[
https://issues.apache.org/jira/browse/HADOOP-2434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12552132
]
ps0ps edited comment on HADOOP-2434 at 12/15/07 12:10 PM:
--------------------------------------------------------------
Just more data points after tracing longer
{code}
20132
open("/disk3/nutch/data/filesystem/data/current/subdir3/blk_6879048861456107903.meta",
O_RDONLY) = 57
20132 fstat(57, {st_mode=S_IFREG|0664, st_size=437691, ...}) = 0
20132
stat("/disk3/nutch/data/filesystem/data/current/subdir3/blk_6879048861456107903.meta",
{st_mode=S_IFREG|0664, st_size=437691, ...}) = 0
20132 read(57, "\0", 1) = 1
20132 read(57, "\1", 1) = 1
20132 read(57, "\1", 1) = 1
20132 read(57, "\0", 1) = 1
20132 read(57, "\0", 1) = 1
20132 read(57, "\2", 1) = 1
20132 read(57, "\0", 1) = 1
20132 read(57, "\320", 1) = 1
20132 read(57, "\314", 1) = 1
20132 read(57, "\6", 1) = 1
20132 read(57, "\314", 1) = 1
20132 read(57, "Y", 1) = 1
20132 read(57, "\34", 1) = 1
20132 read(57, "\233", 1) = 1
20132 read(57, "z", 1) = 1
20132 read(57, "\210", 1) = 1
20132 read(57, "\221", 1) = 1
20132 read(57, "^", 1) = 1
20132 read(57, "k", 1) = 1
20132 read(57, "\255", 1) = 1
20132 read(57, "\257", 1) = 1
20132 read(57, "\314", 1) = 1
20132 read(57, "o", 1) = 1
....
20132 read(57, "\262", 1) = 1
20132
stat("/disk3/nutch/data/filesystem/data/current/subdir3/blk_6879048861456107903",
{st_mode=S_IFREG|0664, st_size=56023428, ...}) = 0
20132
open("/disk3/nutch/data/filesystem/data/current/subdir3/blk_6879048861456107903",
O_RDONLY) = 58
20132 fstat(58, {st_mode=S_IFREG|0664, st_size=56023428, ...}) = 0
20132 lseek(58, 30691328, SEEK_SET) = 30691328
20132 read(58, "\206&eu\30a\3454|[EMAIL PROTECTED]>1\3174\230\10\203"..., 4096)
= 4096
20132 read(57, "\22", 1) = 1
20132 read(57, "Q", 1) = 1
20132 read(57, "\26", 1) = 1
20132 read(57, "3", 1) = 1
20132 read(57, "\234", 1) = 1
20132 read(57, "m", 1) = 1
...
20132 read(57, "m", 1) = 1
20132 read(57, "\263", 1) = 1
20132 read(57, "\306", 1) = 1
20132 read(57, "C", 1) = 1
20132 read(57, "\332", 1) = 1
20132 read(57, "\223", 1) = 1
20132 read(57, "\353", 1) = 1
20132 read(57, "\314", 1) = 1
20132 read(57, "\242", 1) = 1
20132 sendto(44,
"\0\0\1\0\0\2\0\0\0\0\0\1\324P\0\0\0\2\0\206&eu\30a\3454|!J\333\351"..., 3659,
0, NULL, 0) = 3659
20132 read(58,
"P\244\266!\221\310}\213\250\"\274\230\264$O\245,\242\201\266\364\267\254\260\225\335x\276\325zq\276"...,
4096) = 4096
20132 sendto(44,
"\304yXh{z\23\254\r\331\vY\215\305\307\20\243\27\261*fB\10\33\217\377\356\350\5\327\330\271"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"rb\336\307\261\313\266L\212\215\276\364\373\357\347\273\324*\2745s%\325\366\247\255\333\345\272\334fL"...,
4096) = 4096
20132 sendto(44,
"\32\231\252\36\250\252\341\363\226\227\n\200o\322\303\274Lj]Z]U\236\217\224\216\366J\307\270M\225"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"eC\335\314\32\214\215tk\352\243wl\\\300n\34\233t\324s\200D\365\320\225.\253\6\16F\366"...,
4096) = 4096
