Very simple log files purger added.

File number types fixed.


storage/maria/unittest/Makefile.am:
  Test of purger added.
storage/maria/unittest/ma_test_loghandler_purge-t.c:
  New BitKeeper file ``storage/maria/unittest/ma_test_loghandler_purge-t.c''

storage/maria/ma_loghandler.c

@@ -172,6 +172,13 @@ struct st_translog_descriptor
   */
   pthread_mutex_t unfinished_files_lock;
   DYNAMIC_ARRAY unfinished_files;
+
+  /* Purger data: minimum file in the log (or 0 if unknown) */
+  uint32 min_file_number;
+  /* Protect purger from many calls and it's data */
+  pthread_mutex_t purger_lock;
+  /* last low water mark checked */
+  LSN last_lsn_checked;
 };
 
 static struct st_translog_descriptor log_descriptor;
@@ -743,13 +750,13 @@ my_bool translog_read_file_header(LOGHANDLER_FILE_INFO *desc, File file)
   @retval 1 Error
 */
 
-static my_bool translog_set_lsn_for_files(ulong from_file, ulong to_file,
+static my_bool translog_set_lsn_for_files(uint32 from_file, uint32 to_file,
                                           LSN lsn, my_bool is_locked)
 {
-  ulong file;
+  uint32 file;
   DBUG_ENTER("translog_set_lsn_for_files");
   DBUG_PRINT("enter", ("From: %lu  to: %lu  lsn: (%lu,0x%lx)  locked: %d",
-                       from_file, to_file,
+                       (ulong) from_file, (ulong) to_file,
                        (ulong) LSN_FILE_NO(lsn), (ulong) LSN_OFFSET(lsn),
                        is_locked));
   DBUG_ASSERT(from_file <= to_file);
@@ -758,7 +765,7 @@ static my_bool translog_set_lsn_for_files(ulong from_file, ulong to_file,
   /* Checks the current file (not finished yet file) */
   if (!is_locked)
     translog_lock();
-  if (to_file == (ulong) LSN_FILE_NO(log_descriptor.horizon))
+  if (to_file == (uint32) LSN_FILE_NO(log_descriptor.horizon))
   {
     if (likely(cmp_translog_addr(lsn, log_descriptor.max_lsn) > 0))
       log_descriptor.max_lsn= lsn;
@@ -788,8 +795,8 @@ static my_bool translog_set_lsn_for_files(ulong from_file, ulong to_file,
 /* descriptor of file in unfinished_files */
 struct st_file_counter
 {
-  ulong file;            /* file number */
-  ulong counter;         /* counter for started writes */
+  uint32 file;            /* file number */
+  uint32 counter;         /* counter for started writes */
 };
 
 
@@ -799,14 +806,14 @@ struct st_file_counter
   @param file            log file number
 */
 
-static void translog_mark_file_unfinished(ulong file)
+static void translog_mark_file_unfinished(uint32 file)
 {
   int place, i;
   struct st_file_counter fc, *fc_ptr;
   fc.file= file; fc.counter= 1;
 
   DBUG_ENTER("translog_mark_file_unfinished");
-  DBUG_PRINT("enter", ("file: %lu", file));
+  DBUG_PRINT("enter", ("file: %lu", (ulong) file));
 
   pthread_mutex_lock(&log_descriptor.unfinished_files_lock);
 
@@ -871,13 +878,13 @@ static void translog_mark_file_unfinished(ulong file)
   @param file            log file number
 */
 
-static void translog_mark_file_finished(ulong file)
+static void translog_mark_file_finished(uint32 file)
 {
   int i;
   struct st_file_counter *fc_ptr;
 
   DBUG_ENTER("translog_mark_file_finished");
-  DBUG_PRINT("enter", ("file: %lu", file));
+  DBUG_PRINT("enter", ("file: %lu", (ulong) file));
 
   pthread_mutex_lock(&log_descriptor.unfinished_files_lock);
 
@@ -913,11 +920,11 @@ static void translog_mark_file_finished(ulong file)
     @retval # LSN of the record which parts stored in this file
 */
 
-LSN translog_get_file_max_lsn_stored(ulong file)
+LSN translog_get_file_max_lsn_stored(uint32 file)
 {
-  ulong limit= FILENO_IMPOSSIBLE;
+  uint32 limit= FILENO_IMPOSSIBLE;
   DBUG_ENTER("translog_get_file_max_lsn_stored");
-  DBUG_PRINT("enter", ("file: %lu", file));
+  DBUG_PRINT("enter", ("file: %lu", (ulong)file));
 
   pthread_mutex_lock(&log_descriptor.unfinished_files_lock);
 
