------------------------
           SID    SERIAL# 系统进程号
    ---------- ---------- ------------------------------------
    ST_BAIDU_REPORT
           148      323 15456

    ST_BAIDU_REPORT
           148      323 15456

    SQL> alter system kill session '148,323';       #kill 之

    System altered.





    展开全文
  • <p>Measuring the cost of making 2M ustrings with a single thread is around 0.5s, while with all threads running at once (one will make progress while the others wait) it takes 4.0s (vs. 24.2s before ...
  • 3. Wait for hours and see. <p><strong>Expected behavior Task Executing error as shown in the following screenshot. <p><strong>Environment - PowerJob Version: [3.1.2] - Java Version: [java version &#...
  • <ul><li>[x] Wait for in-depth discussions from VO table stakeholders.</li><li>[x] Add change log.</li></ul> <p>Fixes #8716 <p>Supersedes #8745 </p><p>该提问来源于开源项目:astropy/astropy</p>...
  • cursor jump into end of row (if you will be wait a long time). I think the cursor moves on Pivot table but it doesn't show to user</p><p>该提问来源于开源项目:ONLYOFFICE/DocumentServer</p>...
  • at java.lang.Object.wait(Object.java:502) at java.util.TimerThread.mainLoop(Timer.java:526) - locked <0x00000000c1379e28> (a java.util.TaskQueue) at java.util.TimerThread.run(Timer.java:505)...
  • 开发说测试环境在删除表的时候,报了如下错误: SQL> drop table tke purge; drop table tke purge ...ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired   查看...

    开发说测试环境在删除表的时候,报了如下错误:

    SQL> drop table tke purge;
    drop table tke purge
               *
    ERROR at line 1:
    ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired
    

      

    查看一下锁住对象的会话id:

    SQL> select session_id from v$locked_object;
    
    SESSION_ID
    ----------
             6
    

     

    根据会话id继续查看:

    SQL> SELECT sid, serial# FROM v$session where sid = 6;
    
           SID    SERIAL# 
    ---------- ----------
             6         99 
    

      

    因为是测试环境,直接kill了会话:

    sql> alter system kill session '6,96';
    

      

    当然也可以在具体查看一下产生锁得会话信息等,比如:

    SQL> select object_name ,s.sid,s.serial#,p.spid 
      2  from v$locked_object l , dba_objects o , v$session s , v$process p
      3  where l.object_id=o.object_id and l.session_id=s.sid and s.paddr=p.addr;
    
    
    OBJECT_NAME                         SID    SERIAL# SPID
    ---------------------------- ---------- ---------- ---------
    TKE                                   6         96 30761
    

      

    转载于:https://www.cnblogs.com/abclife/p/7066855.html

    展开全文
  • SQL> truncate table alldm.DM_...truncate table alldm.DM_XQKD_YUJING_D*ERROR at line 1:ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired 2、 找到正在操作该表的session...

    SQL> truncate table alldm.DM_XQKD_YUJING_D;
    truncate table alldm.DM_XQKD_YUJING_D
    *
    ERROR at line 1:
    ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired

    2、 找到正在操作该表的session与sql
    SQL> set linesize 400
    SQL> set pagesize 400
    SQL> col object_name for a40
    SQL> select OWNER,OBJECT_NAME,OBJECT_ID from dba_objects where object_name='DM_XQKD_YUJING_D';

    OWNER OBJECT_NAME OBJECT_ID
    ------------------------------ ---------------------------------------- ----------
    ALLDM DM_XQKD_YUJING_D 7525915

    SQL> select SESSION_ID,OBJECT_ID from v$locked_object where OBJECT_ID = '7525915';

    SESSION_ID OBJECT_ID
    ---------- ----------
    2226 7525915

    SQL> set linesize 400
    SQL> set pagesize 400
    SQL> 
    select sql_text from v$session a,v$sqltext_with_newlines b 
    where DECODE(a.sql_hash_value, 0, prev_hash_value, sql_hash_value)=b.hash_value 
    and a.sid=&sid order by piece; 
    Enter value for sid: 2226
    old 3: and a.sid=&sid order by piece
    new 3: and a.sid=2226 order by piece

    SQL_TEXT
    ----------------------------------------------------------------
    INSERT /*+APPEND*/ INTO DM_XQKD_YUJING_D SELECT /*+ORDERED*/ :B2
    , A.AREA_NO, A.CITY_NO, A.XIAOQU_NO PLOT_ID, A.XIAOQU_NAME PLOT

    3、 找到该session的os进程
    select a.username,
    a.sid,
    a.serial#,
    b.spid "OS Process",
    to_char(a.logon_time,'DD/MM/YYYY hh24:mi:ss') "Logon time",
    a.osuser,
    a.program,
    a.status
    from v$session a, v$process b
    where a.sid = &sid
    and a.paddr = b.addr
    /

    USERNAME SID SERIAL# OS Process Logon time OSUSER PROGRAM STATUS
    ------------------------------ ---------- ---------- ------------------------ ------------------- ------------------------------ ------------------------------------------------ --------
    ALLDM 2226 28311 76949 13/01/2018 06:04:24 bca JDBC Thin Client ACTIVE

    4、 kill session
    SQL> alter system kill session '2226,28311';
    System altered.

    5、 在os层面核实进程是否被kill
    oracle@hbdw1:/oratmp$ps -ef | grep 76949
    oracle 11057 116412 0 16:21 pts/2 00:00:00 grep 76949

    6、 再次truncate成功
    SQL> truncate table alldm.DM_XQKD_YUJING_D;
    Table truncated.

    转载于:https://www.cnblogs.com/annannan/p/11299542.html

    展开全文
  • <div><p>For <code>performance_schema.events_statements_summary_by_digest, we limit the number of metrics we extract by using <code>ORDER BY SUM_TIMER_WAIT DESC LIMIT ?</code>. This can cause some ...
  • <p>Also found a way to avoid creating one table, while at it. <p>An instance of CI failure that this patch aims to fix: ...

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