20132 sendto(44,
"#=\263\243\np=\363\270E\300\3351\267\254\200\203\260O\336/\22c`\331\216\276\230L\207\260\343"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"\v\272\236\216\21^\16\224\223|\2051G#At\203.\7o\177D\307\357p\361\312\30\247\261l\25"...,
4096) = 4096
20132 sendto(44, "[EMAIL PROTECTED]/>\372+\3t\16\237\364\233]\255=,\4Mh"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"^\17\324I\377\377\377\377o\372\233(\346\36J\237\244\307\246v\312\325\rs\0\0\2\35\0\0\0\v"...,
4096) = 4096
20132 sendto(44,
"\242\252\230\20\302\202\353\227\3470C2\223\327d\322\275xS\273\327B\263\235lo\203\261\327Q\347\266"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"u1\334\32\355Y\26\37Zh\214\330hWms\317\337\230Z\225\213zj\32\356\25\252\271upm"...,
4096) = 4096
20132 sendto(44,
"\340a\205&i\323\320P\243\1\322P\340\266\4\332\354z\0;\244q\227\364\3523R\10\247\246\334\23"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"\260\306\210_`\30\3268i\332\\l\221\207\2115\360\366\216&\\\364\362!/\5\370\365\206\262\341\36"...,
4096) = 4096
20132 sendto(44,
"\315+)\344\305\26\333\243\351\353\n\317\32\355v\234\256\254\230\234_\367\264\313\337\n\324\217\345NV\214"...,
3640, 0, NULL, 0) = 3640
20132 sendto(44,
"\260\306\210_`\30\3268i\332\\l\221\207\2115\360\366\216&\\\364\362!/\5\370\365\206\262\341\36"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"\3\225zmU\210\361\321\231\16\271t\202\256\5\177\1\277\316+\323\330\0\0\2\37\0\0\0\v\n0"...,
4096) = 4096
20132 sendto(44, "\3030\20C\177\372\221\313\10\230}\271d\316\3347Ea
\206m\211\344\220T\276?\237\226U\253\310"..., 3640, 0, NULL, 0) = 3640
20132 read(58,
"\205]\376\313d\307\261\217\355\303!\347\30\246\343\201\234\251.^u\t\312\250\34\331VK\341\351X
"..., 4096) = 4096
20132 sendto(44,
"\240\333\376*75\353\201G\6\234\20X\32c\367F\204\343\217_~\360\365\275\214\20\24\35158\301"...,
3640, 0, NULL, 0) = 3640
20132 read(58, "\7\335,\224\346x\236\360\300
\35\334\330\252\222\302\340!\373\305\27-\16\21$a\251y\367\372\371\305"...,
4096) = 4096
20132 sendto(44,
"\3\346\35\301Xa\342\226\232\345\231\233N\\\224_\335\273a\264\274\0\5.\227\20\\\f\31\"\211\323"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"\200\260\315\16\265\r\363X<\227}\\)[\32%K\240\6\16\22\351\16!Q\222t\263\275\232S\270"...,
4096) = 4096
20132 sendto(44,
"iT\271\375\332J\315\355\253\330L\256t\275\265\261X\230\r|\235\303QQ\2623\233\357\260\0018\254"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"h\215\357\345\205_~3\333GaL\324\224\2566\362\200\310\264j\337\233\362\6\301\272\264\7\344c\262"...,
4096) = 4096
20132 sendto(44,
"\374lj4\346\33\264Q\32Ij\314\226\3\n;\334\r\\\16^2\'H\31636\372\365\346^\340"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"\221\210\201\214\2073\253D\301\252\17\206hoT\353&\377\f\376\232\2\334@
/\3\35&\26z\241"..., 4096) = 4096
20132 sendto(44,
"\335\177\2300\321\330\0\0\2#\0\0\0\v\n0000054873x\234%\223Yn\\"..., 3640, 0,
NULL, 0) = 3640
20132 read(58, "\243\264\0\203\206\330+h)[EMAIL PROTECTED]"..., 4096) = 4096