@@ -2540,10 +2547,14 @@ my_bool translog_init(const char *directory,
                          MY_MUTEX_INIT_FAST) ||
       pthread_mutex_init(&log_descriptor.unfinished_files_lock,
                          MY_MUTEX_INIT_FAST) ||
+      pthread_mutex_init(&log_descriptor.purger_lock,
+                         MY_MUTEX_INIT_FAST) ||
       init_dynamic_array(&log_descriptor.unfinished_files,
                          sizeof(struct st_file_counter),
                          10, 10 CALLER_INFO))
     DBUG_RETURN(1);
+  log_descriptor.min_file_number= 0;
+  log_descriptor.last_lsn_checked= LSN_IMPOSSIBLE;
 
   /* Directory to store files */
   unpack_dirname(log_descriptor.directory, directory);
@@ -2919,6 +2930,7 @@ void translog_destroy()
     pthread_mutex_destroy(&log_descriptor.sent_to_file_lock);
     pthread_mutex_destroy(&log_descriptor.file_header_lock);
     pthread_mutex_destroy(&log_descriptor.unfinished_files_lock);
+    pthread_mutex_destroy(&log_descriptor.purger_lock);
     delete_dynamic(&log_descriptor.unfinished_files);
 
     my_close(log_descriptor.directory_fd, MYF(MY_WME));
@@ -6318,39 +6330,45 @@ my_bool translog_is_file(uint file_no)
   MY_STAT stat_buff;
   char path[FN_REFLEN];
   return (test(my_stat(translog_filename_by_fileno(file_no, path),
-                       &stat_buff, MYF(MY_WME))));
+                       &stat_buff, MYF(0))));
 }
 
 
 /**
-   @brief returns the LSN of the first record starting in this log
+  @brief returns minimum log file number
 
-   @retval LSN_ERROR Error
-   @retval LSN_IMPOSSIBLE no log
-   @retval # LSN of the first record
+  @param horizon         the end of the log
+  @param is_protected    true if it is under purge_log protection
+
+  @retval minimum file number
+  @retval 0 no files found
 */
 
-LSN translog_first_lsn_in_log()
+static uint32 translog_first_file(TRANSLOG_ADDRESS horizon, int is_protected)
 {
-  TRANSLOG_ADDRESS addr, horizon= translog_get_horizon();
-  TRANSLOG_VALIDATOR_DATA data;
-  uint min_file= 1, max_file= LSN_FILE_NO(horizon);
-  uint chunk_type;
-  uint16 chunk_offset;
-  uchar *page;
-  TRANSLOG_SCANNER_DATA scanner;
-  DBUG_ENTER("translog_first_lsn_in_log");
-  DBUG_PRINT("info", ("Horizon: (%lu,0x%lx)",
-                      (ulong) LSN_FILE_NO(addr), (ulong) LSN_OFFSET(addr)));
+  TRANSLOG_ADDRESS addr;
+  uint min_file= 1, max_file;
+  DBUG_ENTER("translog_first_file");
+  if (!is_protected)
+    pthread_mutex_lock(&log_descriptor.purger_lock);
+  if (log_descriptor.min_file_number &&
+      translog_is_file(log_descriptor.min_file_number))
+  {
+    DBUG_PRINT("info", ("cached %lu",
+                        (ulong) log_descriptor.min_file_number));
+    if (!is_protected)
+      pthread_mutex_unlock(&log_descriptor.purger_lock);
+    DBUG_RETURN(log_descriptor.min_file_number);
+  }
 
-  if (addr == MAKE_LSN(1, TRANSLOG_PAGE_SIZE))
+  max_file= LSN_FILE_NO(horizon);
+
+  if (MAKE_LSN(1, TRANSLOG_PAGE_SIZE) >= horizon)
   {
     /* there is no first page yet */
-    DBUG_RETURN(LSN_IMPOSSIBLE);
+    DBUG_RETURN(0);
   }
 
-
-  /*TODO: lock loghandler purger when it will be created */
   /* binary search for last file */
   while (min_file != max_file && min_file != (max_file - 1))
   {
@@ -6364,8 +6382,41 @@ LSN translog_first_lsn_in_log()
     else
       min_file= test;
   }
+  log_descriptor.min_file_number= max_file;
+  if (!is_protected)
+    pthread_mutex_unlock(&log_descriptor.purger_lock);
+  DBUG_RETURN(max_file);
+}
+
+
+/**
+   @brief returns the LSN of the first record starting in this log
+
+   @retval LSN_ERROR Error
+   @retval LSN_IMPOSSIBLE no log
+   @retval # LSN of the first record
+*/
+
+LSN translog_first_lsn_in_log()
+{
+  TRANSLOG_ADDRESS addr, horizon= translog_get_horizon();
+  TRANSLOG_VALIDATOR_DATA data;
+  uint file;
+  uint chunk_type;
+  uint16 chunk_offset;
+  uchar *page;
+  TRANSLOG_SCANNER_DATA scanner;
+  DBUG_ENTER("translog_first_lsn_in_log");
+  DBUG_PRINT("info", ("Horizon: (%lu,0x%lx)",
+                      (ulong) LSN_FILE_NO(addr), (ulong) LSN_OFFSET(addr)));
+
+  if (!(file= translog_first_file(horizon, 0)))
+  {
+    /* log has no records yet */
+    DBUG_RETURN(LSN_IMPOSSIBLE);
+  }
 
-  addr= MAKE_LSN(max_file, TRANSLOG_PAGE_SIZE); /* the first page of the file */
+  addr= MAKE_LSN(file, TRANSLOG_PAGE_SIZE); /* the first page of the file */
   data.addr= &addr;
   if ((page= translog_get_page(&data, scanner.buffer)) == NULL ||
       (chunk_offset= translog_get_first_chunk_offset(page)) == 0)
@@ -6415,7 +6466,7 @@ LSN translog_first_theoretical_lsn()
     DBUG_RETURN(LSN_IMPOSSIBLE);
   if (addr == MAKE_LSN(1, TRANSLOG_PAGE_SIZE))
   {
-    /* there is no first page yet */
+    /* log has no records yet */
     DBUG_RETURN(MAKE_LSN(1, TRANSLOG_PAGE_SIZE +
                          log_descriptor.page_overhead));
   }
@@ -6428,3 +6479,55 @@ LSN translog_first_theoretical_lsn()
   DBUG_RETURN(MAKE_LSN(1, TRANSLOG_PAGE_SIZE +
                        page_overhead[page[TRANSLOG_PAGE_FLAGS]]));
 }
+
+
+/**
+  @brief Check given low water mark and purge files if it is need
+
+  @param low the last (minimum) LSN which is need
+
+  @retval 0 OK
+  @retval 1 Error
+*/
+
+my_bool translog_purge(LSN low)
+{
+  uint32 last_need_file= LSN_FILE_NO(low);
+  TRANSLOG_ADDRESS horizon= translog_get_horizon();
+  int rc= 0;
+  DBUG_ENTER("translog_purge");
+  DBUG_PRINT("enter", ("low: (%lu,0x%lx)",
+                       (ulong)LSN_FILE_NO(low),
+                       (ulong)LSN_OFFSET(low)));
+
+  pthread_mutex_lock(&log_descriptor.purger_lock);
+  if (LSN_FILE_NO(log_descriptor.last_lsn_checked) < last_need_file)
+  {
+    uint32 i;
+    uint32 min_file= translog_first_file(horizon, 1);
+    DBUG_ASSERT(min_file != 0); /* log is already started */
+
+    for(i= min_file; i < last_need_file && rc == 0; i++)
+    {
+      LSN lsn= translog_get_file_max_lsn_stored(i);
+      if (lsn == LSN_IMPOSSIBLE)
+        break;   /* files are still in writing */
+      if (lsn == LSN_ERROR)
+      {
+        rc= 1;
+        break;
+      }
+      if (cmp_translog_addr(lsn, low) >= 0)
+        break;
+      DBUG_PRINT("info", ("purge file %lu", (ulong) i));
+      {
+        char path[FN_REFLEN], *file_name;
+        file_name= translog_filename_by_fileno(i, path);
+        rc= test(my_delete(file_name, MYF(MY_WME)));
+      }
+    }
+  }
+
+  pthread_mutex_unlock(&log_descriptor.purger_lock);
+  DBUG_RETURN(rc);
+}