20132 sendto(44, "[EMAIL PROTECTED]@0MdXnE9"..., 3640, 0, NULL, 0 <unfinished
...>
20132 <... sendto resumed> ) = 3640
20132 sendto(44, "\243\264\0\203\206\330+h)[EMAIL PROTECTED]"..., 3640, 0,
NULL, 0) = 3640
20132 read(58,
"\236\r3\371\334\27\274VZ\362\353\t\17\253KW\256\233\355l\273\252\357(\213Sd\255I\323\252\233"...,
4096) = 4096
20132 sendto(44,
"\f\332l\300\373\225\231\267eX\246VOuw\224[N\310\364\2\224\335\351\17
\213\232\262a\352\254"..., 3640, 0, NULL, 0) = 3640
20132 read(58, "\32\3\243\272O\273z<[EMAIL PROTECTED];\34\34\203\'.x::"...,
4096) = 4096
20132 sendto(44,
"\204c`:BP\327d\341\360;\346\203\350^x#\214\260]\310}!#{\277#\373\253\234\312/"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"K\26\333\332+\363\215E_\330\325\213\242\0$.)\206\320\201:\246\362\4\330K\222\304=\325\10#"...,
4096) = 4096
20132 sendto(44, "\260 \201\23\234\333\5\330O\336\360\177\323\300\326\205\0\0\2
\0\0\0\v\n0000054"..., 3640, 0, NULL, 0) = 3640
20132 read(58,
"\37\344\277\323#\0\0\2%\0\0\0\v\n0000054915x\234%\223\331m#A"..., 4096) = 4096
20132 sendto(44,
"t\266\372\340\331\226\347\304d\217\321R\340B+n`X\223\325\371A\302\303\321iP\211,\253\375*"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"Z\353e\370\214d6\253\234\217*y\213\254PF\247\3454\227\20\16#\2535p]\20\277\361\20\216"...,
4096) = 4096
20132 sendto(44,
"\v\206\371pl\271O_E4=w\221\217\247\202\351c\3241\251\243\277\2357\323i<$\264[m"...,
3640, 0, NULL, 0 <unfinished ...>
20132 <... sendto resumed> ) = 3640
20132 read(58,
"\250\336t\225\1\222\31\232\342\337\236\222F\\\220Z\233|dK\267{\356\342EM\362^\354W\34\276"...,
4096) = 4096
20132 sendto(44,
"\2465\245w\370\333I\17\263u\227\245\253\313\347m\255+Yu\247\276\325Y=\311\272\256\322\353\316\302"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"Q\250\0060\326\16g\362\340\365\350\v\36\27)\222\327\344\2655\300\356l\213\222\200\2\225\16\221\247L"...,
4096) = 4096
{code}
was (Author: ps0ps):
Just more data points after tracing longer
{code}
20132
open("/disk3/nutch/data/filesystem/data/current/subdir3/blk_6879048861456107903.meta",
O_RDONLY) = 57
20132 fstat(57, {st_mode=S_IFREG|0664, st_size=437691, ...}) = 0
20132
stat("/disk3/nutch/data/filesystem/data/current/subdir3/blk_6879048861456107903.meta",
{st_mode=S_IFREG|0664, st_size=437691, ...}) = 0
20132 read(57, "\0", 1) = 1
20132 read(57, "\1", 1) = 1
20132 read(57, "\1", 1) = 1
20132 read(57, "\0", 1) = 1
20132 read(57, "\0", 1) = 1
20132 read(57, "\2", 1) = 1
20132 read(57, "\0", 1) = 1
20132 read(57, "\320", 1) = 1
20132 read(57, "\314", 1) = 1
20132 read(57, "\6", 1) = 1
20132 read(57, "\314", 1) = 1
20132 read(57, "Y", 1) = 1
20132 read(57, "\34", 1) = 1
20132 read(57, "\233", 1) = 1
20132 read(57, "z", 1) = 1
20132 read(57, "\210", 1) = 1
20132 read(57, "\221", 1) = 1
20132 read(57, "^", 1) = 1
20132 read(57, "k", 1) = 1
20132 read(57, "\255", 1) = 1
20132 read(57, "\257", 1) = 1
20132 read(57, "\314", 1) = 1
20132 read(57, "o", 1) = 1
....
20132 read(57, "\262", 1) = 1
20132
stat("/disk3/nutch/data/filesystem/data/current/subdir3/blk_6879048861456107903",
{st_mode=S_IFREG|0664, st_size=56023428, ...}) = 0
20132
open("/disk3/nutch/data/filesystem/data/current/subdir3/blk_6879048861456107903",
O_RDONLY) = 58
20132 fstat(58, {st_mode=S_IFREG|0664, st_size=56023428, ...}) = 0
20132 lseek(58, 30691328, SEEK_SET) = 30691328
20132 read(58, "\206&eu\30a\3454|[EMAIL PROTECTED]>1\3174\230\10\203"..., 4096)
= 4096
20132 read(57, "\22", 1) = 1
20132 read(57, "Q", 1) = 1
20132 read(57, "\26", 1) = 1
20132 read(57, "3", 1) = 1
20132 read(57, "\234", 1) = 1
20132 read(57, "m", 1) = 1
...
20132 read(57, "m", 1) = 1
20132 read(57, "\263", 1) = 1
20132 read(57, "\306", 1) = 1
20132 read(57, "C", 1) = 1
20132 read(57, "\332", 1) = 1
20132 read(57, "\223", 1) = 1
20132 read(57, "\353", 1) = 1
20132 read(57, "\314", 1) = 1
20132 read(57, "\242", 1) = 1
20132 sendto(44,
"\0\0\1\0\0\2\0\0\0\0\0\1\324P\0\0\0\2\0\206&eu\30a\3454|!J\333\351"..., 3659,
0, NULL, 0) = 3659
20132 read(58,
"P\244\266!\221\310}\213\250\"\274\230\264$O\245,\242\201\266\364\267\254\260\225\335x\276\325zq\276"...,
4096) = 4096
20132 sendto(44,
"\304yXh{z\23\254\r\331\vY\215\305\307\20\243\27\261*fB\10\33\217\377\356\350\5\327\330\271"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"rb\336\307\261\313\266L\212\215\276\364\373\357\347\273\324*\2745s%\325\366\247\255\333\345\272\334fL"...,
4096) = 4096
20132 sendto(44,
"\32\231\252\36\250\252\341\363\226\227\n\200o\322\303\274Lj]Z]U\236\217\224\216\366J\307\270M\225"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"eC\335\314\32\214\215tk\352\243wl\\\300n\34\233t\324s\200D\365\320\225.\253\6\16F\366"...,
4096) = 4096
20132 sendto(44,
"#=\263\243\np=\363\270E\300\3351\267\254\200\203\260O\336/\22c`\331\216\276\230L\207\260\343"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"\v\272\236\216\21^\16\224\223|\2051G#At\203.\7o\177D\307\357p\361\312\30\247\261l\25"...,
4096) = 4096
20132 sendto(44, "[EMAIL PROTECTED]/>\372+\3t\16\237\364\233]\255=,\4Mh"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"^\17\324I\377\377\377\377o\372\233(\346\36J\237\244\307\246v\312\325\rs\0\0\2\35\0\0\0\v"...,
4096) = 4096
20132 sendto(44,
"\242\252\230\20\302\202\353\227\3470C2\223\327d\322\275xS\273\327B\263\235lo\203\261\327Q\347\266"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"u1\334\32\355Y\26\37Zh\214\330hWms\317\337\230Z\225\213zj\32\356\25\252\271upm"...,
4096) = 4096
20132 sendto(44,
"\340a\205&i\323\320P\243\1\322P\340\266\4\332\354z\0;\244q\227\364\3523R\10\247\246\334\23"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"\260\306\210_`\30\3268i\332\\l\221\207\2115\360\366\216&\\\364\362!/\5\370\365\206\262\341\36"...,
4096) = 4096
20132 sendto(44,
"\315+)\344\305\26\333\243\351\353\n\317\32\355v\234\256\254\230\234_\367\264\313\337\n\324\217\345NV\214"...,
3640, 0, NULL, 0) = 3640