storage/maria/ma_loghandler.h

@@ -250,7 +250,9 @@ extern my_bool translog_init_scanner(LSN lsn,
 
 extern int translog_read_next_record_header(TRANSLOG_SCANNER_DATA *scanner,
                                             TRANSLOG_HEADER_BUFFER *buff);
-extern LSN translog_get_file_max_lsn_stored(ulong file);
+extern LSN translog_get_file_max_lsn_stored(uint32 file);
+extern my_bool translog_purge(LSN low);
+extern my_bool translog_is_file(uint file_no);
 extern my_bool translog_lock();
 extern my_bool translog_unlock();
 extern void translog_lock_assert_owner();

storage/maria/unittest/Makefile.am

@@ -45,7 +45,8 @@ noinst_PROGRAMS =	ma_control_file-t trnman-t lockman2-t \
 			ma_test_loghandler_long-t-big \
 			ma_test_loghandler_noflush-t \
 			ma_test_loghandler_first_lsn-t \
-                        ma_test_loghandler_max_lsn-t
+                        ma_test_loghandler_max_lsn-t \
+                        ma_test_loghandler_purge-t
 
 ma_test_loghandler_t_SOURCES = ma_test_loghandler-t.c ma_maria_log_cleanup.c
 ma_test_loghandler_multigroup_t_SOURCES = ma_test_loghandler_multigroup-t.c ma_maria_log_cleanup.c
@@ -56,6 +57,7 @@ ma_test_loghandler_long_t_big_CPPFLAGS = -DLONG_LOG_TEST
 ma_test_loghandler_noflush_t_SOURCES = ma_test_loghandler_noflush-t.c ma_maria_log_cleanup.c
 ma_test_loghandler_first_lsn_t_SOURCES = ma_test_loghandler_first_lsn-t.c ma_maria_log_cleanup.c
 ma_test_loghandler_max_lsn_t_SOURCES = ma_test_loghandler_max_lsn-t.c ma_maria_log_cleanup.c
+ma_test_loghandler_purge_t_SOURCES = ma_test_loghandler_purge-t.c ma_maria_log_cleanup.c
 
 ma_pagecache_single_src =	ma_pagecache_single.c test_file.c
 ma_pagecache_consist_src =	ma_pagecache_consist.c test_file.c