20132 sendto(44,
"\260\306\210_`\30\3268i\332\\l\221\207\2115\360\366\216&\\\364\362!/\5\370\365\206\262\341\36"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"\3\225zmU\210\361\321\231\16\271t\202\256\5\177\1\277\316+\323\330\0\0\2\37\0\0\0\v\n0"...,
4096) = 4096
20132 sendto(44, "\3030\20C\177\372\221\313\10\230}\271d\316\3347Ea
\206m\211\344\220T\276?\237\226U\253\310"..., 3640, 0, NULL, 0) = 3640
20132 read(58,
"\205]\376\313d\307\261\217\355\303!\347\30\246\343\201\234\251.^u\t\312\250\34\331VK\341\351X
"..., 4096) = 4096
20132 sendto(44,
"\240\333\376*75\353\201G\6\234\20X\32c\367F\204\343\217_~\360\365\275\214\20\24\35158\301"...,
3640, 0, NULL, 0) = 3640
20132 read(58, "\7\335,\224\346x\236\360\300
\35\334\330\252\222\302\340!\373\305\27-\16\21$a\251y\367\372\371\305"...,
4096) = 4096
20132 sendto(44,
"\3\346\35\301Xa\342\226\232\345\231\233N\\\224_\335\273a\264\274\0\5.\227\20\\\f\31\"\211\323"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"\200\260\315\16\265\r\363X<\227}\\)[\32%K\240\6\16\22\351\16!Q\222t\263\275\232S\270"...,
4096) = 4096
20132 sendto(44,
"iT\271\375\332J\315\355\253\330L\256t\275\265\261X\230\r|\235\303QQ\2623\233\357\260\0018\254"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"h\215\357\345\205_~3\333GaL\324\224\2566\362\200\310\264j\337\233\362\6\301\272\264\7\344c\262"...,
4096) = 4096
20132 sendto(44,
"\374lj4\346\33\264Q\32Ij\314\226\3\n;\334\r\\\16^2\'H\31636\372\365\346^\340"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"\221\210\201\214\2073\253D\301\252\17\206hoT\353&\377\f\376\232\2\334@
/\3\35&\26z\241"..., 4096) = 4096
20132 sendto(44,
"\335\177\2300\321\330\0\0\2#\0\0\0\v\n0000054873x\234%\223Yn\\"..., 3640, 0,
NULL, 0) = 3640
20132 read(58, "\243\264\0\203\206\330+h)[EMAIL PROTECTED]"..., 4096) = 4096
20132 sendto(44, "[EMAIL PROTECTED]@0MdXnE9"..., 3640, 0, NULL, 0 <unfinished
...>
20132 <... sendto resumed> ) = 3640
20132 sendto(44, "\243\264\0\203\206\330+h)[EMAIL PROTECTED]"..., 3640, 0,
NULL, 0) = 3640
20132 read(58,
"\236\r3\371\334\27\274VZ\362\353\t\17\253KW\256\233\355l\273\252\357(\213Sd\255I\323\252\233"...,
4096) = 4096
20132 sendto(44,
"\f\332l\300\373\225\231\267eX\246VOuw\224[N\310\364\2\224\335\351\17
\213\232\262a\352\254"..., 3640, 0, NULL, 0) = 3640
20132 read(58, "\32\3\243\272O\273z<[EMAIL PROTECTED];\34\34\203\'.x::"...,
4096) = 4096
20132 sendto(44,
"\204c`:BP\327d\341\360;\346\203\350^x#\214\260]\310}!#{\277#\373\253\234\312/"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"K\26\333\332+\363\215E_\330\325\213\242\0$.)\206\320\201:\246\362\4\330K\222\304=\325\10#"...,
4096) = 4096
20132 sendto(44, "\260 \201\23\234\333\5\330O\336\360\177\323\300\326\205\0\0\2
\0\0\0\v\n0000054"..., 3640, 0, NULL, 0) = 3640
20132 read(58,
"\37\344\277\323#\0\0\2%\0\0\0\v\n0000054915x\234%\223\331m#A"..., 4096) = 4096
20132 sendto(44,
"t\266\372\340\331\226\347\304d\217\321R\340B+n`X\223\325\371A\302\303\321iP\211,\253\375*"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"Z\353e\370\214d6\253\234\217*y\213\254PF\247\3454\227\20\16#\2535p]\20\277\361\20\216"...,
4096) = 4096
20132 sendto(44,
"\v\206\371pl\271O_E4=w\221\217\247\202\351c\3241\251\243\277\2357\323i<$\264[m"...,
3640, 0, NULL, 0 <unfinished ...>
20132 <... sendto resumed> ) = 3640
20132 read(58,
"\250\336t\225\1\222\31\232\342\337\236\222F\\\220Z\233|dK\267{\356\342EM\362^\354W\34\276"...,
4096) = 4096
20132 sendto(44,
"\2465\245w\370\333I\17\263u\227\245\253\313\347m\255+Yu\247\276\325Y=\311\272\256\322\353\316\302"...,
3640, 0, NULL, 0) = 3640
20132 read(58,
"Q\250\0060\326\16g\362\340\365\350\v\36\27)\222\327\344\2655\300\356l\213\222\200\2\225\16\221\247L"...,
4096) = 4096
> MapFile.get on HDFS in TRUNK is WAY!!! slower than 0.15.x
> ---------------------------------------------------------
>
> Key: HADOOP-2434
> URL: https://issues.apache.org/jira/browse/HADOOP-2434
> Project: Hadoop
> Issue Type: Bug
> Components: io
> Reporter: stack
> Attachments: TestMapFile.java
>
>
> Stall happens down in SequenceFile in the first call to getPos inside
> readRecordLength. I tried the johano patch from HADOOP-2172 that restores
> the positional cache but that didn't seem to be the issue here.
> Here is data to support my assertion.
> I wrote a little program to make a MapFile of 1M records. I then did 1M
> random reads from same file. Below are timings from a 0.15.0 and TRUNK as of
> this afternoon run.
> 0.15.x branch:
> {code}
> [EMAIL PROTECTED] branch-0.15]$ ./bin/hadoop org.apache.hadoop.io.TestMapFile
> .07/12/15 01:29:02 WARN util.NativeCodeLoader: Unable to load native-hadoop
> library for your platform... using builtin-java classes where applicable
> 07/12/15 01:29:02 INFO io.TestMapFile: Writing 1000000 rows to
> testMapFileRandomAccess
> 07/12/15 01:32:04 INFO io.TestMapFile: Writing 1000000 records took 182009ms
> 07/12/15 01:32:04 INFO io.TestMapFile: Reading 1000000 random rows
> 07/12/15 01:48:02 INFO io.TestMapFile: Reading 1000000 random records took
> 958243ms
> Time: 1,140.652
> OK (1 test)
> {code}
> For the below test using TRUNK r604352, I amended the test so it output a log
> message every 100k reads:
> {code}
> [EMAIL PROTECTED] hadoop-trunk]$ ./bin/hadoop org.apache.hadoop.io.TestMapFile
> .07/12/15 01:56:34 WARN util.NativeCodeLoader: Unable to load native-hadoop
> library for your platform... using builtin-java classes where applicable
> 07/12/15 01:56:34 INFO io.TestMapFile: Writing 1000000 rows to
> testMapFileRandomAccess
> 07/12/15 01:59:38 INFO io.TestMapFile: Writing 1000000 records took 183986ms
> 07/12/15 01:59:38 INFO io.TestMapFile: Reading 1000000 random rows
> .........
> {code}
> After 20 minutes it still hadn't printed out the 'read 100k messages' (I had
> to leave -- will fill in final figures later)
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