storage/maria/unittest/ma_test_loghandler_purge-t.c

+#include "../maria_def.h"
+#include <stdio.h>
+#include <errno.h>
+#include <tap.h>
+#include "../trnman.h"
+
+extern my_bool maria_log_remove();
+
+#ifndef DBUG_OFF
+static const char *default_dbug_option;
+#endif
+
+#define PCACHE_SIZE (1024*1024*10)
+#define PCACHE_PAGE TRANSLOG_PAGE_SIZE
+#define LOG_FILE_SIZE (4*1024L*1024L)
+#define LOG_FLAGS 0
+#define LONG_BUFFER_SIZE (LOG_FILE_SIZE + LOG_FILE_SIZE / 2)
+
+
+int main(int argc __attribute__((unused)), char *argv[])
+{
+  ulong i;
+  uint pagen;
+  uchar long_tr_id[6];
+  PAGECACHE pagecache;
+  LSN lsn;
+  LEX_STRING parts[TRANSLOG_INTERNAL_PARTS + 1];
+  uchar *long_buffer= malloc(LONG_BUFFER_SIZE);
+
+  MY_INIT(argv[0]);
+
+  plan(4);
+
+  bzero(&pagecache, sizeof(pagecache));
+  bzero(long_buffer, LONG_BUFFER_SIZE);
+  maria_data_root= ".";
+  if (maria_log_remove())
+    exit(1);
+
+  bzero(long_tr_id, 6);
+#ifndef DBUG_OFF
+#if defined(__WIN__)
+  default_dbug_option= "d:t:i:O,\\ma_test_loghandler.trace";
+#else
+  default_dbug_option= "d:t:i:o,/tmp/ma_test_loghandler.trace";
+#endif
+  if (argc > 1)
+  {
+    DBUG_SET(default_dbug_option);
+    DBUG_SET_INITIAL(default_dbug_option);
+  }
+#endif
+
+  if (ma_control_file_create_or_open(TRUE))
+  {
+    fprintf(stderr, "Can't init control file (%d)\n", errno);
+    exit(1);
+  }
+  if ((pagen= init_pagecache(&pagecache, PCACHE_SIZE, 0, 0,
+                             PCACHE_PAGE)) == 0)
+  {
+    fprintf(stderr, "Got error: init_pagecache() (errno: %d)\n", errno);
+    exit(1);
+  }
+  if (translog_init(".", LOG_FILE_SIZE, 50112, 0, &pagecache, LOG_FLAGS))
+  {
+    fprintf(stderr, "Can't init loghandler (%d)\n", errno);
+    translog_destroy();
+    exit(1);
+  }
+  example_loghandler_init();
+
+  /* write more then 1 file */
+  int4store(long_tr_id, 0);
+  parts[TRANSLOG_INTERNAL_PARTS + 0].str= (char*)long_tr_id;
+  parts[TRANSLOG_INTERNAL_PARTS + 0].length= 6;
+  if (translog_write_record(&lsn,
+                            LOGREC_FIXED_RECORD_0LSN_EXAMPLE,
+                            &dummy_transaction_object, NULL, 6,
+                            TRANSLOG_INTERNAL_PARTS + 1,
+                            parts, NULL))
+  {
+    fprintf(stderr, "Can't write record #%lu\n", (ulong) 0);
+    translog_destroy();
+    exit(1);
+  }
+
+  translog_purge(lsn);
+  if (!translog_is_file(1))
+  {
+    fprintf(stderr, "First file was removed after first record\n");
+    translog_destroy();
+    exit(1);
+  }
+  ok(1, "First is not removed");
+
+  for(i= 0; i < LOG_FILE_SIZE/6 && LSN_FILE_NO(lsn) == 1; i++)
+  {
+    if (translog_write_record(&lsn,
+                              LOGREC_FIXED_RECORD_0LSN_EXAMPLE,
+                              &dummy_transaction_object, NULL, 6,
+                              TRANSLOG_INTERNAL_PARTS + 1,
+                              parts, NULL))
+    {
+      fprintf(stderr, "Can't write record #%lu\n", (ulong) 0);
+      translog_destroy();
+      exit(1);
+    }
+  }
+
+  translog_purge(lsn);
+  if (translog_is_file(1))
+  {
+    fprintf(stderr, "First file was not removed.\n");
+    translog_destroy();
+    exit(1);
+  }
+
+  ok(1, "First file is removed");
+
+  parts[TRANSLOG_INTERNAL_PARTS + 0].str= (char*)long_buffer;
+  parts[TRANSLOG_INTERNAL_PARTS + 0].length= LONG_BUFFER_SIZE;
+  if (translog_write_record(&lsn,
+			    LOGREC_VARIABLE_RECORD_0LSN_EXAMPLE,
+			    &dummy_transaction_object, NULL, LONG_BUFFER_SIZE,
+			    TRANSLOG_INTERNAL_PARTS + 1, parts, NULL))
+  {
+    fprintf(stderr, "Can't write variable record\n");
+    translog_destroy();
+    exit(1);
+  }
+
+  translog_purge(lsn);
+  if (!translog_is_file(2) || !translog_is_file(3))
+  {
+    fprintf(stderr, "Second file (%d) or third file (%d) is not present.\n",
+	    translog_is_file(2), translog_is_file(3));
+    translog_destroy();
+    exit(1);
+  }
+
+  ok(1, "Second and third files are not removed");
+
+  int4store(long_tr_id, 0);
+  parts[TRANSLOG_INTERNAL_PARTS + 0].str= (char*)long_tr_id;
+  parts[TRANSLOG_INTERNAL_PARTS + 0].length= 6;
+  if (translog_write_record(&lsn,
+                            LOGREC_FIXED_RECORD_0LSN_EXAMPLE,
+                            &dummy_transaction_object, NULL, 6,
+                            TRANSLOG_INTERNAL_PARTS + 1,
+                            parts, NULL))
+  {
+    fprintf(stderr, "Can't write last record\n");
+    translog_destroy();
+    exit(1);
+  }
+
+  translog_purge(lsn);
+  if (translog_is_file(2))
+  {
+    fprintf(stderr, "Second file is not removed\n");
+    translog_destroy();
+    exit(1);
+  }
+
+  ok(1, "Second file is removed");
+
+  translog_destroy();
+  end_pagecache(&pagecache, 1);
+  ma_control_file_end();
+  if (maria_log_remove())
+    exit(1);
+  exit(0);
+}